线性和长链支化聚乙烯表面不稳定性（“鲨鱼皮”）的比较研究
Comparative investigations of surface instabilities ("sharkskin") of a linear and a long-chain branched polyethylene
摘要：
本文对鲨鱼皮不稳定性的物理根源和机理进行了实验研究。研究了线性低密度聚乙烯（LLDPE）和低密度聚乙烯（LDPE）两种材料通过狭缝口模的挤出流动。通过结合激光多普勒测速仪（LDV）与流变学测量在单轴拉伸和剪切，拉伸和剪切应力的分布在挤出流测量这两种材料。
英文摘要：
An experimental study of the physical origin and the mechanisms of the sharkskin instability is presented. Extrusion flows through a slit die are studied for two materials: a linear low density polyethylene (LLDPE) and a low density polyethylene (LDPE). By combining laser-Doppler velocimetry (LDV) with rheological measurements in both uniaxial extension and shear, the distributions of tensile and shear stresses in extrusion flows are measured for both materials.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
