Effect of PC Percentages on Hardness and Notched Impact Strength of PBT/PC Blends

艾氏冲击强度试验 材料科学 聚对苯二甲酸丁二醇酯 聚碳酸酯 复合材料 微观结构 抗冲击性 极限抗拉强度 聚酯纤维
作者
Pham Thi Hong Nga,Nguyen Phuong Duy Tran,Thien Khiem Tran,Thanh Tan Nguyen,Xuan Tien Vo,Ngoc Thien Tran,Van Tron Tran,Minh The Uyen Tran,Van Huong Hoang
出处
期刊:Solid State Phenomena 卷期号:329: 17-22 被引量:3
标识
DOI:10.4028/p-781ca3
摘要

Polybutylene terephthalate (PBT) has been proven to be a potential material for modern car bumpers. However, the potential of PBT is limited by its low notched impact strength. The main aim of this study is the improvement in the notched impact strength of PBT by blending with polycarbonate (PC). PBT/PC blend at different ratios (95/5, 90/10, 85/15, 80/20) is investigated in notched Izod impact strength (ASTM D256) and hardness (ASTM D2240). Results are compared to those of neat PBT. It was found that notched Izod impact strength decreased with increasing PC rate in the blend, overall, from 4.35 kJ/m 2 of neat PBT to 3.37 kJ/m 2 of 80/20 blend. The microstructure of testing samples was observed through FESEM images taken at fracture surfaces to determine the cause of the decrease. The low interfacial adhesion between PBT and PC phases is believed to be the main reason. However, an increase in notched impact strength was shown, from 4.18 kJ/m 2 of 95/5 blend to 4,71 kJ/m 2 of 90/10 blend. This result is presumed to be due to the compatibilizing effect of PBT-PC copolymers formed during the melt blending process. Hardness testing result demonstrates neither significant improvement nor deterioration. It concluded that it is possible to improve the notched impact strength of PBT by blending with PC. The PBT/10% PC blend is a suitable choice for car bumper material since its notch impact strength is higher than neat PBT.
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