HDPE/LDPE/SBS高耐应力开裂复合材料亚微相态-力学性能-流变性能的研究(Ⅰ)

Study on sub-micro-phase-mechanical properties-rheological behavior of HDPE/LDPE/SBS high-stress-crack-resistan composite(Ⅰ)

HDPE易受环境的影响产生应力开裂,这限制了其在工业上的应用。本文通过HDPE与SBS,LDPE混合,制得一系列不同组分的高分子合金。分析了其球晶结构和拉伸力学性质并用扫描电镜观察断口形态,并与最终测得的耐环境应力开裂时间进行比较。结果表明,共混体系耐应力开裂性能比纯HDPE有很大提高,而且应力开裂性能与材料的强度和球晶形态密切相关,强度较大且球晶小而不规则者,其耐环境应力开裂性能较好。

HDPE can cause stress cracking easily with affection of environment, which limits its application in industry. A series of HDPE/LDPE/SBS polymer alloy with different contents were prepared by blending. Spherulitic structure and mechanical properties in tension were analyzed, and stress cracking resistant properties were also tested. The result indicated that the stress cracking resistance properties of polymer alloy were greatly improved comparing to pure HDPE, and there was a strong relationship between spherulitic structure, mechanical properties and stress resistant properties. The blends with large strength and small, irregular spherulitic had better stress cracking resistance properties.