水辅助注射成型制品质量的缺陷及工艺优化研究概述
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摘要
针对水辅助注射制品的质量,从宏观现象(如高压水的第一次穿透过程不稳定性、模具型腔变截面处的熔体堆积现象、制品成型过程中的指状效应)和微观现象(沿制品厚度方向的纤维取向及分布、不同区域的晶体类型及结构)以及其相对应的相关工艺优化进行了综述。
Aimed to the quality of water-assisted injection molded parts, this paper presented a survey for their defects and relevant process optimization from the macroscopic phenomena such as the first penetration process of high-pressure water instability, the phenomenon of melt accumulation at the mold cavity variable cross section, the formation of water fingerings during the process and the microscopic phenomena like fiber orientation and distribution along the thickness of the parts, and crystal types and structures in different regions.
Aimed to the quality of water-assisted injection molded parts, this paper presented a survey for their defects and relevant process optimization from the macroscopic phenomena such as the first penetration process of high-pressure water instability, the phenomenon of melt accumulation at the mold cavity variable cross section, the formation of water fingerings during the process and the microscopic phenomena like fiber orientation and distribution along the thickness of the parts, and crystal types and structures in different regions.
引文
[1]SHAH S,HLAVATY D.Gas Injection Molding of an Automotive Structural Part[J].Plastics Engineering,1991,199(1):21-25.
[2]YANG S Y,CHOU H L.Study on the Residual Wall Thickness at Dimensional Transitions and Curved Sections in Gas-assisted Molded Circular Tubes[J].Polymer Engineering&Science,2002,42(1):111-119.
[3]PARVEZ M A,ONG N S,LAM Y C,et al.Gas-assisted Injection Molding:The Effects of Process Variables and Gas Channel Geometry[J].Journal of Materials Processing Technology,2002,121(1):27-35.
[4]LIU S J,CHANG K H.Parameters Affecting the Fullshot Molding of Gas-assisted Injection Molded Parts[J].Advances in Polymer Technology,2003,22(1):1-14.
[5]KNIGHTS M.Water Injection Molding Makes Hollow Parts Faster,Lighter[J].Plastics Technology,2002,48(4):62-67.
[6]THOMAS R Process for Gas Assisted and Water Assisted Injection Molding:6,579,489[P].2003-06-17.
[7]KNIGHTS M.Water Injection Molding:It's All Coming Together[J].Plastics Technology,2005,51(9):54-61.
[8]LIU S J,LIN C H.An Experimental Study of Water-assisted Injection Molding of Plastic Tubes with Dimensional Transitions[J].Journal of Reinforced Plastics and Composites,2007,26(14):1 441-1 454.
[9]MICHAELI W,JUNTGEN T,BRUNSWICK A.WITEn Route to Series Production:First Industrial Application of the Water Injection Technique[J].Kunststoffe Plast Europe,2001,91(3):37-39.
[10]LIU S,CHEN Y.Water-assisted Injection Molding of Thermoplastic Materials:Effects of Processing Parameters[J].Polymer Engineering&Science,2003,43(11):1 806-1 817.
[11]CHANG R Y,HUANG C T,YANG W H,et al.The Investigation of Flow Behavior of Polymeric Melts in the Water Assisted Injection Molding[C]//Proceedings of the 62nd Annual Technical Conference of SPE,May 16-20,2004,Chicago,IL,USA,Brookfield:SPE/AN-TEC,2004:566-569.
[12]LIU S J,WU Y C.A Novel High Flow Rate Pin for Water-assisted Injection Molding of Plastic Parts with a More Uniform Residual Wall Thickness Distribution[J].International Polymer Processing,2006,21(5):436-439.
[13]LIU S J,WU Y C,CHENG W K.Surface Gloss Difference on Water Assisted Injection Moulded Thermoplastic Parts:Effects of Processing Variables[J].Plastics,Rubber and Composites,2006,35(1):29-36.
[14]AHMADZAI A Z,BEHRAVESH A H.An Experimental Investigation on Water Penetration in the Process of Water Assisted Injection Molding of Polypropylene[J].Polimery,2009,54:564-572.
[15]LIU S J.Water Assisted Injection Molding:a Review[J].International Polymer Processing,2009,24(4):315-325.
