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化工学报  2015 

纳米SiO2/OTAC协同稳定Pickering乳液聚合制备水基硅橡胶

DOI: 10.11949/j.issn.0438-1157.20141547, PP. 1585-1592

Keywords: Pickering乳液,纳米SiO2,表面活性剂,稳定性,水基硅橡胶,聚合,制备

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Abstract:

以十八烷基三甲基氯化铵(OTAC)协同纳米SiO2制备Pickering乳液,碱性条件下引发D4开环聚合制备线性聚硅氧烷(PDMS),然后加入交联剂KH560制备阳离子型水基硅橡胶乳液。考察了纳米SiO2与OTAC用量对Pickering乳液性能的影响,通过zeta电位、TEM及SEM研究了OTAC在SiO2表面的吸附状态,用FT-IR、29SiNMR对水基硅橡胶的结构进行了表征,研究了KH560用量对橡胶膜对水接触角和邵氏硬度的影响。结果表明:w(SiO2)=2.0%时,乳液流动性和稳定性最优;w(OTAC)=1.75%时,OTAC在纳米SiO2表面的单层吸附达到饱和,单体转化率为89%,粒径为617nm,zeta电位接近零点,PDMS的数均分子量为16036,PDI为1.485;w(KH560)=5.0%时,KH560与PDMS充分水解缩合,硅橡胶膜憎水性和硬度显著提高。

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