การปรับปรุงสมบัติของยางธรรมชาติวัลคาไนซ์ที่ใช้กลูตารัลดีไฮด์เป็นสารเชื่อมขวาง

Abstract

In this work, improvement of properties of cured NR using GA as curing agent were studied. Optimization of cure condition was investigated systemically. The result suggested that the optimized chemical formulation and cure conditions for vulcanizing natural rubber were 1:1 mole ratio of GA:NH,, 0.9 wt% of ammonia in NR latex, 12 vol% of GA concentration, 50 wt% of total solid content in NR latex and vulcanized of 50 °C for 24 h, exhibited better physical properties. The obtained optimal condition and formulation were used for curing NR-g-PMMAS with different grafting levels and various grafted forms, i.e., NR-g-PMMA, NR-g-PS and NR-g-P(MMA-co-S). It was found that the properties trend to increase with increasing the grafting level and all cured grafted NR forms provided better performance than that of unmodified NR vulcanizate. Moreover, the optimized formulation and condition from this study were also studied in comparison with sulfur cure system (120 °C, 24 h). It was found that the optimized GA cure system provided lower mechanical properties compared to sulfur cured system, but exhibited better thermal properties. This study has some advantages on improving material properties which can be applied for many industrial applications.