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以八甲基环四硅氧烷(D_4)与1,3,5,7-四甲基环四硅氧烷(D~H_4)为原料,四甲基二硅烷(HMM)为封端剂,自制的KHS为催化剂,通过阳离子开环聚合方法合成氢封端含氢聚硅氧烷(H-PMHS-PDMS-H)。研究催化剂KHS的用量、反应温度和反应时间对合成产物氢封端含氢聚硅氧烷的分子量、含氢量的影响,并利用红外光谱(FTIR)、核磁共振(~1 H-NMR)和凝胶渗透色谱(GPC)对产物进行分析表征。结果表明:当催化剂KHS用量为2%(相对于单体质量百分数),反应温度为60℃,反应时间为8h时,产物的分子量和含氢量与设计分子理论值平均相符性达到90%以上。研究表明:采用自制催化剂KHS,通过阳离子开环聚合可以达到H-PMHS-PDMS-H的分子量和含氢量具有较好的可控性,同时反应无需通氮气保护、原料无需特殊干燥处理。
Using tetramethyldisilane (HMM) as the starting material and octamethylcyclotetrasiloxane (D_4) and 1,3,5,7-tetramethylcyclotetrasiloxane (D ~ H_4) Hydrogen-terminated hydrogen-containing polysiloxane (H-PMHS-PDMS-H) was synthesized by cationic ring-opening polymerization using KHS as catalyst. The effects of the amount of catalyst KHS, the reaction temperature and the reaction time on the molecular weight and hydrogen content of the hydrogen-terminated polysiloxane were investigated. The effects of KHS, FTIR, 1H NMR and The product was analyzed by gel permeation chromatography (GPC). The results show that when the KHS content of catalyst is 2% (relative to the mass percentage of monomer), the reaction temperature is 60 ℃, and the reaction time is 8h, the average molecular weight and hydrogen content of the product are 90% . The results show that the molecular weight and hydrogen content of H-PMHS-PDMS-H can be achieved by cationic ring-opening polymerization with self-made catalyst KHS. The reaction does not need nitrogen protection and the raw material does not need special drying treatment.