聚酰胺66/改性耐热聚乳酸共混物的力学性能和结晶行为
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摘要
采用熔融共混和注射成型制备了改性耐热聚酰胺66/聚乳酸(PA66/PLA)共混物,经热处理后,探讨了PLA含量对共混物的断口样貌形态、力学性能以及结晶性能的影响。结果表明,PLA与PA66具有一定的相容性,当PLA的含量不超过10%(质量分数,下同)时,PA66/PLA共混物的拉伸强度在PA66的93%以上,其断裂伸长率对比PLA得到了倍数级的增长,是PLA断裂伸长率的8.6倍;当PLA的含量不超过20%时,共混物的结晶性能变好,提升结晶速率,缩短结晶时间,结晶度有所提高;但当PLA的含量超过20%以后,共混物的拉伸强度则出现了不同程度的降低。
A series of polyamide 66(PA66)/polylactic acid(PLA) blends with different contents of PLA were prepared by a melt-blending method. The effect of PLA content on the fracture morphology, mechanical properties and crystalline properties of the blends after heat treatment were investigated. The results indicated that PA66 was partially compatible with PLA, and the blends achieved an increase in tensile strength by 93 % compared to pure PA66 when the content of PLA is less than 10 wt%. On the other hand, their elongation at break increased by a factor of 8.6 compared to PLA. The crystallization rate of PA66 increased and its crystallization time was shortened when less than 20 wt% of PLA was incorporated, indicating an improved crystalline property. Moreover, the tensile strength of the blends decreased significantly when the PLA content exceeded 20 wt%.
A series of polyamide 66(PA66)/polylactic acid(PLA) blends with different contents of PLA were prepared by a melt-blending method. The effect of PLA content on the fracture morphology, mechanical properties and crystalline properties of the blends after heat treatment were investigated. The results indicated that PA66 was partially compatible with PLA, and the blends achieved an increase in tensile strength by 93 % compared to pure PA66 when the content of PLA is less than 10 wt%. On the other hand, their elongation at break increased by a factor of 8.6 compared to PLA. The crystallization rate of PA66 increased and its crystallization time was shortened when less than 20 wt% of PLA was incorporated, indicating an improved crystalline property. Moreover, the tensile strength of the blends decreased significantly when the PLA content exceeded 20 wt%.
引文
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[3] 雷雁洲,王少伟,吕秦牛,等.碳纤维/聚乳酸共混物的结晶性能和流变特性[J].共混物学报, 2018, 35(6):1 402-1 406. LEI Y Z,WANG S W,LYU Q N, et al. Crystallization and Rheological Properties of Carbon Fiber/Poly (lactic acid) Composites[J].AMCS,2018, 35(6):1 402-1 406.
[4] 郑霞,李新功.竹纤维/聚乳酸可生物降解共混物自然降解性能[J].共混物学报,2014,31(2):362-367. ZHENG X, LI X G. Natural Degradation Properties of Bamboo Fibers/Polylactic Acid Biodegradable Composites[J].AMCS,2014,31(2):362-367.
[5] 王玉领,李海,代坤,等.尼龙6/聚乳酸共混物的结构及性能[J].高分子材料科学与工程,2010,26(3)61-64. WANG Y L, LI H, DAI K, et al. Structure and Properties of PA6/PLA Blends[J].Polymer Materials Science and Engineering,2010,26(3):61-64.
[6] 廖黎琼,付一政,梁晓艳,等.分子动力学模拟研究聚乳酸/聚酰胺11共混物的相容性[J].分子科学学报,2012,28(6):506-511. LIAO L Q, FU Y Z, LIANG X Y, et al. Molecular Dynamics Simulations for Miscibility of PLA/PA11 Blends[J].Journal of Molecular Science,2012,28(6):506-511.
[7] 宋剑斌,张文研.PLA/PA1212共混物结构与力学性能研究[J].塑料工业,2011,39(12)19-21. SONG J B, ZHANG W Y. Study on Structure and Mechanical Properties of PLA/PA1212 Blends[J].China Plastic Industry,2011,39(12):19-21.
[8] CAILLOUX J, ABT T, GARCIA-MASABET V, et al. Effect of the Viscosity Ratio on the PLA/PA10.10 Bioblends Morphology and Mechanical Properties[J].Express Polymer Letters,2018,12(6):569-582.
[9] 谭珏,文江福.尼龙66/聚酚氧树脂共混体系的相容性[J].高分子材料科学与工程,2017(12):42-47. TAN J, WEN J F. Compatibility of Polyamide 66/Phenoxy Blending System[J]. Polymer Materials Science & Engineering,2017,33(22):42-47.
[10] 刘斌.生物基材料发展态势[J].生物产业技术,2014(4):13-16. LIU B. Bio-based Materials Development Trend[J]. Biotechnology & Business,2014(4):13-16.
[11] ABDELWAHABAB M A,CHIOU B S,LMAM S, et al. Thermal,Mechanical and Morphological Characterization of Plasticized PLA-PHB Blends[J].Polymer Degradation & Stability,2012,97(9):1 822-1 828.
[12] AKAMPUMUZA O,WAMBUA P M,AHMED A,et al. Review of the Applications of Bioblends in the Automotive Industry[J].Polymer Blends,2017,38(11).
[13] 中国国家标准化管理委员会.塑料拉伸性能的测定:GB/T 1040.1—2006[S].北京:中国标准出版社,2006.
[14] 吴爽,刘伟,王青松,等.滑石粉粒径对聚乳酸的结晶行为和力学性能研究[J].塑料包装,2012(4):10-14. WU S,LIU W,WANG Q S, et al. Crystallization Beha-vior and Mechanical Properties of Poly(lactic acid)/Talc Systems[J].Plastics Packaging,2012(4):10-14
[15] 张敏,崔春娜,黄继涛,等.抑制聚乳酸热老化的研究[J].塑料,2009,38(4):85-87. ZHANG M,CUI C N,HUANG J T,et al. Thermal Aging Restrain of PLLA[J].Plastics,2009,38(4):85-87
[16] GARLOTTA D. A Literature Review of Poly(lactic aid)[J].Journal of Polymers & the Environment,2001,9(2):63-84.
[17] 韩丽丽.聚乳酸/尼龙合金的制备及其形变机理研究[D]. 青岛:青岛科技大学,2014.