摘要
以1,3,5-三甲基-1,3,5-(三氟丙基)环三硅氧烷(D3F)、八甲基环四硅氧烷(D4)、四甲基四乙烯基环四硅氧烷(D4Vi)为原料,开环聚合得到乙烯基封端聚硅氧烷(FSI);随后,通过自由基聚合方式将全氟己基乙烯(TE-6)接枝到FSI上,合成了含氟聚硅氧烷(FSI-F).采用NMR、GPC、FTIR表征了FSI-F的结构与相对分子质量.以FSI-F为疏水改性材料、注塑级聚丙烯(PP)为基材、正十六烷基三甲氧基硅烷(Dynasylan 9116)为相容性改性剂,通过熔融共混制得了FSI-F/PP复合材料.采用正交实验法优化了FSI-F质量分数、TE-6 与D4Vi物质的量比、Dynasylan 9116 质量分数对FSI-F/PP复合材料的疏水、疏油、力学性能的影响;通过SEM、AFM和TG-DSC 揭示了 FSI-F/PP 复合材料形貌与热学性能与其综合性能的内在联系.结果表明,当 n(D4Vi)∶n(TE-6)=1∶2、FSI-F质量分数为6%、Dynasylan 9116质量分数为2%时,FSI-F/PP复合材料的疏水角、疏油角、拉伸强度和断裂伸长率分别为130.4°、52.8°、37.56 MPa、1125.67%,有望应用于自清洁、管道减阻等领域.
Abstract
Vinyl terminated polysiloxane(FSI)was prepared by ring opening polymerization of 1,3,5-trimethyl-1,3,5-(trifluoropropyl)cyclotrisiloxane(D3F),octamethylcyclotetrasiloxane(D4),and tetramethyltetravinylcyclotetrasiloxane(D4Vi),onto which(perfluorohexanyl)ethylene(TE-6)was grafted via free radical polymerization to obtain fluorinated polysiloxane(FSI-F).The structure and relative molecular mass of FSI-F were characterized by NMR,GPC,and FTIR.FSI-F/polypropylene(PP)composite was then synthesized by melt blending using FSI-F as hydrophobic modification material,injection molding grade PP as base material,and n-hexadecyltrimethoxysilane(Dynasylan 9116)as compatibility modifier.The effects of FSI-F mass fraction,mole ratio of TE-6 to D4Vi,and mass fraction of Dynasylan 9116 on the hydrophobic,oleophobic and mechanical properties of FSI-F/PP composite were optimized by orthogonal experiments,while the intrinsic relationship between morphology,thermal properties of FSI-F/PP composites and their comprehensive performances was evaluated by SEM,AFM,and TG-DSC.The results showed that the composite,prepared under conditions of n(D4Vi)∶n(TE-6)= 1∶2,mass fraction of FSI-F 6%,and mass fraction of Dynasylan 9116 2%,exhibited hydrophobic angle,oleophobic angle,tensile strength,and elongation at break of 130.4°,52.8°,37.56 MPa,and 1125.67%,respectively,which showed promising application in fields such as self-cleaning and pipeline drag reduction.
基金项目
湖北省技术创新专项(重大专项)(2020BED029)
湖北省111引智计划项目(2018-19-1)
NETL
NSTL
万方数据