KINETICS OF CATIONIC MINIEMULSION RINGOPENING POLYMERIZATION FOR OCTAMETHYLCYCLOTERTRASILOXANE

SHEN Junyi; SHAN Guorong

doi:10.3724/SP.J.1105.2008.00013

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KINETICS OF CATIONIC MINIEMULSION RINGOPENING POLYMERIZATION FOR OCTAMETHYLCYCLOTERTRASILOXANE

Research Article | 更新时间：2021-03-19

- KINETICS OF CATIONIC MINIEMULSION RINGOPENING POLYMERIZATION FOR OCTAMETHYLCYCLOTERTRASILOXANE
- Acta Polymerica Sinica Issue 1, Pages: 13-17(2008)
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- DOI：10.3724/SP.J.1105.2008.00013
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- Published：20 January 2008，
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SHEN Junyi, SHAN Guorong. KINETICS OF CATIONIC MINIEMULSION RINGOPENING POLYMERIZATION FOR OCTAMETHYLCYCLOTERTRASILOXANE. [J]. Acta Polymerica Sinica (1):13-17(2008)
DOI：

SHEN Junyi, SHAN Guorong. KINETICS OF CATIONIC MINIEMULSION RINGOPENING POLYMERIZATION FOR OCTAMETHYLCYCLOTERTRASILOXANE. [J]. Acta Polymerica Sinica (1):13-17(2008) DOI： 10.3724/SP.J.1105.2008.00013.

摘要

以十二烷基苯磺酸钠(SDBS)为乳化剂，硫酸或盐酸为催化剂，八甲基环四硅氧烷(D4)为单体，十六烷为共稳定剂，超声预乳化，制备了聚硅氧烷细乳液，研究了超声时间、催化剂用量、乳化剂用量和温度对聚合动力学的影响.结果表明，在一定酸度范围内，聚合速度与硫酸浓度0.81次方、与盐酸浓度1.02次方、与乳化剂浓度-0.66次方成正比，反应的表观活化能为40.56 kJ/mol.

Abstract

Polydimethylsiloxane emulsions are widely used in coatings

personal care products

because of their low toxicity

high chain flexibility and low surface energy.It has various good properties

such as thermal stability

low temperature performance and lubricity.It has been applied to different areas of industry.A polydimethylsiloxane miniemulsion was prepared with sodium dodecylbenzene sulfonate (SDBS) as emulsifier

sulfuric acid or hydrochloric acid as catalyst

octamethylcyclotertrasiloxane (D4 as monomer

hexadecane (HD) as costabilizer and ultrasonication as preemulsification method.By reducing the monomer droplet size using pre_emulsifying method

and using hydrophobic substance as costabilizer to retard monomer transfer in aqueous phase

the monomer droplets become independent mini_reactors in miniemulsions.The effects of ultrasonic time

amount of catalyst and emulsifier

and temperature on kinetics of miniemulsion polymerization were investigated.Short ultrasonication time is not sufficient for obtaining the stable miniemulsion and high conversion of D

关键词

八甲基环四硅氧烷细乳液正离子聚合动力学

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