纳米SiO_2/OTAC协同稳定Pickering乳液聚合制备水基硅橡胶  

Preparation of water-based silicone rubber based on nano SiO_2/OTAC collaborative Pickering emulsion

作　　者：翟俊菱 沈敏敏[1] 孙淳宁 王俊凤[1,2] 哈成勇[1] 

机构地区：[1]中国科学院广州化学研究所纤维素化学重点实验室,广东广州510650 [2]中国科学院大学,北京100049

出　　处：《化工学报》2015年第4期1585-1592,共8页CIESC Journal

摘　　要：以十八烷基三甲基氯化铵(OTAC)协同纳米Si O2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Si O2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Si O2表面的吸附状态,用FT-IR、29Si NMR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(Si O2)=2.0%时,乳液流动性和稳定性最优;w(OTAC)=1.75%时,OTAC在纳米Si O2表面的单层吸附达到饱和,单体转化率为89%,粒径为617 nm,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。Pickering emulsion was obtained by using octadecyl trimethyl ammonium chloride（OTAC） in combination with nano Si O2, and linear polysiloxane（PDMS） was synthesized with D4 through ring-open polymerization under alkaline condition, and then cross-linking agent KH560 was added to prepare cationic water-based silicone rubber emulsion. The effects of Si O2 and OTAC contents on Pickering emulsion were investigated. The absorption behavior of OTAC on the surface of Si O2 was revealed by zeta potential, TEM and SEM. The structure of water-based silicone rubber was characterized with FT-IR, 29 Si NMR spectra. The effects of KH560 on the contact angle and Shore A hardness of the rubber film were also investigated. The emulsion possessed optimal liquidity and stability when w（Si O2）=2.0%. When w（OTAC）=1.75%, the absorption of OTAC reached saturation on the surface of Si O2, monomer conversion was about 89%, particle size was about 617 nm, zeta potential was close to zero, Mn and PDI for PDMS were 16036 and 1.485 respectively. When w（KH560）= 5.0%, PDMS hydrolyzed and condensed fully with KH560, and the obtained rubber film possessed optimal hydrophobicity and hardness.

关 键 词：Pickering乳液 纳米SIO2 表面活性剂 稳定性 水基硅橡胶 聚合 制备 

分 类 号：TQ050.425[化学工程]