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两种橡胶增韧聚乳酸基共混物裂纹尖端周围损伤机制分析

Analysis of the Damage Mechanism around the Crack Tip for Two Rubber-Toughened PLA-Based Blends.

作者信息

Gigante Vito, Bosi Luca, Parlanti Paola, Gemmi Mauro, Aliotta Laura, Lazzeri Andrea

机构信息

Department of Civil and Industrial Engineering, University of Pisa, Via Diotisalvi, 2, 56122 Pisa, Italy.

Interuniversity National Consortium of Materials Science and Technology (INSTM), Via Giusti 9, 50121 Florence, Italy.

出版信息

Polymers (Basel). 2021 Nov 22;13(22):4053. doi: 10.3390/polym13224053.

DOI:10.3390/polym13224053
PMID:34833352
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC8625029/
Abstract

The toughening mechanisms of poly(lactic acid; PLA) blended with two different elastomers, namely poly (butylene adipate-co-terephtalate; PBAT) and polyolefin elastomers with grafted glycidyl methacrylate (POE-g-GMA), at 10 and 20 wt.%, were investigated. Tensile and Charpy impact tests showed a general improvement in the performance of the PLA. The morphology of the dispersed phases showed that PBAT is in the form of spheres while POE-g-GMA has a dual sphere/fibre morphology. To correlate the micromechanical deformation mechanism with the macroscopical mechanical behaviour, the analysis of the subcritical crack tip damaged zone of double-notched specimens subjected to a four-point bending test (according to the single-edge double-notch four-point bend (SEDN-4PB) technique) was carried out using several microscopic techniques (SEM, polarized TOM and TEM). The damage was mainly generated by shear yielding deformation although voids associated with dilatational bands were observed.

摘要

研究了聚乳酸（PLA）与两种不同弹性体，即聚（己二酸丁二醇酯-对苯二甲酸丁二醇酯；PBAT）和接枝甲基丙烯酸缩水甘油酯的聚烯烃弹性体（POE-g-GMA），以10%和20%的重量比共混时的增韧机制。拉伸和夏比冲击试验表明PLA的性能总体上有所改善。分散相的形态表明PBAT呈球形，而POE-g-GMA具有双球/纤维形态。为了将微观力学变形机制与宏观力学行为相关联，使用几种微观技术（扫描电子显微镜、偏振热光学显微镜和透射电子显微镜）对采用四点弯曲试验（根据单边双切口四点弯曲（SEDN-4PB）技术）的双切口试样的亚临界裂纹尖端损伤区进行了分析。损伤主要由剪切屈服变形产生，尽管观察到与膨胀带相关的空隙。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/a0e8/8625029/b19b95feabd2/polymers-13-04053-g009.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/a0e8/8625029/9d9481a46653/polymers-13-04053-g001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/a0e8/8625029/915b5a8d8ce5/polymers-13-04053-g002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/a0e8/8625029/ca542aed649c/polymers-13-04053-g003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/a0e8/8625029/b45f9d4084c6/polymers-13-04053-g004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/a0e8/8625029/2e56fb21b850/polymers-13-04053-g005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/a0e8/8625029/24bc0ca0950e/polymers-13-04053-g006.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/a0e8/8625029/d5aa358c6703/polymers-13-04053-g007.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/a0e8/8625029/f8dd33179af1/polymers-13-04053-g008.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/a0e8/8625029/b19b95feabd2/polymers-13-04053-g009.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/a0e8/8625029/9d9481a46653/polymers-13-04053-g001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/a0e8/8625029/915b5a8d8ce5/polymers-13-04053-g002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/a0e8/8625029/ca542aed649c/polymers-13-04053-g003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/a0e8/8625029/b45f9d4084c6/polymers-13-04053-g004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/a0e8/8625029/2e56fb21b850/polymers-13-04053-g005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/a0e8/8625029/24bc0ca0950e/polymers-13-04053-g006.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/a0e8/8625029/d5aa358c6703/polymers-13-04053-g007.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/a0e8/8625029/f8dd33179af1/polymers-13-04053-g008.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/a0e8/8625029/b19b95feabd2/polymers-13-04053-g009.jpg

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