矩形微通道中PS熔体的流变特性  

Rheological Characteristics of PS Melt in Rectangular Micro-channels

作　　者：于同敏[1] 吴煜[1] 徐华[1] 贝海鑫[1] 梁强[1] 

机构地区：[1]大连理工大学,模塑制品教育部工程研究中心,辽宁大连116023

出　　处：《塑料》2011年第2期19-21,8,共4页Plastics

基　　金：国家自然科学基金项目(50275020);国家重点基础研究发展计划项目(2007CB714502)

摘　　要：使用双料筒毛细管流变仪测试PS熔体在温度为220、240、260℃和剪切速率为500～2万s-1的条件下流经截面为320μm×300μm、500μm×400μm、1 000μm×785μm,长径比不同的矩形口模时的黏度。实验结果表明:在同一温度和剪切速率条件下,熔体黏度随口模截面尺寸减小而减小;随口模长径比增大而增大。将实验黏度值和两种不同的微尺度黏度模型的理论值进行了比较,发现考虑长径比的微尺度黏度模型更能表征矩形微通道中PS熔体的流变特性。A double-barrel capillary rheometer was used to test the viscosity of PS melt flowing through 320μm x 300 μm,500 μm x 400 μm, 1 000 μm x 785μm rectangular dies with different length-diameter ratios under the condition of 220,240,260 ℃ and shear rate from 500 to 20 000 s-1. The results indicated that,for a fixed temperature and shear rate,the smaller the sectional scale of the dies,the smaller the melt viscosity,while the larger the length-diometer ratio of the dies, the higer the melt viscosity. Comparing the experimental viscosity value with the theoretical value of two different micro-scale viscosity models, it was found that the micro-scale viscosity model considering the length-diameter can represent the characteristics of the viscosity of PS melt better.

关 键 词：矩形微通道 长径比 微尺度黏度 高聚物熔体 流变特性 

分 类 号：TQ325.2[化学工程—合成树脂塑料工业]