高密度聚乙烯官能化和增容作用的研究

STUDIES ON FUNCTIONALIZATION OF HIGH DENSITY POLYETHYLENE AND ITS COMPATIBILIZATION EFFECT

通过红外光谱分析、与水的接触角测定、力学性能测定 ,研究了空气中不同环境温度下紫外线辐照对高密度聚乙烯 (HDPE)结构与性能的影响以及紫外辐照官能化 HDPE对 HDPE/聚乙烯醇 (PVA)纤维体系的增容作用。实验结果表明 ,紫外辐照后 ,HDPE分子链上引入了— C(C=O) CH3,— CH2 C(=O) CH2 — ,— C(=O) O—等含氧官能团 ,实现了 HDPE的官能化。提高环境温度可提高 HDPE官能化速度。紫外辐照后 ,HDPE的杨氏模量和拉伸屈服强度提高 ,但断裂伸长率和缺口冲击强度下降。官能化 HDPE对 HDPE/ PVA纤维共混体系有增容作用 。

The effect of the ultraviolet irradiation at different environmental temperatures in air on the structure and properties of high density polyethylene (HDPE) and the compatibilization effect of HDPE functionalized by the ultraviolet irradiation on HDPE/polyvinyl alcohol (PVA)-fiber blend systems are studied through FTIR, surface contact angle measurement with water and mechanical properties test. The results show that -C(C=O)CH3, -CH2C(=O)CH2-, -C(=O)O-oxygen-containing groups are introduced onto the HDPE molecular chain during the ultraviolet irradiation in air. The rate of HDPE functionalization is increased with the rise of the environmental temperature. After the ultraviolet irradiation, the Young's modulus and the tensile yield strength of HDPE are increased; its elongation at break and the notched Izod impact strength are decreased. The proper functionalized HDPE behaves as a compatibilizer in the HDPE/PVA-fiber blend; by adding 5 wt% functionalized HDPE (the irradiation light intensity is 78 W/m2 and the irradiation time is 24 hours) into the HDPE/PVA-fiber (88/12 wt%), the tensile yield strength and the notched Izod impact strength of the blend are increased from 28.3 MPa (HDPE/PVA-fiber: 88/12 wt%) to 30.6 MPa and 130 J/m to 163 J/m respectively.