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Record Details

Record 38 of 4808
Physical aging in graphite/epoxy composites
Author and Affiliation:
Kong, E. S. W.(Stanford University, Stanford, CA, United States)
Abstract: Sub-Tg annealing has been found to affect the properties of graphite/epoxy composites. The network epoxy studied was based on the chemistry of tetraglycidyl 4,4'-diamino-diphenyl methane (TGDDM) crosslinked by 4,4'-diamino-diphenyl sulfone (DDS). Differential scanning calorimetry, thermal mechanical analysis, and solid-state cross-polarized magic-angle-spinning nuclear magnetic resonance spectroscopy have been utilized in order to characterize this process of recovery towards thermodynamic equilibrium. The volume and enthalpy recovery as well as the 'thermoreversibility' aspects of the physical aging are discussed. This nonequilibrium and time-dependent behavior of network epoxies are considered in view of the increasingly wide applications of TGDDM-DDS epoxies as matrix materials of structural composites in the aerospace industry.
Publication Date: Jan 01, 1983
Document ID:
19840034376
(Acquired Nov 28, 1995)
Accession Number: 84A17163
Subject Category: COMPOSITE MATERIALS
Document Type: Conference Paper
Publication Information: (SEE A84-17101 05-23)
Publisher Information: United States
Contract/Grant/Task Num: NSF CHE-79-16324; NCC2-103
Financial Sponsor: NASA; United States
Organization Source: Stanford Univ.; CA, United States
Description: 13p; In English
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: Copyright
NASA Terms: AGING (MATERIALS); ANNEALING; FIBER COMPOSITES; GRAPHITE-EPOXY COMPOSITES; ENTHALPY; MECHANICAL PROPERTIES; NUCLEAR MAGNETIC RESONANCE; QUENCHING; THERMAL EXPANSION
Imprint And Other Notes: IN: Materials and processes - Continuing innovations; Proceedings of the Twenty-eighth National SAMPE Symposium and Exhibition, Anaheim, CA, April 12-14, 1983 (A84-17101 05-23). Azusa, CA, Society for the Advancement of Material and Process Engineering, 1983, p. 838-850.
Availability Source: Other Sources
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