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采用氢氧化锂作引发剂,N,N-二甲基甲酰胺(DMF)作促进剂,八甲基环四硅氧烷(D_4)》、八苯基环四硅氧烷(P_4)及四甲基—四乙烯基环四硅氧烷(V_4)作单体,合成了聚二甲基—二苯基硅氧烷(A)与聚二甲基—甲基乙烯基硅氧烷(B)形成的AB嵌段共聚物,研究了氢氧化锂的用量及反应时间对反应的影响,并且用HNMR、IR、UV谱及特性粘数对嵌段聚合物进行了表征。同时采取逐步沉降分级的方法,给出了分子量分布。
Lithium hydroxide was used as initiator and N, N-dimethylformamide (DMF) as accelerator, octamethylcyclotetrasiloxane (D_4) ", octaphenylcyclotetrasiloxane (P_4) Methyl-tetravinylcyclotetrasiloxane (V_4) as monomer to synthesize polydimethyl-diphenylsiloxane (A) and polydimethyl-methylvinylsiloxane (B) The effects of the amount of lithium hydroxide and the reaction time on the reaction were studied. The block copolymers were characterized by means of HNMR, IR, UV spectra and intrinsic viscosities. At the same time, the method of gradual sedimentation classification was adopted and the molecular weight distribution was given.