【作者】 郭艳；

【导师】 张爱民；

【作者基本信息】 四川大学 ， 材料学， 2004， 硕士

【摘要】 本文用程序升温DSC研究SEBS接枝马来酸酐（MAH）的反应动力学，为在双螺杆上进行SEBS熔融接枝MAH的反应挤出提供理论依据。用双螺杆挤出SEBS接枝MAH的产物后，通过FTIR确定SEBS接枝物的产生，用酸碱滴定法测定SEBS-g-MAH的接枝率和接枝效率：系统分析不同反应条件对SEBS熔融接枝MAH反应的影响；由示差扫描量热分析（DSC）、热失重（TG）研究SEBS接枝前后热性能变化；通过核磁共振¹³C、动态红外（In-situFTIR）研究SEBS的接枝机理。 通过研究得到了以下结论： 1．采用程序升温DSC研究SEBS熔融接枝MAH的反应动力学，从而分析SEBS接枝MAH过程。SEBS熔融接枝MAH反应分为四步：反应级数依次为：1，0.8246，0.9775，0.9689，而MAH接枝到SEBS分子链上是主要的（?）（?）步骤。 2．通过FTIR确定MAH已经接枝到SEBS分子链上，根据酸碱滴定法测定了SEBS-g-MAH的接枝率和接枝效率，系统研究了反应条件对接枝反应的影响，接枝后SEBS的EB段的Tg没有变化，PS段的Tg稍有降低；SEBS-g—MAH的热稳定性随着接枝率增加而增强。 3．通过In-situ FTIR跟踪SEBS接枝MAH的反应过程，从而研究其接四川大学硕士学位论文枝机理。结果表明，不同的引发剂其引发导致的接枝机理不一样。关键词:SEBS熔融接枝MAH接枝率机理热分析反应动力学更多还原

【Abstract】 In the paper, the reaction kinetics of SEBS melt grafting MAH by temperature-programming DSC was researched, which proved the theoretical basis for SEBS grafting MAH . On the basis of the above, the bulk functionalization of SEBS with maleic anhydride (MAH) and initiator by a twin-screw extruder was descried. It is confirmed that MAH has grafted on SEBS by means of FTIR. The graft degree and efficiency of SEBS-g-MAH was determined through acid-base titration. The effect of different reaction factors on SEBS melted-grafting was studied systematically. DSC and TG tested low-temperature performance and thermal stability of SEBS-g-MAH and SEBS. The thermal stability of SEBS-g-MAH and SEBS by DSC and TG was studied. The graft mechanics was explored by NMR-13C and in-situ FTIR.From the above research we made the conclusion that:1. Temperature-programming DSC researched the reaction kinetics ofSEBS melt grafting MAH, analyzing the progress of the reaction of SEBS melt grafting MAH. The results show that the grafting process is divided four steps. Stage number as follows: 1, 0.8246, 0.9775, 0.9689.2. It is confirmed that MAH has grafted on SEBS by means of FTIR. The graft degree and efficiency of SEBS-g-MAH was determined by acid-base titration. The effect of different reaction factors on the graftingacid-base titration. The effect of different reaction factors on the grafting reaction was studied systematically. Tg of EB was not influenced by graft. Tg of EB block reduced with graft ratio. The thermal performance of SEBS-g-MAH was enhanced.3. In the atmosphere of N2, in-situ FTIR traced the grafting process of SEBS grafting MAH. The mechanics of graft site was studied. The analysis shows that different initiator resulted the different mechanics.更多还原