Improving of Properties of Reclaimed Rubber by Mechanical-Chemical Syntheses

摘要

Properties of rubber reclaimed by swelling and mechanical destruction were improved by mechanical-chemical syntheses. Recipes of poly(α-methyl slyrene-co-buladiene) or natural rubber without fillers were used to eliminate their effect. Syntheses were realized by rolling on the first rubber in polymer monomer (styrene) and polymer polymer (natural rubber) binary systems. Syntheses using monomer realized at 60℃ result in polymerization of styrene, while at 20℃ in grafting of polystyrene on rubber and siyrene oligomers. The obtained compounds preserve their elasticity and have increased tensile strength. Syntheses using natural rubber give products with higher tensile strength and elongation at break, due to the compoundation and grafting of natural rubber on the synthetic one. The compound syntheticatural rubber = 3/2 gives, with styrene at 20℃, compounds with higher tensile strength and elongation at break, resistant to crude oil and its derivative. DSC curve of the obtained materials shows an increase of glass transition temperature and a widening of its range, while TGA one a slight increase of temperature at which thermal degradation starts.