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

化工学报 ›› 2015, Vol. 66 ›› Issue (4): 1585-1592.DOI: 10.11949/j.issn.0438-1157.20141547

• 材料化学工程与纳米技术 • 上一篇下一篇

纳米SiO₂/OTAC协同稳定Pickering乳液聚合制备水基硅橡胶

翟俊菱^1,2, 沈敏敏¹, 孙淳宁^1,2, 王俊凤^1,2, 哈成勇¹

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

收稿日期:2014-10-13 修回日期:2014-12-11 出版日期:2015-04-05 发布日期:2015-04-05
通讯作者: 沈敏敏
作者简介:翟俊菱(1988-),男,硕士研究生。

Preparation of water-based silicone rubber based on nano SiO₂/OTAC collaborative Pickering emulsion

ZHAI Junling^1,2, SHEN Minmin¹, SUN Chunning^1,2, WANG Junfeng^1,2, HA Chengyong¹

1. Laboratory of Cellulose and Lignocellulosics Chemistry, Guangzhou Institute of Chemistry, Chinese Academy of Sciences, Guangzhou 510650, Guangdong, China;
2. University of Chinese Academy of Sciences, Beijing 100049, China

Received:2014-10-13 Revised:2014-12-11 Online:2015-04-05 Published:2015-04-05

摘要/Abstract

摘要：

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、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(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。

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

Abstract:

Pickering emulsion was obtained by using octadecyl trimethyl ammonium chloride (OTAC) in combination with nano SiO₂, 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 SiO₂ and OTAC contents on Pickering emulsion were investigated. The absorption behavior of OTAC on the surface of SiO₂ was revealed by zeta potential, TEM and SEM. The structure of water-based silicone rubber was characterized with FT-IR, ²⁹Si 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(SiO₂)=2.0%. When w(OTAC)=1.75%, the absorption of OTAC reached saturation on the surface of SiO₂, monomer conversion was about 89%, particle size was about 617 nm, zeta potential was close to zero, M_n 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.

Key words: Pickering emulsion, nano SiO₂, surfactants, stability, water-based silicone rubber, polymerization, preparation

中图分类号:

TQ050.4⁺25

翟俊菱, 沈敏敏, 孙淳宁, 王俊凤, 哈成勇. 纳米SiO₂/OTAC协同稳定Pickering乳液聚合制备水基硅橡胶[J]. 化工学报, 2015, 66(4): 1585-1592.

ZHAI Junling, SHEN Minmin, SUN Chunning, WANG Junfeng, HA Chengyong. Preparation of water-based silicone rubber based on nano SiO₂/OTAC collaborative Pickering emulsion[J]. CIESC Journal, 2015, 66(4): 1585-1592.

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纳米SiO₂/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 SiO₂/OTAC collaborative Pickering emulsion

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