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Title: DGEBF epoxy blends for use in the resin impregnation of extremely large composite parts

Abstract

Large superconducting electromagnets used in fusion reactors utilize a large amount of glass/epoxy composite for electrical insulation and mechanical and thermal strengths. Moreover, the manufacture of these magnets involves wrapping each superconducting cable bundle with dry glass cloth followed by the vacuum-assisted resin transfer molding of the entire magnet. Due to their enormous size (more than 100 tons), it requires more than 40 h for resin impregnation and the subsequent pressure cycles to ensure complete impregnation and removal of any trapped air pockets. Diglycidyl ether of bisphenol F epoxy resin cross-linked with methyltetrahydrophthalic anhydride with an accelerator has been shown to be a good candidate for use in composite parts requiring long impregnation cycles. Viscosity, gel time, and glass transition temperature of four resin-blends of diglycidyl ether of bisphenol F resin system were monitored as a function of time and temperature with an objective to find the blend that provides a working window longer than 40h at low viscosity without lowering its glass transition temperature. A resin-blend in the weight ratios of resin:hardener:accelerator=100:82:0.125 is shown to provide more than 60h at low resin viscosity while maintaining the same glass transition temperature as obtained with previously used resin-blends, based on themore » results.« less

Authors:
 [1];  [2]
  1. Univ. of Tennessee, Knoxville, TN (United States)
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1261483
Grant/Contract Number:  
AC05-00OR22725; 4000090977
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Composite Materials
Additional Journal Information:
Journal Volume: 49; Journal Issue: 30; Journal ID: ISSN 0021-9983
Publisher:
SAGE
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; Composites; thermosets; viscosity; glass transition; cure cycle; THERMOSET POLYMER COMPOSITES; CURE-INDUCED STRESSES; CURING KINETICS; SYSTEM; BEHAVIOR; MODELS

Citation Formats

Madhukar, M. S., and Martovetsky, N. N. DGEBF epoxy blends for use in the resin impregnation of extremely large composite parts. United States: N. p., 2015. Web. doi:10.1177/0021998314568332.
Madhukar, M. S., & Martovetsky, N. N. DGEBF epoxy blends for use in the resin impregnation of extremely large composite parts. United States. doi:10.1177/0021998314568332.
Madhukar, M. S., and Martovetsky, N. N. Fri . "DGEBF epoxy blends for use in the resin impregnation of extremely large composite parts". United States. doi:10.1177/0021998314568332. https://www.osti.gov/servlets/purl/1261483.
@article{osti_1261483,
title = {DGEBF epoxy blends for use in the resin impregnation of extremely large composite parts},
author = {Madhukar, M. S. and Martovetsky, N. N.},
abstractNote = {Large superconducting electromagnets used in fusion reactors utilize a large amount of glass/epoxy composite for electrical insulation and mechanical and thermal strengths. Moreover, the manufacture of these magnets involves wrapping each superconducting cable bundle with dry glass cloth followed by the vacuum-assisted resin transfer molding of the entire magnet. Due to their enormous size (more than 100 tons), it requires more than 40 h for resin impregnation and the subsequent pressure cycles to ensure complete impregnation and removal of any trapped air pockets. Diglycidyl ether of bisphenol F epoxy resin cross-linked with methyltetrahydrophthalic anhydride with an accelerator has been shown to be a good candidate for use in composite parts requiring long impregnation cycles. Viscosity, gel time, and glass transition temperature of four resin-blends of diglycidyl ether of bisphenol F resin system were monitored as a function of time and temperature with an objective to find the blend that provides a working window longer than 40h at low viscosity without lowering its glass transition temperature. A resin-blend in the weight ratios of resin:hardener:accelerator=100:82:0.125 is shown to provide more than 60h at low resin viscosity while maintaining the same glass transition temperature as obtained with previously used resin-blends, based on the results.},
doi = {10.1177/0021998314568332},
journal = {Journal of Composite Materials},
number = 30,
volume = 49,
place = {United States},
year = {2015},
month = {1}
}

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