[16]MICHAELI W,Brunswick A,Kujat C.Reducing Cooling Time with Water-assisted Injection Moulding-advantages Over Gas-assisted Injection[J].Kunststoffe-Plast Eupope,2000,90(8):67-72.
[17]MAPLESTON P.Injection Molding Water-assisted Process Shows Promise[J].Modern Plastics International,2001,31(1):33-33.
[18]LIU S J,CHEN W K.Experimental Investigation and Numerical Simulation of Cooling Process in Water Assisted Injection Moulded Parts[J].Plastics,Rubber and Composites,2004,33(6):260-266.
[19]YANG J G,ZHOU X H,NIU Q.Residual Wall Thickness Study of Variable Cross-section Tube in Water-assisted Injection Molding[J].International Polymer Processing,2012,27(5):584-590.
[20]SANNEN S,PUYVELDE P,KEYZER J.Defect Occurrence in Water-assisted Injection-molded Products:Definition and Responsible Formation Mechanisms[J].Advances in Polymer Technology,2015,34(1),21476,DOI:10.1002/adv.21476.
[21]PARK H,CHA B S,RHEE B.Experimental and Numerical Investigation of the Effect of Process Conditions on Residual Wall Thickness and Cooling and Surface Characteristics of Water-assisted Injection Molded Hollow Products[J].Advances in Materials Science and Engineering,2015,161938,DOI:10.1155/2015/701940.
[22]WU Y C,LIU S J.Flow Visualization of Water Assisted Injection Moulding Process[J].Plastics,Rubber and Composites,2005,34(5/6):227-231.
[23]LIU S J,WU Y C,LAI P C.Water Penetration Stability in Water Assisted Injection Molded Symmetric Ribs[J].International Polymer Processing,2005,20(4):352-359.
[24]LIU S J,WU Y C.Dynamic Visualization of Cavity-fil-ing Process in Fluid-assisted Injection Molding-gas Versus Water[J].Polymer Testing,2007,26(2):232-242.
[25]张增猛,周华,高院安,等.水辅助注射成型充模流动的仿真与分析[J].机械工程学报,2010,46(8):140-146.ZHANG Z M,ZHOU H,GAO Y A,et al.Simulation Simulation and Analysis on Cavity Filling Process in Water-assisted Injection Molding[J].Journal of Mechanical Engineering,2010(8):140-146.
[26]刘旭辉,黄汉雄.水辅助注射成型中水穿透行为的可视化研究[J].中国塑料,2009,23(3):58-60.LIU X H,HUANG H X.Visualization Analysis of Water Penetration Behavior in Water-assisted Injection Molding[J].China Plastics,2009,23(3):58-60.
[27]刘旭辉,黄汉雄.水辅助熔体充模流动的熔体流痕[J].化工学报,2010,61(10):2 523-2 528.LIU X H,HUANG H X.Melt Flow Patterns in Waterassisted Melt Filling[J].CIESC Journal,2010,61(10):2523-2 528.
[28]刘旭辉,黄汉雄.工艺参数对水辅助熔体充模流动的影响[J].化工学报,2011,62(2):520-524.LIU X H,HUANG H X.Effects of Processing Conditions on Melt Flow of Water Assisted Melt Filling[J].CIESC Journal,2011,62(2):520-524.
[29]匡唐清,邓洋,余春丛.溢流法水辅注塑中注水参数对水穿透的影响分析[J].中国塑料,2014,28(7):96-99.KUANG T Q,DENG Y,YU C C.Experimental Investigation of the Effect of Water Parameters on Water Penetration During Overflow Water-assisted Injection Molding[J].China Plastics,2014,28(7):96-99.
[30]匡唐清,邓洋.注水参数对水辅助注射成型充填过程影响的数值模拟[J].中国塑料,2014,28(2):96-100.KUANG T Q,DENG Y.Numerical Simulation of Effect of Water Injection Parameters on Water-assisted Injection Molding Filling Process[J].China Plastics,2014,28(2):96-100.
[31]LIU S J,CHEN Y S.The Manufacturing of Thermoplastic Composite Parts by Water-assisted Injection-molding Technology[J].Composites Part A:Applied Science and Manufacturing,2004,35(2):171-180.
[32]YANG J G,ZHOU X H.Numerical Simulation on Residual Wall Thickness of Tubes with Dimensional Transitions and Curved Sections in Water-assisted Injection Molding[J].Journal of Applied Polymer Science,2013,128(3):1 987-1 994.
