Modification of lipase fromCandida rugosa with poly(ethylene oxide-co-maleic anhydride) and its separation using aqueous two-phase partition system

A copolymer was synthesized from polyethylene oxide (PEO) and maleic acid anhydride (MA). Number of ethylene oxide units was varied from 10 to 40. Lipase fromCandida rugosa was modified through chemical bonding of MA with amino group of lipase. Degree of modification increased with a decrease in EO unit and increase in copolymer/ enzyme ratio. The relative activity of modified enzyme increased with increase in EO unit. It was more than native lipase (100%) when copolymer/enzyme weight ratio was less than 3 for all copolymers. It might be due the conformation change of the lipase molecules on modification that would have exposed the catalytic sites making them more easily accessible. At the highest DM (39%), modified lipase retained more than 50% relative activity. Partitioning of native and modified lipase was also studied by using aqueous two phase synthesized copolymer/dextran system: modified lipase (with EO 30 and 40) showed better separation than the native one. Partition coefficient increased with increase in copolymer/enzyme weight ratio.     

无规羧基丁腈增韧环氧树脂耐高温粘合剂的研究

研究了用无规羧基丁腈橡胶增韧环氧树脂耐高温粘合剂的制备。探讨了其配方组成、无规羧基丁腈的用量、固化剂用量等对粘接强度的影响。用增韧的环氧树脂制出的耐高温粘合剂,常温下剪切强度为27.5Mpa,高温150℃下为22.0Mpa, 经250℃高温处理后剪切强度为19.6Mpa。     

氯菌酸酐的合成

报道了1种改进的氯菌酸酐合成法。该法用甲苯作溶剂,由六氯环戊二烯与顺酐进行Diels-Alder反应制取氯菌酸酐,产率可达70％～80％。     

多聚磷酸催化合成荧光黄

选用多聚磷酸作催化剂,考察了用邻苯二甲酸酐与间苯二酚合成荧光黄的最佳反应条件。实验结果表明:在多聚磷酸催化下,于150～160℃反应2h,平均产率可达95.8％。本法具有反应温度低、时间短、操作简单、产率高等特点。     

苯乙烯-N-苯基马来酰亚胺-马来酸酐三元共聚物的合成、性质及应用

采用溶液及微乳液两种聚合法,合成苯乙烯-N-苯基马来酰亚胺-马来酸酐(St-NPMI-MAH)三元共聚物。通过IR,1HNMR,13CNMR,GPC表征共聚物结构,溶液聚合产物为嵌段共聚物,乳液聚合产物为无规共聚物。采用DSC、TGA研究共聚物的热性能,溶液聚合产物的玻璃转化温度为212.9℃,5%热失重温度为348℃;微乳液聚合产物的玻璃转化温度为214.4℃,5%热失重温度为374℃。     

顺酐催化剂制备的几个理论问题

本文探讨了苯气相固定床催化氧化制顺酐过程中还原/氧化机理及反应动力学方程、催化剂转移电子的功能和催化剂的酸碱性,并对在V-Mo-O顺酐催化剂的生产及应用中如何理解和应用这些理论做了分析。     

超韧PA6/ABS合金的制备

以苯乙烯-马来酸酐（SMA）共聚物为增容剂,考察了ABS及SMA的含量对PA6／ABS共混体系的力学性能的影响;并利用SEM研究了PA6／ABS冲击断面的相结构。研究表明：SMA是PA6／ABS共混体系的有效增容剂。随着其含量的增加,分散相ABS粒子的尺寸减小,分散更加均匀,能显著地改善PA6／ABS共混物的冲击、拉伸和弯曲性能。在该共混体系中,ABS含量的增加能够大幅度地提高PA6／ABS共混物的冲击韧性;但当ABS含量超过10％时,将使PA6／ABS共混物的拉伸和弯曲性能明显下降。SMA的添加量为0．5％,且质量比为90／10的PA6／ABS共混体系能保持较好的加工性能,制备的PA6／ABS合金具有最佳的综合力学性能和超高韧性．Izod缺口冲击强度高达1200J／m。     

膦基丙烯酸-马来酸酐共聚物阻垢剂ZPS-01的合成及阻垢性能

合成了膦基丙烯酸－马来酸共聚物阻垢剂ＺＰＳ－０１。最佳工艺条件为：ＡＡ、ＭＡ摩尔比７５：２５，次磷酸盐２０％，引发剂１０％，反应时间４ｈ，反应温度９０℃，静态阻垢性能测试结果表明，ＺＰＳ－０１用作油田污水的阻垢剂，综合性能优于常用阻垢剂ＨＥＤＰ。