Synthesis Of Amine-terminating Agents And Its Characteristic And Application

At present, the end-functionalized technique is a kind of effective means to reduce the rolling resistance of the tire. And using the functionalized electrophiles (also known as terminating agents) which can react with the living polymer chain end to introduce a series of functional groups is the most common method. At home and abroad, it has been an important research to develop the new terminating agents having good terminal modification effect. Therefore, in this paper, two novel kind of amine-terminating agents are synthesized, which can introduce both amine group and alkoxysilyl group to the polymer chain end. Then, we applied the two amine-terminating agents to the anionic polymers’terminating reaction, and investigate the effects of various factors on the terminating reaction efficiency.In this paper, we design and synthesize two kind of amine-terminating agen-ts:N-b-enz-ylidene-3-(triethoxysilyl)-1-propaneamine (Imine-TEOS) and N-(N,N-di methyl-b-en-zylidene)-3-(triethoxysilyl)-1-propaneamine (Imine-DTEOS). Their mole cular str-ucture are characterized by IR spectrum and1H-NMR spectrum. In addit ion, thr-ough changing the reactive temperature, the reactive time and dropping s equence of the react-ants, we identify the optimum reaction conditions.In this study, cyclohexane is used as solvent, THF is used as structure regulator, n-BuLi is used as initiator, the above synthesized amine-terminating agents are added into the anionic polymerization system to react with the model polymer:polystyrene. The optimum terminating condition is fixed by investigating the influence of molar ratio of amine-terminating agents and initiator, terminating reactive time, terminating reactive temperature and molecule weight to the terminating efficiency. Comparison shows that in the reactive of terminating PS, the condition of Imine-TEOS is easier than Imine-DTEOS. In addition, according to the optimum terminating condition, we use the two kind of amine-terminating agents to end-functionalize polybutadiene, and investigate the terminating efficiency. In comparison with end-functionalized polystyrene, the terminating efficiency of polybutadiene is higher. At last, we use the two kind of amine-terminating agents to end-functionalize the styrene-butadiene copolymer and investigate the terminating efficiency in order to lay theoretical foundation for end-functionalizing SSBR by the two amine-terminating agents.