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Study on the Emulsion Polymerization of poly(vinyl acetate-co-ethylene) Using Poly(vinyl alcohol) as Emulsifier  

Choi, Yong-Hae (Division of Chemical Engineering, Pukyong National University)
Lee, Won-Ki (Division of Chemical Engineering, Pukyong National University)
Publication Information
Journal of Adhesion and Interface / v.11, no.3, 2010 , pp. 89-99 More about this Journal
Abstract
In this paper, for polymerization of poly(vinyl acetate-co-ethylene) (VAE) by redox system using poly(vinyl alcohol) (PVOH) as emulsifier on the properties of the final emulsion, and pH changes affect the physical properties of the final emulsion was investigated. The results of the molecular weight of PVOH had a dramatic impact on the emulsion properties. The used a low molecular weight of PVOH products was obtained low viscosity and using the high molecular weight of PVOH were obtained high viscosity product. However, changing the pH of the final polymerized product properties for the PVOH obtained different results. Generally, a poly(vinyl acetate) emulsion by a high degree of polymerization and high molecular weight of PVOH was obtained high viscosity of the final emulsion. But, in VAE was lower emulsion viscosity in high pH. This is the molecular weight of the emulsion during the synthesis of PVOH is considered to be affected by degradation. The final viscosity was decreased by grafting ratio and molecular weight were decreased with increasing of pH.
Keywords
vinyl acetate-co-ethylene; PVOH; EVA emulsion; VAE emulsion; adhesive;
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