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Title: Cure shrinkage of thermoset composites

Abstract

The shrinkage of thermoset composites during cure was studied using a volumetric dilatometer. The material systems studied were AS4 carbon fiber/Hercules' 3501-6 epoxy, IM7 carbon fiber/Hercules 8551-7A toughened epoxy and IM7 carbon fiber/BASF's 5250-4 bismaleimide. Shrinkage of the samples due to both polymerization and thermal expansion effects was seen. The volume changes of the materials during cure were then compared to results from dynamic mechanical analysis (DMA) and dielectric cure monitoring. Maximums in volume corresponded to minimums in storage and loss modulus from DMA and maximums in the dielectric loss factor. Resin shrinkage during the 177 deg C (350 F) hold corresponded to the onset of polymerization seen by the rapid increase in the storage modulus and the decrease in the dielectric loss factor response due to reduced ion mobility. These results show that volumetric dilatometry can be an effective tool in the development of materials processing strategies and can be useful in studying residual stresses in composites. 9 refs.

Authors:
 [1]
  1. USAF, Wright Lab., Wright-Patterson AFB, OH (United States)
Publication Date:
OSTI Identifier:
6204988
Resource Type:
Journal Article
Journal Name:
SAMPE Quarterly (Society of Aerospace Material and Process Engineers); (United States)
Additional Journal Information:
Journal Volume: 24:2; Journal ID: ISSN 0036-0821
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; COMPOSITE MATERIALS; CURING; SHRINKAGE; REINFORCED PLASTICS; THERMAL EXPANSION; CARBON FIBERS; ELASTICITY; RESIDUAL STRESSES; EXPANSION; FIBERS; MATERIALS; MECHANICAL PROPERTIES; PETROCHEMICALS; PETROLEUM PRODUCTS; PLASTICS; REINFORCED MATERIALS; STRESSES; SYNTHETIC MATERIALS; TENSILE PROPERTIES; 360601* - Other Materials- Preparation & Manufacture; 360603 - Materials- Properties

Citation Formats

Russell, J D. Cure shrinkage of thermoset composites. United States: N. p., 1993. Web.
Russell, J D. Cure shrinkage of thermoset composites. United States.
Russell, J D. 1993. "Cure shrinkage of thermoset composites". United States.
@article{osti_6204988,
title = {Cure shrinkage of thermoset composites},
author = {Russell, J D},
abstractNote = {The shrinkage of thermoset composites during cure was studied using a volumetric dilatometer. The material systems studied were AS4 carbon fiber/Hercules' 3501-6 epoxy, IM7 carbon fiber/Hercules 8551-7A toughened epoxy and IM7 carbon fiber/BASF's 5250-4 bismaleimide. Shrinkage of the samples due to both polymerization and thermal expansion effects was seen. The volume changes of the materials during cure were then compared to results from dynamic mechanical analysis (DMA) and dielectric cure monitoring. Maximums in volume corresponded to minimums in storage and loss modulus from DMA and maximums in the dielectric loss factor. Resin shrinkage during the 177 deg C (350 F) hold corresponded to the onset of polymerization seen by the rapid increase in the storage modulus and the decrease in the dielectric loss factor response due to reduced ion mobility. These results show that volumetric dilatometry can be an effective tool in the development of materials processing strategies and can be useful in studying residual stresses in composites. 9 refs.},
doi = {},
url = {https://www.osti.gov/biblio/6204988}, journal = {SAMPE Quarterly (Society of Aerospace Material and Process Engineers); (United States)},
issn = {0036-0821},
number = ,
volume = 24:2,
place = {United States},
year = {Fri Jan 01 00:00:00 EST 1993},
month = {Fri Jan 01 00:00:00 EST 1993}
}