[33]LIU S J,HSIEH M H.Residual Wall Thickness Distribution at the Transition and Curve Sections of Water-assisted Injection Molded Tubes[J].International Polymer Processing,2007,22(1):82-89.
[34]LIU S J,LIN S P.Study of'Fingering'in Water Assisted Injection Molded Composites[J].Composites Part A:Applied Science and Manufacturing,2005,36(11):1 507-1 517.
[35]LIU S J,LIN S P.Factors Affecting the Formation of Fingering in Water-assisted Injection-molded Thermoplastics[J].Advances in Polymer Technology,2006,25(2):98-108.
[36]LIN K Y,LIU S J.The Influence of Processing Parameters on Fingering Formation in Fluid-assisted Injectionmolded Disks[J].Polymer Engineering&Science,2009,49(11):2 257-2 263.
[37]SANNEN S,DE KEYZER J,VAN PUYVELDE P.The Influence of Melt and Process Parameters on the Quality and Occurrence of Part Defects in Water-assisted Injection Molded Tubes[J].International Polymer Processing,2011,26(5):551-559.
[38]YANG J G,ZHOU X H,NIU Q.Model and Simulation of Water Penetration in Water-assisted Injection Molding[J].The International Journal of Advanced Manufacturing Technology,2013,67(1/2/3/4):367-375.
[39]水辅技术首次应用于碳纤维加工[J].玻璃钢/复合材料,2015(1):117.Water-assisted Technology First Applied to Carbon Fiber Processing[J].Fiber Reinforced Plastics/Composites,2015(1):117.
[40]中国全碳纤车体新能源汽车e-Go登录美国[J].玻璃钢/复合材料,2015(1):117.China's Full Carbon Fiber Car Body New Energy Vehicle e-Go Log In United States[J].Fiber Reinforced Plastics/Composites,2015(1):117.
[41]LIU S J,LIN M J,WU Y C.An Experimental Study of the Water-assisted Injection Molding of Glass Fiber Filled Poly-butylene-terephthalate(PBT)Composites[J].Composites Science and Technology,2007,67(7).
[42]HUANG H X,ZHOU R H,YANG C.Fiber Orientation Propelled by High-pressure Water Penetration in Water-assisted Injection Molded Fiber-reinforced Thermoplastics Part[J].Journal of Composite Materials,2013,47(2):183-190.
[43]LIU S J,SHIH C C.An Experimental Study of the Water-assisted Injection Molding of PA-6 Composites[J].Journal of Reinforced Plastics and Composites,2008,27(9):985-999.
[44]HUANG H X,DENG Z W.Effects and Optimization of Processing Parameters in Water-assisted Injection Molding[J].Journal of Applied Polymer Science,2008,108(1):228-235.
[45]周伟文,黄汉雄.水辅助注塑尼龙6制品的结晶行为研究[J].塑料科技,2010,38(1):66-69.ZHOU W W,HUANG H X.Study on Crystallization Behavior of Water-assisted Injection Moulded Nylon 6 Part[J].Plastics Science and Technology,2010,38(1):66-69.
[46]许磊,黄汉雄,周润恒.水辅助注塑聚丙烯制品的晶体结构研究[J].塑料科技,2009,37(6):39-42.XU L,HUANG H X,ZHOU R H.Study on Crystal Structure of Water-assisted Injection Molded Polypropylene Part[J].Plastics Science and Technology,2009,37(6):39-42.
[47]LIU X,ZHENG G,DAI K,et al.Morphological Comparison of Isotactic Polypropylene Molded by Water-assisted and Conventional Injection Molding[J].Journal of Materials Science,2011,46(24):7 830.
[48]WANG B,HUANG H X.Tailoring the Crystalline Structure of Polypropylene Parts Molded Through Waterassisted Injection Molding:Effects of Melt Temperature and Polymeric Nucleating Agent[J].Polymer Engineering Science,2013,53(9):1 927-1 936.
[49]WANG B,HUANG H X,WANG Z Y.In Situ Fibrillation of Polymeric Nucleating Agents in Polypropylene and Subsequent Transcrystallization Propelled by High-pressure Water Penetration During Water-assisted Injection Molding[J].Composites Part B:Engineering,2013,50(8):215-223.
