Compatibilizing Effect of Novolak on Toughness, Crystallite and Morphology of Polyacetal and Nitrile-Butadiene Rubber Blends

Abstract

Abstract: Compatibilizing effect of novolak on toughness, crystallite, and morphology of polyacetal(POM) and nitrile-butadiene(NBR) blends were investigated. It was found the POMand NBRwere immiscible system, and the compatibilization of POMand NBRcould be improved by addition of Novolak. As a result, Izod impact strength increased remarkably. The crystallite morphology of the blends under polarized light microscopy demonstrated that the size of spherulites of POMwas so large as to increase the brittleness of blends. The size of spherulites of POMcould be sharply reduced by mixing with Novolak, which suggested that the inner stress concentration in blends be diminished. POM/NBRblends exhibited a “sea island” morphology, where NBRwas the dispersed phase “sea” and POMwas continuous phase “island”. The morphology of POM/NBR/novolak(mass ratio 60/40/5) blends showed that there was not a “sea island” structure but a physical elastomer network. The elastomer network impeded the growth of craze and promoted the shear deformation of POMmatrix. As a result, a large amount of impact energy could be absorbed and the super toughness was thus obtained.

Key words: POM, NBR, Novolak, Toughness, Crystallite, Morphology

CLC Number:

O631

TrendMD:

WANG Xiao-Dong, ZHANG Qiang . Compatibilizing Effect of Novolak on Toughness, Crystallite and Morphology of Polyacetal and Nitrile-Butadiene Rubber Blends[J]. Chem. J. Chinese Universities, 2001, 22(4): 673.

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Compatibilizing Effect of Novolak on Toughness, Crystallite and Morphology of Polyacetal and Nitrile-Butadiene Rubber Blends

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