聚合物熔体跨尺度挤出过程的黏弹性流变特性

doi:10.3969/j.issn.1004-132X.2021.12.014

中国机械工程 ›› 2021, Vol. 32 ›› Issue (12): 1494-1503.DOI: 10.3969/j.issn.1004-132X.2021.12.014

聚合物熔体跨尺度挤出过程的黏弹性流变特性

刘奎;王敏杰;赵丹阳;李红霞

大连理工大学机械工程学院，大连，116024

出版日期:2021-06-25 发布日期:2021-07-08
通讯作者: 王敏杰（通信作者），男，1958 年生，教授、博士研究生导师。研究方向为模具技术、高分子材料成形技术、切削加工技术。E-mail:mjwang@dlut.edu.cn。
作者简介:刘奎，男，1993年生，博士研究生。研究方向为微成形理论及高分子材料微挤出成形技术、模具技术。发表论文7篇。E-mail:2280709149@qq.com。
基金资助:
国家自然科学基金（51675079）

Viscoelastic Rheological Properties of Polymer Melts in Cross-scale Extrusion Processes#br#

LIU Kui;WANG Minjie;ZHAO Danyang;LI Hongxia

School of Mechanical Engineering,Dalian University of Technology,Dalian,Liaoning,116024

Online:2021-06-25 Published:2021-07-08

摘要/Abstract

摘要： 在聚合物熔体微尺度动态黏弹特性实验的基础上，基于分子理论建立了跨尺度挤出过程中的熔体黏弹特性微尺度效应流变模型。流变模型反映了流道特征对黏弹性流动过程应力状态的影响。微尺度效应弱化了熔体的黏弹性流变响应，促进了分子链松弛。模型的微尺度效应通过储能模量和耗能模量的微尺度效应系数及二者的比值表征。微尺度效应系数越小，特征尺度对黏弹特性的影响越显著；黏弹性微尺度效应系数比值越小，特征尺度对松弛过程的影响越明显。

关键词: 聚合物熔体, 黏弹性, 跨尺度挤出, 微尺度效应系数, 流变模型

Abstract: A molecular theory-based rheological model was established to describe micro-scale effect on viscoelastic rheological properties through dynamic viscoelastic property measurements under micro-scale conditions. The model might reflect influences of characteristic channels on the stress state of viscoelastic flow processes. The existence of micro-scale effect weakened viscoelastic rheological response of polymer melts and promoted relaxation processes of molecular chains. The micro-scale effect included in the rheological model was characterized by coefficient sizes of micro-scale effect and ratio of storage modulus and loss modulus. A smaller value of the coefficient for the micro-scale effect indicates a more remarkable effect of the characteristic scale on the viscoelastic properties. Smaller ratio of coefficients for viscoelastic micro-scale effect shows an apparent influence of characteristic scale on the relaxation processes.

Key words: polymer melt, viscoelasticity, cross-scale extrusion, coefficient of micro-scale effect, rheological model

中图分类号:

TG76
TQ320

刘奎, 王敏杰, 赵丹阳, 李红霞. 聚合物熔体跨尺度挤出过程的黏弹性流变特性[J]. 中国机械工程, 2021, 32(12): 1494-1503.

LIU Kui, WANG Minjie, ZHAO Danyang, LI Hongxia. Viscoelastic Rheological Properties of Polymer Melts in Cross-scale Extrusion Processes#br#[J]. China Mechanical Engineering, 2021, 32(12): 1494-1503.

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聚合物熔体跨尺度挤出过程的黏弹性流变特性

Viscoelastic Rheological Properties of Polymer Melts in Cross-scale Extrusion Processes#br#

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