ผลของอัตราส่วนผสมต่อการดูดซึมน้ำ สมบัติเชิงกลและสมบัติทางความร้อนของพอลิเมอร์ผสมระหว่างไนลอน 6 และพอลิโพรพิลีนโคพอลิเมอร์ / อุดมศักดิ์ พาลี = Compositional effects on water absorption, mechanical and thermal properties of nylon 6 and polypropylene copolymer blends / Udomsak Palee
This research aimed to study the method for improving the impact strength and dimensional stability of nylon 6 by blending nylon 6 with polypropylene copolymer at various compositions using maleic anhydride grafted polypropylene as a compatibilizer. The blends were mixed in the twin screw extruder and then injected for further investigating water absorption, mechanical strength and thermal properties. In non-compatibilizer system, increasing polypropylene copolymer content did not affect thermal properties but resulting in the decreasing of water absorption and mechanical properties. In contrast to the compatibilized blends, the compatibility increased as the amount of compatibilizer increased, as evidenced by the decreasing in size of the dispersed phase. As a result, the mechanical properties, in particular the impact strength, of the blends were improved. Furthermore, the more compatibilizer concentration, the less water absorption, and hence the better the dimensional stability of the blends. For thermal properties, adding the compatibilizer resulted in the decrease in crystallization temperature and degree of crystallinity of the blends. In conclusion, it was found that polymer blends between nylon 6 and polypropylene copolymer at the ratio of 90/10 and 80/20 with 5 and 8 phr of compatibilizer, respectively, exhibited less water absorption than nylon 6 homopolymer, and showed greater mechanical properties than any other blend ratios. Especially for polymer blend of 80% nylon 6/20% polypropylene copolymer with 8 phr compatibilizer, its impact strength was significantly higher than nylon 6.