Effect of Sulfur Donor on Properties of Thermoplastic Vulcanizates Based on NR/PP

Chanida Manleh; Charoen Nakason; Natinee Lopattananon; Azizon Kaesaman

doi:10.4028/www.scientific.net/AMR.626.54

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HomeAdvanced Materials ResearchAdvanced Materials Research Vol. 626Effect of Sulfur Donor on Properties of...

Effect of Sulfur Donor on Properties of Thermoplastic Vulcanizates Based on NR/PP

Abstract:

Thermoplastic vulcanizates based on natural rubber and polypropylene blend (NR/PP) was prepared via dynamic vulcanization by melt mixing process at 180°C and a rotor speed of 60 rpm. Three types of vulcanizing agent (i.e., Tetramethyl thiuram disulfide (TMTD), 4,4 Dithiodimorpholine (DTDM) and Dipentamethylene thiuram tetrasulfide (Tetrone A)) were used to cure the rubber phase of NR/PP blends. Influence loading levels of sulfur donor at 1, 2 and 3 phr on dynamic properties and crosslink density were studied. The result showed that the dynamically cured NR/PP blends with Tetrone A gave higher mechanical properties, storage modulus, complex viscosity, and crosslink density with the lower value of tanδ than those of the blends with TMTD and DTDM. Furthermore, the storage modulus, complex viscosity and crosslink density of TPVs increased with increasing loading levels for all types of sulfur donor. It was also found that thermal stability of dynamically cured NR/PP blends is higher than that of the pure NR.