降低丝素蛋白/柠檬酸/乙二醇膜对水的pH值影响的方法  

Methods to Reduce Influences of Silk Fibroin/Citric Acid/Ethylene Glycol Film on pH Value of Water

作　　者：张伟国[1,2] 庄高磊[1,2] 田保中[1,2] 

机构地区：[1]苏州大学纺织与服装工程学院,江苏苏州215021 [2]现代丝绸国家工程实验室,江苏苏州215123

出　　处：《丝绸》2013年第7期23-26,共4页Journal of Silk

基　　金：江苏省自然科学基金项目(BK2009149);现代丝绸国家工程实验室资助项目(20102903)

摘　　要：针对丝素蛋白/柠檬酸/乙二醇膜(SFCE膜)存在明显降低水的pH值的缺点,提出了利用碳酸钙溶液处理SFCE膜和利用醋酸改性SFCE膜两种方法。并对两种方法的处理效果、处理机理及处理对膜力学性能的影响进行了研究。结果表明:由于碳酸钙与柠檬酸分子上的羧基发生反应的能力有限,利用碳酸钙溶液处理膜,无法明显降低SFCE膜对水的pH值影响,而利用醋酸改性SFCE膜,由于醋酸可以与柠檬酸分子上的羟基反应,提高了柠檬酸3个羧基的反应能力,导致其羧基与乙二醇分子发生酯化反应而被封闭,从而明显降低了SFCE膜对水的pH值影响,使得改性后的SFCE膜对水的pH值基本没有影响,且膜的断裂强度有明显提高,但断裂伸长度有所下降。In allusion to the shortage of silk fibroin/citric acid/glycol membrane （SPCE membrane ） significant decrease of pH value of water, this paper puts forward two methods-using calcium carbonate solution to process SFCE membrane and using acetic acid to modify SFCE membrane and studies the treatment effect and mechanism of both methods and the influence of treatment on the mechanical property of the membrane. The result shows that, due to the limited ability of reaction between calcium carbonate and carboxyls on citric acid molecule, using calcium carbonate solution to process the membrane cannot significantly reduce the influence of SFCE membrane on pH value of water; however, using acetic acid to modify SFCE membrane can significantly reduce the influence of SFCE membrane on pH value of water as acetic acid can react with carboxyls on citric acid molecule, thus improving the reaction capacity of three carboxyls of citric acid and causing its carboxyls to have esterification reaction with glycol molecule and be closed; in this way, the modified SFCE membrane basically has no influence on pH value of water and the breaking strength of the membrane has significantly improved but its elongation at break has reduced.

关 键 词：丝素蛋白 柠檬酸 乙二醇 醋酸 PH值 

分 类 号：TB332[一般工业技术—材料科学与工程]