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立体复合晶体的形成及其对聚-D-乳酸/聚-L-乳酸共混物形态和性能的影响

Formation of Stereocomplex Crystal and Its Effect on the Morphology and Property of PDLA/PLLA Blends.

作者信息

Su Xiaolong, Feng Lihua, Yu Demei

机构信息

School of Chemistry, State Key Laboratory of Electrical Insulation and Power Equipment, Xi'an Jiaotong University, Xi'an, Shaanxi 710049, China.

出版信息

Polymers (Basel). 2020 Oct 28;12(11):2515. doi: 10.3390/polym12112515.

DOI:10.3390/polym12112515
PMID:33126708
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC7694064/
Abstract

Stereocomplex-polylactic acid (SC-PLA) is obtained in poly(D-lactic) acid/poly(L-lactic) acid (PDLA/PLLA) blends under adjusting processing conditions. It is found that the degree of crystallinity of overall SC-PLA is up to 43.7% in PDLA/PLLA blends of 1:1 mass ratio. Formation of stereocomplex (SC) crystals forces molecular chains in the blends to be more closely arranged and further enhances interaction between molecular chains, thus forming a physical cross-linking network in the SC crystals, resulting in the blends having a special microstructure. The mechanism of formation of the SC crystal physical cross-linking network is elucidated by dielectric spectroscopy, and the relationships between homocomplex (HC) crystals, SC crystals, and amorphous regions in the blends are also analyzed. Interestingly, mechanical properties of the blends are significantly improved due to formation of an SC crystal cross-linking network.

摘要

通过调整加工条件，在聚（D-乳酸）/聚（L-乳酸）（PDLA/PLLA）共混物中获得了立体复合聚乳酸（SC-PLA）。发现在质量比为1:1的PDLA/PLLA共混物中，整体SC-PLA的结晶度高达43.7%。立体复合（SC）晶体的形成迫使共混物中的分子链排列得更紧密，并进一步增强了分子链之间的相互作用，从而在SC晶体中形成物理交联网络，导致共混物具有特殊的微观结构。通过介电谱阐明了SC晶体物理交联网络的形成机制，并分析了共混物中均相复合（HC）晶体、SC晶体和非晶区之间的关系。有趣的是，由于形成了SC晶体交联网络，共混物的机械性能得到了显著改善。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/fd96/7694064/de35cb33b7bb/polymers-12-02515-g008.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/fd96/7694064/38036c730716/polymers-12-02515-g001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/fd96/7694064/df44e7f88a08/polymers-12-02515-g002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/fd96/7694064/60775521ed99/polymers-12-02515-g003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/fd96/7694064/fe2278e423d0/polymers-12-02515-g004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/fd96/7694064/b6cca9edb001/polymers-12-02515-g005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/fd96/7694064/8d9e487f88f2/polymers-12-02515-g006.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/fd96/7694064/e632e9b197e1/polymers-12-02515-g007.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/fd96/7694064/de35cb33b7bb/polymers-12-02515-g008.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/fd96/7694064/38036c730716/polymers-12-02515-g001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/fd96/7694064/df44e7f88a08/polymers-12-02515-g002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/fd96/7694064/60775521ed99/polymers-12-02515-g003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/fd96/7694064/fe2278e423d0/polymers-12-02515-g004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/fd96/7694064/b6cca9edb001/polymers-12-02515-g005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/fd96/7694064/8d9e487f88f2/polymers-12-02515-g006.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/fd96/7694064/e632e9b197e1/polymers-12-02515-g007.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/fd96/7694064/de35cb33b7bb/polymers-12-02515-g008.jpg

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