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将聚丙烯(PP)试样经过室内温差老化、紫外光340 nm和313 nm老化,并对老化前后试样进行力学性能测试、毛细管流变、扫描电镜等分析判断不同老化方法对PP试样老化程度的影响。结果表明,温差20℃时PP试样断裂伸长率保持率为58.7%,温差为100℃时的断裂伸长率保持率降为6.7%;紫外光340 nm老化3 d和20 d的断裂伸长保持率为48.8%和15.3%;紫外光313 nm老化3 d和20 d的断裂伸长保持率为44.6%和3.1%。毛细管流变10min时紫外光340 nm老化3 d和20 d的PP试样与未老化PP试样对比,扭矩由0.188 N·m降为0.168 N·m和0.112N·m;紫外光313 nm则降为0.164 N·m和0.084 N·m。基于此,不同老化方法对PP老化程度不同,其中紫外光313 nm由于其更高的能量使得PP试样的老化程度最大。
Polypropylene (PP) samples were aged through room temperature aging and aged at 340 nm and 313 nm with UV light. The mechanical properties of the samples before and after aging were tested. Capillary rheology and scanning electron microscopy were used to determine the aging behavior of PP samples. Degree of impact. The results show that the retention of elongation at break of PP specimen is 58.7% when the temperature is 20 ℃, the retention of elongation at break is 6.7% when the temperature is 100 ℃, and the elongation at break of elongation is 340% The long-term retention rates were 48.8% and 15.3%, respectively. The elongation at break of 313 nm UV-light at 3 d and 20 d was 44.6% and 3.1%, respectively. Capillary rheology 10min UV light 340 nm aging 3 d and 20 d PP samples compared with un-aged PP samples, torque from 0.188 N · m to 0.168 N · m and 0.112N · m; UV 313 nm Down to 0.164 N · m and 0.084 N · m. Based on this, different aging methods have different degrees of aging on PP, among which UV at 313 nm has the highest degree of aging due to its higher energy.