Condensation polymerization of oligomeric polydimethylsiloxanols in aqueous emulsion

Autor:	John Carlton Saam, David Joel Huebner
Rok vydání:	1982
Předmět:	chemistry.chemical_classification Silanol chemistry.chemical_compound End-group Aqueous solution Condensation polymer chemistry Polymerization Pulmonary surfactant Polydimethylsiloxane Polymer chemistry Polymer
Zdroj:	Journal of Polymer Science: Polymer Chemistry Edition. 20:3351-3368
ISSN:	1542-9369 0360-6376
DOI:	10.1002/pol.1982.170201209
Popis:	Polydimethylsiloxane oligomers with silanol ends condense in aqueous dispersion under mild conditions to form high polymers in the presence of sulfonic acid surfactants. The process follows a second-order rate law in silanol if reversibility is taken into account. The second-order rate constant is proportional to the area at the oil–water interface and is a complex function of surfactant concentration. The principal driving force is the heat of condensation of the water produced in the polymerization. A mechanism paralleling surface catalysis is offered in which a termolecular complex that consists of two surfactant molecules and one silanol end group reacts bimolecularly at the oil–water interface.
Databáze:	OpenAIRE
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