Polycondensation in liquid crystalline phases of nonionic surfactants. Kinetics and morphology

被引：5

作者：

Kumaraswamy, G ^{[1
]}

Wadekar, MN ^{[1
]}

Agrawal, VV ^{[1
]}

Pasricha, R ^{[1
]}

机构：

[1] Natl Chem Lab, Pune 411008, Maharashtra, India

来源：

POLYMER | 2005年 / 46卷 / 19期

关键词：

surfactant; nonionic; templated synthesis;

D O I：

10.1016/j.polymer.2005.07.001

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

We have investigated acid-catalyzed polycondensation of alkoxysilane monomers in liquid crystalline phases of nonionic CnEm surfactants. The liquid crystalline phase is retained when the monomers polymerize. The high molecular weight molecules formed phase separate from the mesophase and are subsequently organized by it to form micron-sized particles. A variety of particle morphologies are formed by organization of the polymer particles in the mesophase. For condensation of dimethyldimethoxysilane (DMS, with trimethoxysilane, TMS as crosslinker) in hexagonal and lamellar phases, specific reaction conditions, viz. slow condensation kinetics and low crosslink density, give rod-like particles in hexagonal phases and sheet-like structures in lamellar phases. However, when higher acid concentrations are used, the reaction kinetics accelerates and irregular particles form. Irregular particles also form when the fraction of trifunctional crosslinker is increased, and finally complex flower-like structures form for condensation of trimethoxysilane in the hexagonal phase. The particle morphology formed is crucially dependent on the details of the polycondensation rate, crosslinker density and surfactant-monomer/oligomer interactions. (c) 2005 Elsevier Ltd. All rights reserved.

引用

页码：7961 / 7968

页数：8

共 27 条

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