摘要
采用四螺杆挤出机和双螺杆挤出机将PP和UHMWPE挤出共混制成PP/UHMWPE合金,并测试其力学性能,用SEM和DSC对两种共混方式所制备的合金的亚微形态和热性能进行了考察。发现四螺杆挤出机能将UHMWPE均匀地分散在PP基体中,使合金的缺口冲击强度和其它力学性能得到显著的提高,其冲击样条断裂面上呈现细点状结构;同时在合金中,UHMWPE与PP形成共晶结构,并导致UHMWPE熔点下降;表明UHMWPE以准分子水平分散在PP基体中,形成“线性互穿网络”结构。而双螺杆挤出机对PP/UHMWPE合金的共混效果却不佳,所制备的合金的力学性能不能得到有效的提高,冲击样条断口呈现典型的脆性断裂行为;合金中也不存在共晶结构。证明对于PP/UHMWPE合金,四螺杆挤出机比双螺杆挤出机具有更好的共混效果。
In this study,the blends of PP and UHMWPE were prepared by the four-screw extruder and twin-scres extruder,and the mechanical,morphological and thermal properties of these two blends were investigated.For the material blended by the four-screw extruder,a 15% content of UHMWPE corresponded to a maximum Izod impact strength,and its fracture behavior showed a little spots structure inferring a 'linear interpenetrating nework'existed in PP matrix.But the blends prepared by the twin-screw extruder were shown brittleness.A co-crystal structure was found in PP/UHMWPE blends prepared by the four-screw extruder through DSC investigation,and not in that by the twinscrew extruder.Mechanical,morphological and thermal properties demonstrated that melt blending by the four-screw extruder was a better procesing method to PP/UHMWPE blends than that the by twinscrew extruder
出处
《高分子材料科学与工程》
EI
CAS
CSCD
北大核心
1995年第3期69-74,共6页
Polymer Materials Science & Engineering
基金
国家自然科学基金
关键词
挤出机
结构
共混
聚乙烯
力学性质
高聚物合金
s:the four-screw extruder,mechanical property,linear interpenetrating network,cocrystal structure