摘要
以水为溶剂的干法纺再生丝素蛋白纤维可通过后处理提高其力学性能,且后处理方法对纤维性能的提高程度有很大影响。为了优化干法纺再生丝素蛋白纤维的后处理工艺,定量研究了两种后处理方法中再生丝素蛋白分子的取向结构和构象演变,即方法A(纤维先在φ=80%的乙醇水溶液中浸泡1 h,再在热蒸汽中拉伸2倍)与方法B(纤维先在φ=80%的乙醇水溶液中拉伸2倍,再在该溶液中浸泡1 h)。探讨了纤维结构变化与力学性能之间的关系。结果表明:在乙醇水溶液中或在热蒸汽中拉伸均比仅在乙醇水溶液中浸泡更有利于丝素蛋白的构象转变,也对提高丝素蛋白分子链的取向更为有效。与方法A相比,方法B更能提高纤维的取向程度、β-折叠构象的含量以及力学性能。
The mechanical properties of silk fiber from regenerated silk fibroin（RSF） aqueous solution can be improved and greatly affected by post-treatment.In order to optimize the post-treatment process for the RSF fiber,the orientation and conformation development of the RSF molecules in two different post-treatment processes were studied quantitatively.The two processes are named as method A（the RSF fiber was immersed in φ=80% ethanol solution for 1 h then drawn 2 times in steam） and method B（the RSF（fiber） was drawn 2 times in φ=80% ethanol solution then immersed in the same solution for 1 h）.Furthermore,the relationship between the conformation transition and the mechanical properties of the RSF fibers was discussed.Comparing to immersing the fiber in ethanol aqueous solution,it is more efficient to transit the RSF conformation and improve the RSF orientation by post-drawing the fiber in（ethanol） aqueous solution or in steam.Thus,method B instead of method A was adopted for an optimal process due to the（resultant） high β-sheet content,orientation and excellent mechanical properties of the RSF fibers.
出处
《功能高分子学报》
CAS
CSCD
北大核心
2010年第4期385-390,共6页
Journal of Functional Polymers
基金
国家自然科学基金(50803011)
高等学校博士学科点专项科研基金(200802550001)
教育部留学回国人员科研启动基金
上海市教育发展基金会“晨光计划”项目(2007CG44)
上海市浦江人才计划项目(09PJ1400700)
上海市重点学科建设项目(B603)
关键词
再生丝素蛋白纤维
干法纺丝
后处理
结构转变
regenerated silk fibroin fiber
dry spinning
post-treatment
conformation transition
