Emulsion Copolymerization of Vinyl Acetate and Vinyl Silanes: Kinetics and Development of Microstructure. Issue 2 (10th January 2020)

• Record Type: Journal Article
• Authors: Barquero, Aitor; Agirre, Amaia; Barandiaran, María Jesús; Leiza, Jose Ramon
• Is Part Of: Macromolecular reaction engineering. Volume 14:Issue 2(2020)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2020-01-10
• Subjects: emulsion polymerization -- latex microstructure -- vinyl acetate -- vinyl trialkoxysilanes; Polymers -- Periodicals; Polymerization -- Periodicals; Reaction mechanisms (Chemistry) -- Periodicals; Electronic journals; 547.705
• DOI: 10.1002/mren.201900043
• Languages: English
• ISSNs: 1862-832X

Abstract

Abstract: The batch emulsion copolymerization of vinyl acetate with different vinyl silane functional monomers (vinyl trimethoxysilane [VTMS], vinyl triethoxysilane [VTES], and vinyl silanetriol [VSTO]) is studied. The nature of the silane strongly affects the development of the microstructure and crosslinking ability of the latexes. A combination of techniques (Soxhlet extraction, centrifugation, assymetric‐flow field flow fractionation AF4/MALS/RI) shows that the factor controlling the molar mass and crosslinking density is the degree of hydrolysis of the alkoxysilane, producing higher molar masses and degrees of crosslinking when the degree of hydrolysis is high. Thus, the copolymer containing VSTO produced a very crosslinked latex, the one with VTMS produced a latex with a low degree of crosslinking in the wet state that can yield high degrees of crosslinking upon drying, and the latex with VTES do not produce significant amounts of crosslinking neither before nor after drying. Abstract : Alkoxysilane monomers are a promising alternative to synthetize self‐crosslinkable latexes. The choice of alkoxysilane has a crucial role on the development of the microstructure of the copolymer. A fast hydrolyzing alkoxysilane yields high degrees of crosslinking, while a slow hydrolyzing silane shows nearly no effects; a balance must be found.