Study On The Reaction Of SEBS Melted-grafting MAH And Its Graft Mechanics

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.