[50]ZHENG G Q,JIA Z,LIU X,et al.Enhanced Orientation of the Water-assisted Injection Molded IPP in the Presence of Nucleating Agent[J].Polymer Engineering&Science,2012,52(4):725-732.
[51]WANG B,HUANG H X,WANG Z Y.Process-induced Phase and Crystal Morphologies in Water-assisted Injection Molded Polypropylene/Polymericβ-nucleating Agent Blend Parts[J].Polymer Engineering&Science,2015,55(7):1 698-1 705.
[52]LIU X,ZHANG C,DAI K,et al.Unexpected Molecular Weight Dependence of Shish Kebab in Water-assisted Injection Molded HDPE[J].Polymers for Advanced Technologies,2013,24(2):270-272.
[2]YANG S Y,CHOU H L.Study on the Residual Wall Thickness at Dimensional Transitions and Curved Sections in Gas-assisted Molded Circular Tubes[J].Polymer Engineering&Science,2002,42(1):111-119.
[3]PARVEZ M A,ONG N S,LAM Y C,et al.Gas-assisted Injection Molding:The Effects of Process Variables and Gas Channel Geometry[J].Journal of Materials Processing Technology,2002,121(1):27-35.
[4]LIU S J,CHANG K H.Parameters Affecting the Fullshot Molding of Gas-assisted Injection Molded Parts[J].Advances in Polymer Technology,2003,22(1):1-14.
[5]KNIGHTS M.Water Injection Molding Makes Hollow Parts Faster,Lighter[J].Plastics Technology,2002,48(4):62-67.
[6]THOMAS R Process for Gas Assisted and Water Assisted Injection Molding:6,579,489[P].2003-06-17.
[7]KNIGHTS M.Water Injection Molding:It's All Coming Together[J].Plastics Technology,2005,51(9):54-61.
[8]LIU S J,LIN C H.An Experimental Study of Water-assisted Injection Molding of Plastic Tubes with Dimensional Transitions[J].Journal of Reinforced Plastics and Composites,2007,26(14):1 441-1 454.
[9]MICHAELI W,JUNTGEN T,BRUNSWICK A.WITEn Route to Series Production:First Industrial Application of the Water Injection Technique[J].Kunststoffe Plast Europe,2001,91(3):37-39.
[10]LIU S,CHEN Y.Water-assisted Injection Molding of Thermoplastic Materials:Effects of Processing Parameters[J].Polymer Engineering&Science,2003,43(11):1 806-1 817.
[11]CHANG R Y,HUANG C T,YANG W H,et al.The Investigation of Flow Behavior of Polymeric Melts in the Water Assisted Injection Molding[C]//Proceedings of the 62nd Annual Technical Conference of SPE,May 16-20,2004,Chicago,IL,USA,Brookfield:SPE/AN-TEC,2004:566-569.
[12]LIU S J,WU Y C.A Novel High Flow Rate Pin for Water-assisted Injection Molding of Plastic Parts with a More Uniform Residual Wall Thickness Distribution[J].International Polymer Processing,2006,21(5):436-439.
[13]LIU S J,WU Y C,CHENG W K.Surface Gloss Difference on Water Assisted Injection Moulded Thermoplastic Parts:Effects of Processing Variables[J].Plastics,Rubber and Composites,2006,35(1):29-36.
[14]AHMADZAI A Z,BEHRAVESH A H.An Experimental Investigation on Water Penetration in the Process of Water Assisted Injection Molding of Polypropylene[J].Polimery,2009,54:564-572.
[15]LIU S J.Water Assisted Injection Molding:a Review[J].International Polymer Processing,2009,24(4):315-325.
[16]MICHAELI W,Brunswick A,Kujat C.Reducing Cooling Time with Water-assisted Injection Moulding-advantages Over Gas-assisted Injection[J].Kunststoffe-Plast Eupope,2000,90(8):67-72.
[17]MAPLESTON P.Injection Molding Water-assisted Process Shows Promise[J].Modern Plastics International,2001,31(1):33-33.
[18]LIU S J,CHEN W K.Experimental Investigation and Numerical Simulation of Cooling Process in Water Assisted Injection Moulded Parts[J].Plastics,Rubber and Composites,2004,33(6):260-266.
[19]YANG J G,ZHOU X H,NIU Q.Residual Wall Thickness Study of Variable Cross-section Tube in Water-assisted Injection Molding[J].International Polymer Processing,2012,27(5):584-590.
