Mechanical properties of films of latexes based on copolymers BA/MMA/DAAM and BA/MMA/VEOVA-10/DAAM and the corresponding self-crosslinked copolymers using the adipic acid dihydrazide as crosslinking agent

摘要

The purpose of this investigation was to determine the mechanical properties of films of latexes based on the copolymers butyl acrylate (BA)/methyl methacrylate (MMA)/diacetone acrylamide (DAAM) and BA/MMA/vinyl neo-decanoate (VEOVA-10)/DAAM and the corresponding self-crosslinked copolymers using the adipic acid dihydrazide (ADH) as crosslinking agent. These copolymers were synthesized by a modified semi-continuous microemulsion copolymerization. During the copolymerization various emulsifier systems, stabilizing systems and monomer compositions were used. The static tensile strength of films of all copolymers prepared was determined. Also, the prepared films were tested by dynamic mechanical analysis (DMA) for the determination of storage modulus (E′), loss modulus (E″), tangent delta (tan δ) and glass transition temperature (T _g). The mechanical properties of films were improved by the addition of the crosslinking agent ADH. Furthermore, the use of polymerizable emulsifier during the preparation of latexes caused an improvement of mechanical properties of the films, in comparison with mechanical properties of the films of latexes which prepared without polymerizable emulsifier.