文献类型：期刊文献

英文题名：Preparation of poly (L-lactic acid) with aligned structures by unidirectional freezing

作者：Chu, Yeqian[1];Lu, Zhen[1];Li, Junjie[1];Zhu, Yun[1];Zhang, Shengmiao[1];Chen, Jianding[1]

机构：[1]E China Univ Sci & Technol, Shanghai Key Lab Adv Polymer Mat, Key Lab Ultra Fine Mat, Minist Educ,Sch Mat Sci & Engn, Shanghai 200237, Peoples R China

年份：2015

卷号：26

期号：6

起止页码：606

外文期刊名：POLYMERS FOR ADVANCED TECHNOLOGIES

收录：;EI(收录号：20151900818600);WOS:【SCI-EXPANDED(收录号:WOS:000354639300010)】；

基金：This research was supported by the National Natural Scientific Foundation of China (51203048, 51103042), Fundamental Research Funds for the Central Universities, Innovation Program of Shanghai Municipal Education Commission (12ZZ056), and Shanghai Key Laboratory Project (08DZ2230500).

语种：英文

外文关键词：unidirectional freezing; porous materials; aligned structure; poly (L-lactic acid)

摘要：Honeycomb monolith structured porous poly (L-lactic acid, PLA) was simply fabricated by employing a unidirectional freeze-casting technique. Dimethyl sulfoxide (DMSO) was used as a solvent for PLA, and the solution was unidirectionally frozen. The DMSO was nucleated in the solution and was grown in the freezing direction. The PLA was solidified and structured with the DMSO crystal as a template. Then DMSO was leached by water, ethanol, or the mixture of them, and subsequently the porous PLA was dried by oven. It was found that the freeze-casting protocol can significantly influence the morphological features such as the tube diameter and wall thickness of tube can be tuned by varying of PLA concentration, freezing temperature, and the nature of leaching solvent. Because DMSO has a special solubility of a number of polymers, this method may be a general way for designing and preparing aligned porous materials. Copyright (c) 2015 John Wiley & Sons, Ltd.