端羟基含氟乙烯基聚硅氧烷的合成及应用  

Synthesis and Application of Hydroxy Terminated Fluorinated Vinyl Polysiloxane

作　　者：李辉 姚敏 赖娟 马长坡 吴正德 邱祖民 LI Hui;YAO Min;LAI Juan;MA Changpo;WU Zhengde;QIU Zumin(School of Resources Environmental&Chemical Engineering,Nanchang University,Nanchang 330000,China)

机构地区：[1]南昌大学资源环境与化工学院,南昌330000

出　　处：《材料导报》2023年第2期238-243,共6页Materials Reports

基　　金：国家自然科学基金(51568048)。

摘　　要：室温硫化氟硅橡胶应用甚广,当分子量大时端羟基活性往往难以满足要求。以八甲基环四硅氧烷(D4)、三氟丙基三甲基环三硅氧烷(D3F)为聚合单体,四甲基四乙烯基环四硅氧烷(D4Vi)为活性基团引入单体,去离子水为封端剂,四甲基氢氧化铵((Me)4NOH)为催化剂催化进行阴离子开环共聚,制备高粘度端羟基含氟乙烯基聚硅氧烷。探究了封端剂用量、催化剂用量、硅氧烷链节比等因素对聚合反应的影响。通过核磁、红外测试分析共聚物的分子结构;通过热分析法测试共聚物热分解温度;通过凝胶色谱测试产物的分子量分布。研究结果表明:固定链节比,催化剂用量为总单体用量的0.012%、封端剂用量为0.285%时所得聚合物产率较高。对聚合物进行涂膜测试,结果表明,其涂膜室温固化性好,且具有良好的疏水性。By now,the room temperature vulcanized fluorosilicone rubber has been widely used.However,when its molecular weight is large,the activity of the hydroxyl terminated is often difficult to meet the requirements.In this paper,octamethylcyclotetrasiloxane(D4)and trifluoropropyl trimethylcyclotetrasiloxane(D3F)were selected as polymerization monomers,while tetramethyltetravinyl cyclotetrasiloxane(D4Vi)was used as an active group to introduce monomers.And deionized water and tetramethylammonium hydroxide((Me)4NOH)were used as the end capping agent and catalyst,respectively.An anionic ring-opening copolymerization reaction could be carried out to prepare the hydroxyl terminated fluorovinyl polysiloxane with high viscosity.The effects of the amount of end capping agent and catalyst as well as the ratio of siloxane on the polymerization were investigated in detail.The molecular structure of the copolymer was analyzed by HNMR and IR.The thermal decomposition temperature of the copolymer was measured by thermal analysis.The molecular weight distribution of the product was tested by gel chromatography.The results show that the polymer yield is higher,with the fixed chain link ratio,catalyst dosage of the total monomer dosage 0.012%,and end capping agent dosage 0.285%.The coating test results prove that the coating formed by the polymer has a good curing property and an excellent hydrophobicity at room temperature.

关 键 词：阴离子开环聚合 室温硫化 活性基团 高粘度 含氟聚硅氧烷 

分 类 号：TQ314[化学工程—高聚物工业]