摘要
熔体破裂中第二光滑区的高速、稳定挤出对于工业应用具有重大的意义 ,着重研究了线形聚乙烯的第二光滑区发生的工艺条件和影响因素 ;以及加入不同种类、份量的碳酸钙 (包括不同处理方法 )后 ,复合材料流变性能的变化。实验证明 ,第二光滑区出现的临界剪切速率 (应力 )随温度的增加而增加 ,随长径比的增加而下降 ;经过表面处理后 ,纳米粒子由于分散均匀 ,熔质差异消除 ,复合材料在第二光滑区可得到平直、光滑的挤出物。揭示了第二光滑区并非由聚合物本构突变引起 。
High speed and stable extrusion of polymer melt in the second smooth section are very important to industry. Processing conditions and influencing factors for the second smooth section of linear polyethylene,as well as changes of rheological behavior of the composite with incorporation of various kinds and loadings of CaCO 3 are studied. Experiments proved that the critical shear rate(or stress)of the second smooth section increased with the increasing of the temperature and decreased with the increasing of the ratio of length to diameter. After being surface treated, nano particles dispersed evenly, thus eleminating the melt difference. With this, straight and smooth extrudate could be got in the second smooth section, implying that the nature of the second smooth section is interfacial, not the constitutive catastrophe of the polymer.
出处
《中国塑料》
CAS
CSCD
北大核心
2003年第6期64-67,共4页
China Plastics
基金
国家自然科学基金重点项目 (2 943 40 10
2 993 40 70 )
国家教育部重点项目资助 (19990 3 )
关键词
线形聚乙烯
熔体破裂
第二光滑区
填充物
linear polyethylene
melt fracture
second smooth section
filler
