聚己内酯的熔体流动性能和挤出胀大  

Flow properties and extrudate swell during extrusion of polycaprolactone melt

作　　者：李凤娇[1] 杨佳[1] 周林[1] 张玉坤[1] 梁基照[1] 

机构地区：[1]华南理工大学机械与汽车工程学院,广东省广州市510640

出　　处：《合成树脂及塑料》2012年第6期58-61,共4页China Synthetic Resin and Plastics

摘　　要：应用熔体流动速率仪,在温度为90～140℃和载荷为2.16～12.50 kg的条件下,考察了温度、表观剪切速率(γα)及管壁剪切应力(τR)对聚己内酯(PCL)熔体流动性能和挤出胀大比(B)的影响。结果表明:在实验条件下,PCL熔体的剪切流动基本服从幂律定律。表观剪切黏度ηa与绝对温度的关系符合Arrhenius方程,ηa随着γa或τR的增加而非线性减小。B随着温度的升高而非线性降低,随着γa或τR的增加而非线性增大,达到最大值后B则下降。The influences of temperature, apparent shear rate（%） and channel wall shear stress （rR） on the flow properties and extrudate swell ratio of polycaprolactone （PCL） melt were studied by means of a melt flow rate instrument under load ranging from 2.16 kg to 12.50 kg at 90-140 ℃. The results show that the shear flow of PCL melt substantially follows the power law under the experimental conditions. The relation between the melt apparent shear viscosity （ηα） and absolute temperature corresponds with the Arrhenius equation; rh values decrease non-linearly with the increase in γα or TR. The extrudate swell ratio （B） reduces non-linearly with the rise in temperature, but increases non-linearly with augment in γα or TR and then declines after reaching its maximum value.

关 键 词：聚己内酯 熔融挤出 流动性能 挤出胀大 

分 类 号：TQ323.6[化学工程—合成树脂塑料工业]