Journal Article10.1111/J.1151-2916.1991.TB06794.X
Phase Separation in Gelling Silica–Organic Polymer Solution: Systems Containing Poly(sodium styrenesulfonate)
Kazuki Nakanishi,Naohiro Soga +1 more
388
TL;DR: In this article, phase separation in parallel to the hydrolysis and gelation of alkoxysilane solution containing poly(sodium styrenesulfonate) (NaPSS) has been investigated.
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Abstract: Phase separation which occurs in parallel to the hydrolysis and gelation of alkoxysilane solution containing poly(sodium styrenesulfonate) (NaPSS) has been investigated. Depending on the reaction conditions, gel morphologies such as isolated pores, particle aggregates, and interconnected continuous pores from 0.1 to 100 μm long have been observed. Time-resolved light scattering of gelling solution suggested the occurrence of spinodal phase separation through the polymerization of silica and the subsequent freezing of the developing structure by sol-gel transition. The effects of reaction parameters on the periodic size are explained mainly in terms of their influence on the “chemical cooling” rate which is determined by the polymerizatica rate of silica and the solubility of NaPSS in the reacting solution.
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Citations
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References
Better Ceramics Through Chemistry
Donald R. Ulrich
- 01 Jan 1988
TL;DR: In this article, the authors apply polymeric network theory to the design of gel ultrastructures and apply scaling calculations based on molecular orbital calculations for prediction of the silanol polymerization mechanism.
1.7K
Sol-gel processing of silica. II: The role of the catalyst
TL;DR: In this article, the effects of different types of catalysts on gelation time, porosity, bulk and apparent density, and volume shrinkage on drying were observed. And the authors proposed mechanisms for catalysis for the catalysts considered.
535
Time-resolved light scattering studies on kinetics of phase separation and phase dissolution of polymer blends. 1. Kinetics of phase separation of a binary mixture of polystyrene and poly(vinyl methyl ether)
TL;DR: In this article, the dynamics of liquid-liquid phase separation of a polymer blend of polystyrene and poly(viny1 methyl ether) was studied by time-resolved elastic light scattering techniques in both the nucleation-growth (NG) and spinodal-decomposition (SD) regimes.
Polymer-Based Molecular Composites
TL;DR: In this article, the development of polymeric materials over the last 30 years is discussed, and the chemist's ability to manipulate structure and tailor the properties of organic materials for specific applications is presented.
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