[20]SANNEN S,PUYVELDE P,KEYZER J.Defect Occurrence in Water-assisted Injection-molded Products:Definition and Responsible Formation Mechanisms[J].Advances in Polymer Technology,2015,34(1),21476,DOI:10.1002/adv.21476.
[21]PARK H,CHA B S,RHEE B.Experimental and Numerical Investigation of the Effect of Process Conditions on Residual Wall Thickness and Cooling and Surface Characteristics of Water-assisted Injection Molded Hollow Products[J].Advances in Materials Science and Engineering,2015,161938,DOI:10.1155/2015/701940.
[22]WU Y C,LIU S J.Flow Visualization of Water Assisted Injection Moulding Process[J].Plastics,Rubber and Composites,2005,34(5/6):227-231.
[23]LIU S J,WU Y C,LAI P C.Water Penetration Stability in Water Assisted Injection Molded Symmetric Ribs[J].International Polymer Processing,2005,20(4):352-359.
[24]LIU S J,WU Y C.Dynamic Visualization of Cavity-fil-ing Process in Fluid-assisted Injection Molding-gas Versus Water[J].Polymer Testing,2007,26(2):232-242.
[25]张增猛,周华,高院安,等.水辅助注射成型充模流动的仿真与分析[J].机械工程学报,2010,46(8):140-146.ZHANG Z M,ZHOU H,GAO Y A,et al.Simulation Simulation and Analysis on Cavity Filling Process in Water-assisted Injection Molding[J].Journal of Mechanical Engineering,2010(8):140-146.
[26]刘旭辉,黄汉雄.水辅助注射成型中水穿透行为的可视化研究[J].中国塑料,2009,23(3):58-60.LIU X H,HUANG H X.Visualization Analysis of Water Penetration Behavior in Water-assisted Injection Molding[J].China Plastics,2009,23(3):58-60.
[27]刘旭辉,黄汉雄.水辅助熔体充模流动的熔体流痕[J].化工学报,2010,61(10):2 523-2 528.LIU X H,HUANG H X.Melt Flow Patterns in Waterassisted Melt Filling[J].CIESC Journal,2010,61(10):2523-2 528.
[28]刘旭辉,黄汉雄.工艺参数对水辅助熔体充模流动的影响[J].化工学报,2011,62(2):520-524.LIU X H,HUANG H X.Effects of Processing Conditions on Melt Flow of Water Assisted Melt Filling[J].CIESC Journal,2011,62(2):520-524.
[29]匡唐清,邓洋,余春丛.溢流法水辅注塑中注水参数对水穿透的影响分析[J].中国塑料,2014,28(7):96-99.KUANG T Q,DENG Y,YU C C.Experimental Investigation of the Effect of Water Parameters on Water Penetration During Overflow Water-assisted Injection Molding[J].China Plastics,2014,28(7):96-99.
[30]匡唐清,邓洋.注水参数对水辅助注射成型充填过程影响的数值模拟[J].中国塑料,2014,28(2):96-100.KUANG T Q,DENG Y.Numerical Simulation of Effect of Water Injection Parameters on Water-assisted Injection Molding Filling Process[J].China Plastics,2014,28(2):96-100.
[31]LIU S J,CHEN Y S.The Manufacturing of Thermoplastic Composite Parts by Water-assisted Injection-molding Technology[J].Composites Part A:Applied Science and Manufacturing,2004,35(2):171-180.
[32]YANG J G,ZHOU X H.Numerical Simulation on Residual Wall Thickness of Tubes with Dimensional Transitions and Curved Sections in Water-assisted Injection Molding[J].Journal of Applied Polymer Science,2013,128(3):1 987-1 994.
[33]LIU S J,HSIEH M H.Residual Wall Thickness Distribution at the Transition and Curve Sections of Water-assisted Injection Molded Tubes[J].International Polymer Processing,2007,22(1):82-89.
[34]LIU S J,LIN S P.Study of'Fingering'in Water Assisted Injection Molded Composites[J].Composites Part A:Applied Science and Manufacturing,2005,36(11):1 507-1 517.
[35]LIU S J,LIN S P.Factors Affecting the Formation of Fingering in Water-assisted Injection-molded Thermoplastics[J].Advances in Polymer Technology,2006,25(2):98-108.
