Properties of natural rubber/poly(vinyl chloride) blends

Cure characteristics, viscosity and mechanical properties of NR/PVC blends cured with peroxide and sulfur, before and after ageing were investigated. Modulus and crosslink density were calculated using experimental stress-str ain curves. Increasing PVC (10-30 phr) in NR/PVC blends cured with sulfur h as shown improvement of most mechanical properties, compared to NR vulcaniz ates. Most mechanical properties in peroxide cured blends are decreased com pared to NR vulcanizates. The heterogenity of NR/PVC blends was determined by dilatometry. NR and PVC show separate T(g)s, which indicate that they ar e not compatible.