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In-Situ Polycondensation for Synthesis of Composites of Elastomeric Polymers and Poly(γ-methyl L-glutamate)

Composites of elastomeric polymers and poly(γ-methyl L-glutamate) (PMLG) were prepared by the so-called “in-situ polycondensation method” and a solution blend method. Three types of rubbers were used as matrix polymers : styrene-butadiene copolymer and two derivatives. Mechanical properties of these composite polymers were studied by tensile tests and their morphologies were observed by scanning electron microscopy. The tensile strength and modulus of the composite films obtained by the in-situ polycondensation method increased with increasing PMLG content. Although their tensile modulus values increased drastically, their ultimate elongation values were almost the same. The morphologies of the composites and the reinforcing effect of PMLG were dependent on the preparation method, on the contents of PMLG, and on an interaction between matrix polymer and PMLG.