UHMWPE/PP的共混改性研究

【作者】 明艳；

【导师】 贾润礼；

【作者基本信息】 华北工学院 ， 材料学， 2003， 硕士

【摘要】 通过机械共混的方法加工成型了UHMWPE/PP合金。通过比较开炼挤出注射成型和挤出注射成型两种工艺对体系力学性能所产生效果的优劣，选择开炼挤出注射成型工艺进行了全部的实验。在体系中加入自行配制地解缠剂Jc-3，研究了UHMWPE、PP和解缠剂的含量对体系力学性能、流动性能和热学性能的影响。通过DSC、SEM、偏光显微镜等分析手段，对PP/UHMWPE合金的结晶性能、合金冲击断面形状及相结构和微观相畴的分布进行了微观分析。 实验结果表明：随着UHMWPE含量的增加，体系的冲击强度、拉伸强度均有显著地提高，但是，却降低了共混体系的加工性能和热力学性能。解缠剂的加入对UHMWPE的缠结分子链产生了一定的解缠作用。DSC分析说明，体系具有两个独立的熔融吸热峰，分别是PP和UHMWPE组分的贡献，表明体系为两相结构；随着UHMWPE含量的增加，PP的结晶度明显降低，UHMWPE的结晶度则呈现显著地上升趋势，但是由于UHMWPE熔体的粘度极高，UHMWPE的晶体完善程度没有PP的晶体完善程度好。扫描电镜测试表明，UHMWPE和PP共混时，既没有达到分子水平的分散，也不是象刚性粒子或弹性粒子增韧那样，呈颗粒状分布在基体中，而是和PP形成了物理交联网络结构。偏光显微镜测试从微观的角度证明了DSC的测试结果。更多还原

【Abstract】 UHMWPE/PP alloy is molded by mechanical blending process. Mixing-extruding-injecting molding process is chosen to do all experiments by analyzing two different processes, mixing-extruding-injecting molding process and extruding-injecting molding process, influencing on experimental results. Disentanglement agent compounded by ourselves is used, the content of UHMWPE > PP and disentanglement agent influencing on mechanical properties, rheological properties and thermal properties are researched. With Differential Scanning Calorimertric analysis (DSC) , Scanning electron microscopy (SEM) and polarizing microscope et al testing methods, properties of alloys are studied, such as crystallizing properties, impact section appearance of alloy, phase structure and distribution of microstructure.With the content of UHMWPE increasing, the Izod impact strength and tensile strength are improved greatly, but at the cost of rheological properties and thermal properties. The adding of disentanglement agent has effects on disentangling of UHMWPE. DSC testing shows: the system has two independent absorption of heat apexes are the contribution of UHMWPE and PP phase, which declare it is two-phase structure. With the content of UHMWPE increasing, the crystallinity of PP decreases greatly and the crystallinity of UHMWPE improves. But because of poor flowability of UHMWPE, the perfection degree of UHMWPE crystallizing is lower than that of PP; The system is two-phase structure. SEM testing shows: UHMWPE with PP forms" physical cross-linked network", but doesn’t scatter molecularly. Polarizing microscope testifies the results of DSC testing from micromolecular aspect.更多还原