Prediction of the chemical and thermal shrinkage in a thermoset polymer

被引：63

作者：

Kravchenko, Oleksandr G. ^{[1
]}

Li, Chunyu ^{[2
]}

Strachan, Alejandro ^{[2
]}

Kravchenko, Sergii G. ^{[1
]}

Pipes, R. Byron ^{[3
,4
]}

机构：

[1] Purdue Univ, Sch Aerosp Engn, W Lafayette, IN 47907 USA

[2] Purdue Univ, Sch Mat Engn, Birck Ctr Nanotechnol, W Lafayette, IN 47907 USA

[3] Purdue Univ, Sch Aeronaut & Astronaut, Sch Mat Engn, W Lafayette, IN 47907 USA

[4] Purdue Univ, Sch Chem Engn, W Lafayette, IN 47907 USA

来源：

COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING | 2014年 / 66卷

基金：

美国国家科学基金会;

关键词：

Thermosetting resin; Residual/internal stress; Analytical modeling; Computational modeling; GLASS-TRANSITION TEMPERATURE; MOLECULAR-DYNAMICS SIMULATIONS; RESIDUAL-STRESS BUILDUP; THERMOMECHANICAL RESPONSE; VISCOELASTIC PROPERTIES; EPOXY THERMOSET; CURE KINETICS; RESIN;

D O I：

10.1016/j.compositesa.2014.07.002

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

A multi-scale model for the response of a bi-material "thermostat", consisting of a single unidirectional lamina of carbon/epoxy and an uncured layer of neat diglycidyl ether of bisphenol F (DGEBF) with curing agent, diethyltoluenediamine (DETDA), is developed in order to measure thermal strains during a prescribed, but arbitrary thermal history. Molecular modeling simulations provided the elastic modulus, coefficient of thermal expansion, glass transition temperature of DGEBF/DETDA as a function of degree of cure. Cure kinetic properties were determined with differential scanning calorimeter measurements. The model allowed separation of strains due to cure shrinkage and thermal expansion. Combining the molecular modeling predictions, cure kinetic measurements and "thermostat" deflection measurements, the complete polymer shrinkage phenomenon is determined over a prescribed thermal cycle. Furthermore, this work can provide a vehicle to develop cure cycles wherein the difference between instantaneous glass transition temperature and specimen temperature is controlled to provide optimum cure cycles for minimum cure shrinkage. (C) 2014 Elsevier Ltd. All rights reserved.

引用

页码：35 / 43

页数：9

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