[36]LIN K Y,LIU S J.The Influence of Processing Parameters on Fingering Formation in Fluid-assisted Injectionmolded Disks[J].Polymer Engineering&Science,2009,49(11):2 257-2 263.
[37]SANNEN S,DE KEYZER J,VAN PUYVELDE P.The Influence of Melt and Process Parameters on the Quality and Occurrence of Part Defects in Water-assisted Injection Molded Tubes[J].International Polymer Processing,2011,26(5):551-559.
[38]YANG J G,ZHOU X H,NIU Q.Model and Simulation of Water Penetration in Water-assisted Injection Molding[J].The International Journal of Advanced Manufacturing Technology,2013,67(1/2/3/4):367-375.
[39]水辅技术首次应用于碳纤维加工[J].玻璃钢/复合材料,2015(1):117.Water-assisted Technology First Applied to Carbon Fiber Processing[J].Fiber Reinforced Plastics/Composites,2015(1):117.
[40]中国全碳纤车体新能源汽车e-Go登录美国[J].玻璃钢/复合材料,2015(1):117.China's Full Carbon Fiber Car Body New Energy Vehicle e-Go Log In United States[J].Fiber Reinforced Plastics/Composites,2015(1):117.
[41]LIU S J,LIN M J,WU Y C.An Experimental Study of the Water-assisted Injection Molding of Glass Fiber Filled Poly-butylene-terephthalate(PBT)Composites[J].Composites Science and Technology,2007,67(7).
[42]HUANG H X,ZHOU R H,YANG C.Fiber Orientation Propelled by High-pressure Water Penetration in Water-assisted Injection Molded Fiber-reinforced Thermoplastics Part[J].Journal of Composite Materials,2013,47(2):183-190.
[43]LIU S J,SHIH C C.An Experimental Study of the Water-assisted Injection Molding of PA-6 Composites[J].Journal of Reinforced Plastics and Composites,2008,27(9):985-999.
[44]HUANG H X,DENG Z W.Effects and Optimization of Processing Parameters in Water-assisted Injection Molding[J].Journal of Applied Polymer Science,2008,108(1):228-235.
[45]周伟文,黄汉雄.水辅助注塑尼龙6制品的结晶行为研究[J].塑料科技,2010,38(1):66-69.ZHOU W W,HUANG H X.Study on Crystallization Behavior of Water-assisted Injection Moulded Nylon 6 Part[J].Plastics Science and Technology,2010,38(1):66-69.
[46]许磊,黄汉雄,周润恒.水辅助注塑聚丙烯制品的晶体结构研究[J].塑料科技,2009,37(6):39-42.XU L,HUANG H X,ZHOU R H.Study on Crystal Structure of Water-assisted Injection Molded Polypropylene Part[J].Plastics Science and Technology,2009,37(6):39-42.
[47]LIU X,ZHENG G,DAI K,et al.Morphological Comparison of Isotactic Polypropylene Molded by Water-assisted and Conventional Injection Molding[J].Journal of Materials Science,2011,46(24):7 830.
[48]WANG B,HUANG H X.Tailoring the Crystalline Structure of Polypropylene Parts Molded Through Waterassisted Injection Molding:Effects of Melt Temperature and Polymeric Nucleating Agent[J].Polymer Engineering Science,2013,53(9):1 927-1 936.
[49]WANG B,HUANG H X,WANG Z Y.In Situ Fibrillation of Polymeric Nucleating Agents in Polypropylene and Subsequent Transcrystallization Propelled by High-pressure Water Penetration During Water-assisted Injection Molding[J].Composites Part B:Engineering,2013,50(8):215-223.
[50]ZHENG G Q,JIA Z,LIU X,et al.Enhanced Orientation of the Water-assisted Injection Molded IPP in the Presence of Nucleating Agent[J].Polymer Engineering&Science,2012,52(4):725-732.
[51]WANG B,HUANG H X,WANG Z Y.Process-induced Phase and Crystal Morphologies in Water-assisted Injection Molded Polypropylene/Polymericβ-nucleating Agent Blend Parts[J].Polymer Engineering&Science,2015,55(7):1 698-1 705.
[52]LIU X,ZHANG C,DAI K,et al.Unexpected Molecular Weight Dependence of Shish Kebab in Water-assisted Injection Molded HDPE[J].Polymers for Advanced Technologies,2013,24(2):270-272.