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通过与尿素的包合物聚结来增强聚乳酸的立体复合能力。

Enhancing Stereocomplexation Ability of Polylactide by Coalescing from Its Inclusion Complex with Urea.

作者信息

Liu Ping, Chen Xiao-Tong, Ye Hai-Mu

机构信息

Department of Materials Science and Engineering, China University of Petroleum, Beijing 102249, China.

Beijing Key Laboratory of Failure, Corrosion and Protection of Oil/Gas Facilities, China University of Petroleum, Beijing 102249, China.

出版信息

Polymers (Basel). 2017 Nov 9;9(11):592. doi: 10.3390/polym9110592.

DOI:10.3390/polym9110592
PMID:30965892
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC6418699/
Abstract

In this study, polylactide/urea complexes were successfully prepared by the electrospinning method, then the host urea component was removed to obtain a coalesced poly(L-lactide) (PLLA)/poly(D-lactide) (PDLA) blend. The crystallization behavior of the coalesced PLLA/PDLA blend (c-PLLA/PDLA) was studied by a differential scanning calorimeter (DSC) and Fourier transform infrared (FTIR) spectroscopy. The c-PLLA/PDLA was found to show better crystallization ability than normal PLLA/PDLA blend (r-PLLA/PDLA). More interestingly, the c-PLLA/PDLA effectively and solely crystallized into stereocomplex crystals during the non-isothermal melt-crystallization process, and the reason was attributed to the equally-distributing state of PLLA and PDLA chains in the PLLA/PDLA/urea complex, which led to good interconnection between PLLA and PDLA chains when the urea frameworks were instantly removed.

摘要

在本研究中，通过静电纺丝法成功制备了聚乳酸/尿素复合物，然后去除主体尿素成分以获得聚（L-丙交酯）（PLLA）/聚（D-丙交酯）（PDLA）共混物的聚结物。采用差示扫描量热仪（DSC）和傅里叶变换红外（FTIR）光谱对聚结的PLLA/PDLA共混物（c-PLLA/PDLA）的结晶行为进行了研究。发现c-PLLA/PDLA比普通的PLLA/PDLA共混物（r-PLLA/PDLA）具有更好的结晶能力。更有趣的是，c-PLLA/PDLA在非等温熔体结晶过程中有效地且仅结晶成立构复合晶体，其原因归因于PLLA/PDLA/尿素复合物中PLLA和PDLA链的均匀分布状态，当尿素骨架立即去除时，这导致PLLA和PDLA链之间具有良好的相互连接。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/bd56/6418699/759ac6a4d4c1/polymers-09-00592-g005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/bd56/6418699/3058546cb3e5/polymers-09-00592-g001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/bd56/6418699/19cb5576f574/polymers-09-00592-g002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/bd56/6418699/df9268a5f2e5/polymers-09-00592-g003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/bd56/6418699/f4dd1caffe03/polymers-09-00592-g004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/bd56/6418699/759ac6a4d4c1/polymers-09-00592-g005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/bd56/6418699/3058546cb3e5/polymers-09-00592-g001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/bd56/6418699/19cb5576f574/polymers-09-00592-g002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/bd56/6418699/df9268a5f2e5/polymers-09-00592-g003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/bd56/6418699/f4dd1caffe03/polymers-09-00592-g004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/bd56/6418699/759ac6a4d4c1/polymers-09-00592-g005.jpg

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