02131nas a2200217   4500008004100000022001400041245009900055210006900154260009900223300001400322490000700336520130000343653001301643653001501656653002401671100002701695700002001722700002501742700001701767856012901784       2005                        eng d  a0032-386100aPolycondensation in liquid crystalline phases of nonionic surfactants. Kinetics and morphology0 aPolycondensation in liquid crystalline phases of nonionic surfac  aTHE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, OXON, ENGLANDbELSEVIER SCI LTDcSEP  a7961-79680 v463 a<p>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.</p>10anonionic10asurfactant10atemplated synthesis1 aKumaraswamy, Guruswamy1 aWadekar, M., N.1 aAgrawal, Vikrant, V.1 aPasricha, R.  uhttps://library.ncl.res.in/content/polycondensation-liquid-crystalline-phases-nonionic-surfactants-kinetics-and-morphology-0