摘要
采用低分子量白油溶胀超高分子量聚乙烯(Ultra-high molecular weight polyethylene,UHMWPE),再利用哈普混炼式转矩流变仪熔融共混制备了UHMWPE/PP复合材料。利用差示扫描量热仪研究了UHMWPE溶胀体对PP非等温结晶行为的影响,并分别用Jeziorny、Ozawa和Mo法对数据进行拟合处理。结果表明:复合材料中存在两种晶体,结晶时二者相互竞争,晶体完善程度降低,结晶峰宽化、结晶峰温度降低;UHMWPE溶胀体的加入降低了复合材料的熔体黏度,减弱了PP分子链的运动阻力,材料的结晶速率增大、半结晶时间减小,而Avrami指数未发生明显变化,晶体生长方式未发生改变;UHMWPE溶胀体添加量增大,复合材料的结晶速率先增大后减小;经Kissinger公式理论计算,当UHMWPE含量为1wt%时,复合材料的结晶的活化能相对纯PP减少了16.34kJ/mol,结晶能力增强。
UHMWPE/PP composites were prepared with through swelling Ultra-high molecular weight polyethylene（UHMWPE）with low molecular weight mineral oil and applying melt blending of Harp mixing torque rheometer.The differential scanning calorimeter（DSC）was used to study the influence of UHMWPE swelling on PP nonisothermal crystallization behavior. Meanwhile,Jeziorny equation,Ozawa equation and Mo equation were applied to fit the data.The results show that there were two kinds of crystals in composites which competed with each other during crystallization processes;the degree of the crystals decreased;the crystallization peak widened;the crystallization peak temperature decreased.The addition of UHMWPE swelling reduced the melt viscosity of composites and weakened motion resistance of PP molecular chain;crystallization rate of composites increased,and halfcrystallization duration reduced.The Avrami exponent did not change obviously,and crystal growth pattern did not change.With the increase in the addition amount of UHMWPE swelling,crystallization rate of composites first increased and then decreased.Moreover,the results of Kissinger equation show that the crystallization activation energy of composites was 16.34 kJ/mol lower than that of PP,when the content of UHMWPE in composites was 1 wt%,and the crystallization ability of composites strengthened.
作者
汪凯
张顺花
林启松
WANG Kai;ZHANG Shunhua;LIN Qisong(Silk Institute,College of Materials and Textiles,Zhejiang Sci-Tech University,Hangzhou 310018,China)
出处
《浙江理工大学学报（自然科学版）》
2018年第4期429-435,共7页
Journal of Zhejiang Sci-Tech University(Natural Sciences)
