退火工艺对PP–R复合材料性能的影响
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摘要
通过注塑工艺制备无规共聚聚丙烯(PP–R)样条,并将样条置于热处理设备进行退火处理。运用差示扫描量热仪、广角X射线衍射仪、偏光显微镜和扫描电子显微镜等方法,分析了退火对PP–R的结晶行为和力学性能的影响。结果表明,退火可以消除热应力,促进结晶的完善,使得PP–R的结晶度从41.2%提高到48.4%,诱导β晶的生成,能有效改善材料的力学性能。退火使得PP–R的拉伸强度有所提高;对冲击性能影响明显,在25℃时,PP–R的冲击强度从41.67 k J/m2提高到66.84 k J/m2,提高了60.4%;在0℃时,PP–R的冲击强度从11.54 k J/m2提高到32.68 k J/m2,提高了1.8倍。
Random copolymer polypropylene(PP–R) sample was prepared by injection molding process. The samples were put into heat treatment equipment for annealing treatment. The effects of annealing treatment on crystallization behavior and mechanical properties of PP–R were analyzed by differential scanning calorimetry,wide-angle X ray diffraction,polarizing optical microscope and scanning electron microscope. The results show that annealing can eliminate thermal stress and promote crystallization,making crystallization of PP–R increased form 41.2% to 48.4% to induce β crystals forming,thus can effectively improve the mechanical properties of PP–R. Annealing makes tensile strength of PP–R increase. Annealing has a great influence on impact strength of PP–R,which increases from 41.67 k J/m2 to 66.84 k J/m2 going by 60.4% at 25 ℃ and increases from 11.54 k J/m2 to 32.68 k J/m2 going 1.8 times at 0℃.
Random copolymer polypropylene(PP–R) sample was prepared by injection molding process. The samples were put into heat treatment equipment for annealing treatment. The effects of annealing treatment on crystallization behavior and mechanical properties of PP–R were analyzed by differential scanning calorimetry,wide-angle X ray diffraction,polarizing optical microscope and scanning electron microscope. The results show that annealing can eliminate thermal stress and promote crystallization,making crystallization of PP–R increased form 41.2% to 48.4% to induce β crystals forming,thus can effectively improve the mechanical properties of PP–R. Annealing makes tensile strength of PP–R increase. Annealing has a great influence on impact strength of PP–R,which increases from 41.67 k J/m2 to 66.84 k J/m2 going by 60.4% at 25 ℃ and increases from 11.54 k J/m2 to 32.68 k J/m2 going 1.8 times at 0℃.
引文
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[2]Gahleitner M,Grein C,Kheirandish S,et al.Nucleation of polypropylene homo-and co-and co-polymers[J].International Polymer Processing,2011,28(1):2-20.
[3]赵桂艳,王颖,门永峰,等.剪切对玻璃珠填充聚丙烯结晶行为的影响[J].高等学校化学学报,2008,29(4):842-846.Zhao Guiyan,Wang Ying,Men Yongfeng,et al.Effect of shear on the crystallization behavior of glass bead fi lled polyproplyene[J].Chemical Research in Chinese Universities,2008,29(4):842-846.
[4]李美,章自寿,谭韵红,等.无规共聚聚丙烯中β晶的增韧作用[J].中山大学学报(自然科学版),2015,54(5):62-68.Li Mei,Zhang Zishou,Tan Yunhong,et al.The toughening effect ofβ-crystal in the random copolymer[J].Cata Scientiarum Naturalium Universitatis Sunyatseni,2015,54(5):62-68.
[5]胡帅领,白时兵,王琪,等,玻纤增强共聚聚丙烯高性能化的研究[J].塑料工业,2015,39(3):56-63.Hu Shuailing,Bai Shibing,Wang Qi,et al.Study on high performan-ce of glass fiber reinforced PP copolymer[J].China Plastics Industry,2015,39(3):56-63.
[6]祝宝东,张爽,朱泓宇,等.β成核剂含量和退火处理对改性聚丙烯力学性能的影响[J].中国塑料,2015,29(4):93-97.Zhu Baodong,Zhang Shuang,Zhu Hongyu,et al.Effects ofβnucleating agent content and annealing treatment on mechanical properties of modified polypropylene[J].China Plastics,2015,29(4):93-97.
[7]张玲,胡雄伟,盛旭敏,等.新型热塑性弹性体增韧聚丙烯的研究[J].塑料,2001,30(1):53-56.Zhang Ling,Hu Xiongwei,Sheng Xumin,et al.Research on a new thermoplastic elastomer toughening polypropylene[J].Plastics,2001,30(1):53-56.
[8]焦旗,田广华,杨坚,等.聚丙烯结晶性能研究[J].工程塑料应用,2015,43(7):109-113.Jiao Qi,Tian Guanghua,Yang Jian,et al.Study on crystallization properties of polypropylene[J].Engineering Plastics Application,2015,43(7):109-113.
[9]张世鑫,王益龙,何昌平.挤出工艺条件对β成核剂改性PP-R的影响[J].合成树脂及塑料,2015,32(1):1-5.Zhang Shixin,Wang Yilong,He Changping.Effect of extrusion process on the modifi cation of PP-R byβnucleating agent[J].China Synthetic Resin and Plastics,2015,32(1):1-5.
[10]王潇梦,尹晓刚,刘卫,等.PP-R管材专用料抗低温性能的研究[J].工程塑料应用,2015,43(2):20-25.Wang Xiaomeng,Yin Xiaogang,Liu Wei,et al.Study on lowtemperature crack resistance of PP-R pipe composite materials[J].Engineering Plastics Application,2015,43(2):20-25.
[11]付一政,安峰,曲静波,等.β晶型成核剂增韧改性聚丙烯及其共混物的力学性能与结晶行为[J].高分子材料科学与工程,2006,22(2):185-188.Fu Yizheng,An Feng,Qu Jingbo,et al.The mechanical properties and crystallization behavior of the modified PP and its blends modifi ed by beta nucleating agent[J].Polymer Materials Science and Engineering,2006,22(2):185-188.
[12]Grein C,Germain Y.Infl unence ofβ-nucleation on the mechanical properties of isotactic polypropylene and rubber modifi ed isotactic polypropylene[J].Polymer,2002,43:3 279-3 293.
[13]祝宝东,王鉴,董维超,等.氧化聚丙烯的存储与接枝研究[J].高校化学工程学报,2012,26(6):1 043-1 047.Zhu Baodong,Wang Jian,Dong Weichao,et al.Storage and slid-phase grafting of oxidized polypropylene oxide[J].Journal of Chemical Engineering of Chinese Universities,2012,26(6):1 043-1 047.