Study of the effects of progressive changes in alkoxysilane structure on sol-gel reactivity

Article Abstract:

The effects of the structure of an alkoxysilane on the early reaction kinetics of sol-gel polymerization are examined in basic and acidic conditions. A high electron density at silicon leads to a low reactivity in basic condition but a high reactivity in acidic conditions and only bis(trimethoxysilylpropyl)amine (BTMSPA) in basic conditions defies these trends, possibly due to the effects of solvation near the reactive silicon site.

All Other Basic Organic Chemical Manufacturing, Industrial Organic Chemicals, Silanes, Structure, Silane

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Thermoresponsive triblock copolymer aggregates investigated by laser light scattering

Article Abstract:

A polystrene-b-poly(N-isopropylacrylamide)-b-polystrene (PS-b-PNIPAM-b-PS) triblock copolymer with trithicarbonate group in the middle of PNIPAM block is synthesized by using reversible addition fragmentation chain transfer (RAFT) polymerization. The temperature-induced collapse of the aggregates with the rings and coils in the corona using laser light scattering is investigated.

Light scattering, Copolymers

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Inducing pH responsiveness via ultralow thiol content in polyacrylamide (micro)gels with labile crosslinks

Article Abstract:

The synthesis and characterization of pH responsive polyacrylamide microgels via free radical polymerization of acrylamide and bis (acrylocylcystamine) (BAC) are presented. The results have shown that free thiol groups present within a polymer gel matrix have attributed the pH responsive behavior to the gel in solution.

Hydrogen-ion concentration, pH, Polyacrylamide

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