文献类型：期刊文献

英文题名：Biocompatible polyurethanes with thermally-induced shape memory properties derived from three-arm branched poly (ε-caprolactone-co-γ-butyrolactone)-b-poly(lactide) block copolymers

作者：Jing, Zhanxin[1];Pan, Zhengrou[1];Liang, Jialing[1];Li, Yong[1];Said, Farhan Mohd[2]

机构：[1]Guangdong Ocean Univ, Coll Chem & Environm, Zhanjiang 524088, Guangdong, Peoples R China;[2]Univ Malaysia Pahang Al Sultan Abdullah, Fac Chem & Proc Engn Technol, Kuantan 26300, Pahang, Malaysia

年份：2024

卷号：206

外文期刊名：EUROPEAN POLYMER JOURNAL

收录：SCI-EXPANDED(收录号：WOS:001174902700001)、、EI(收录号：20240515450766)、Scopus(收录号：2-s2.0-85183116934)、WOS

基金：This work was supported by National Natural Science Foundation of China (52003060) , Natural Science Foundation of Guangdong Province (2023A1515011631) , College Featured Innovation Project of Guang- dong Province (2020KTSCX052) and Nanhai Scholars Talent Funding Program of Guangdong Ocean University (002029002012) .

语种：英文

外文关键词：Poly(lactide); Cross-linked; Shape memory; Biocompatibility

外文摘要：A series of poly(lactide)-based polyurethanes with cross-linked network structure was synthesized through the chain extension of three-arm branched poly(epsilon-caprolactone-co-gamma-butyrolactone)-b-poly(lactide) (3PBCL-b-PLA) block copolymers with various molecular weights and optical activities of PLA blocks. The structure of the synthesized poly(lactide)-based polyurethanes was analyzed, and it was confirmed that they contained the crosslinked network structure. Effects of the molecular weight and optical activity of PLA block on the various properties such as crystallization, mechanical property, shape memory performance, thermal stability and hydration ability were discussed. By simultaneously adjusting the molecular weight and optical activity of PLA blocks, the crystallization of flexible PCBL blocks and rigid PLA blocks in the synthesized cross-linked polyurethanes was effectively controlled, which was the basis for constructing poly(lactide)-based polyurethanes with a broad ranged mechanical property, excellent shape memory properties and controllable hydration ability. The synthesized polyurethanes exhibited adjusted tensile strength and elongation at break in the range of 11.2-32.4 MPa and 41-753 %, with the water content varying from 1.1 % to 20.1 %, respectively. The shape fixity ratio and shape recovery ratio of L-PU2.9 could reach 90.9 % and 96.0 %, respectively. The effect of stereocomplex-crystallization on the properties of poly(lactide)-based polyurethane was also analyzed. Stereocomplexed polyurethane based on 3PCL-b-PLA block copolymer enantiomers with short PLA block was constructed, which achieves fully stereocomplexation in a wide mixing ratio (20-50 %). It was found that the formation of a small number of stereocomplex-crystals can change the properties of poly(lactide)-based polyurethane in a wide range. Eventually, it was demonstrated by in vitro hemolysis test, cytotoxicity test and live/ death staining that the synthetic poly(lactide)-based polyurethanes exhibited excellent biocompatibility. These results suggested that these biocompatible shape memory poly(lactide)-based polyurethanes with tunable mechanical properties and hydration ability demonstrated the promising potential as an excellent implantation for biomedical application.