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 »
- Authors:
-
- Univ. of Tennessee, Knoxville, TN (United States)
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Publication Date:
- Research Org.:
- Oak Ridge National Laboratory (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. https://doi.org/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. https://doi.org/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 = {Fri Jan 16 00:00:00 EST 2015},
month = {Fri Jan 16 00:00:00 EST 2015}
}
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Works referenced in this record:
Curing kinetics and viscosity change of a two-part epoxy resin during mold filling in resin-transfer molding process
journal, January 2000
- Lee, Chang-Lun; Wei, Kung-Hwa
- Journal of Applied Polymer Science, Vol. 77, Issue 10