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聚乳酸/热塑性聚酯弹性体（PLA/TPEE）共混物的等温冷结晶、耐热性及拉伸性能：退火和反应性增容剂的影响

Isothermal Cold Crystallization, Heat Resistance, and Tensile Performance of Polylactide/Thermoplastic Polyester Elastomer (PLA/TPEE) Blends: Effects of Annealing and Reactive Compatibilizer.

作者信息

Wang Sisi, Pang Sujuan, Pan Lisha, Xu Nai, Li Tan

机构信息

College of Materials and Chemical Engineering, Hainan University, Haikou 570228, China.

Hainan Provincial Fine Chemical Engineering Research Center, Hainan University, Haikou 570228, China.

出版信息

Polymers (Basel). 2016 Dec 8;8(12):417. doi: 10.3390/polym8120417.

DOI:10.3390/polym8120417
PMID:30974700
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC6431975/
Abstract

The combined influences of crystallinity and reactive compatibilizer-a multifunctional epoxide (ADR)-on morphology, tensile performance, and heat resistance of polylactide/thermoplastic polyester elastomer (PLA/TPEE) (80/20) blends were investigated. Annealing involved an isothermal cold crystallization of PLA matrix was performed to increase crystallinity of the samples. First, isothermal cold crystallization kinetics were investigated using differential scanning calorimetry measurement. It was found that the addition of ADR decreased the crystallization rate of the samples. The maximum crystallinity of the annealed samples also decreased from 40% to 34% while ADR loading increased from zero to 1.0 phr. Furthermore, influence of crystallinity on mechanical performances of the PLA/TPEE sample was researched. The heat resistance of the sample showed a significant enhancement while increasing its crystallinity. Meanwhile, the tensile ductility of the crystallized PLA/TPEE sample became very poor due to the embrittlement with increased crystallinity and the incompatibility between PLA and TPEE. However, the annealed PLA/TPEE/ADR samples with high crystallinity kept a higher tensile ductility because ADR greatly improved the interfacial compatibility. Differences in tensile fracture behaviors of the quenched and annealed PLA/TPEE samples with and without ADR were discussed in detail. At last, crystallized PLA/TPEE/ADR blends with excellent heat resistance and high tensile ductility were obtained by annealing and reactive compatibilization.

摘要

研究了结晶度和反应性增容剂——一种多功能环氧化合物（ADR）——对聚乳酸/热塑性聚酯弹性体（PLA/TPEE）（80/20）共混物的形态、拉伸性能和耐热性的综合影响。退火过程包括对PLA基体进行等温冷结晶，以提高样品的结晶度。首先，使用差示扫描量热法测量研究了等温冷结晶动力学。发现添加ADR降低了样品的结晶速率。当ADR用量从零增加到1.0 phr时，退火样品的最大结晶度也从40%降至34%。此外，研究了结晶度对PLA/TPEE样品力学性能的影响。样品的耐热性随着结晶度的增加而显著提高。同时，由于结晶度增加导致脆化以及PLA和TPEE之间的不相容性，结晶后的PLA/TPEE样品的拉伸延展性变得很差。然而，具有高结晶度的退火PLA/TPEE/ADR样品保持了较高的拉伸延展性，因为ADR大大改善了界面相容性。详细讨论了有和没有ADR的淬火和退火PLA/TPEE样品在拉伸断裂行为上的差异。最后，通过退火和反应性增容获得了具有优异耐热性和高拉伸延展性的结晶PLA/TPEE/ADR共混物。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ee60/6431975/2006987f693c/polymers-08-00417-g009.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ee60/6431975/916fc884bb6c/polymers-08-00417-g001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ee60/6431975/2ed5a22551c3/polymers-08-00417-g002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ee60/6431975/29428ed2fbb0/polymers-08-00417-g003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ee60/6431975/480e9957e393/polymers-08-00417-g004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ee60/6431975/e4bee563f1b1/polymers-08-00417-g005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ee60/6431975/c8778a1f67bd/polymers-08-00417-g006.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ee60/6431975/ba6de7b65994/polymers-08-00417-g007.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ee60/6431975/c93ea0a3d18e/polymers-08-00417-g008.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ee60/6431975/2006987f693c/polymers-08-00417-g009.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ee60/6431975/916fc884bb6c/polymers-08-00417-g001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ee60/6431975/2ed5a22551c3/polymers-08-00417-g002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ee60/6431975/29428ed2fbb0/polymers-08-00417-g003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ee60/6431975/480e9957e393/polymers-08-00417-g004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ee60/6431975/e4bee563f1b1/polymers-08-00417-g005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ee60/6431975/c8778a1f67bd/polymers-08-00417-g006.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ee60/6431975/ba6de7b65994/polymers-08-00417-g007.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ee60/6431975/c93ea0a3d18e/polymers-08-00417-g008.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ee60/6431975/2006987f693c/polymers-08-00417-g009.jpg

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