Poly (l-Lactic acid)/silk fibroin composite membranes with improved crystallinity and thermal stability from non-solvent induced phase separation processes involving hexafluoroisopropanol

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• 作者：Ailin Gao^a ; ^b ; Qing Yang^a ; Lixin Xue^a ; ^b ; ^{xuelx@nimte.ac.cn" class="auth_mail" title="E-mail the corresponding author}
• 关键词：PLLA porous membrane ; HFIP ; Crystal behavior ; Phase separation
• 刊名：Composites Science and Technology
• 出版年：2016
• 出版时间：23 August 2016
• 年：2016
• 卷：132
• 期：Complete
• 页码：38-46
• 全文大小：2935 K

文摘

The crystallinity of semi-crystallized Poly (l-Lactic acid) (PLLA) is low, especially as a porous membrane prepared from non-solvent induced phase separation (NIPS) process. To improve the crystallinity and thermal stability of PLLA porous membranes, hexafluoroisopropanol (HFIP) was added into the PLLA casting solution together with a small amount of Silk Fibroin (SF). It is found that by optimizing the additive amounts of HFIP and SF, PLLA composite membranes with improved crystallinity (up to 47.1%) and endurance to temperature (above 90 °C) could be prepared with comparable mechanical property to the virgin PLLA membranes. The effects of HFIP in NMP solution on PLLA during the NIPS process was further investigated using dynamic rheological methods relating to the crystallinity of the formed PLLA porous membranes.