Bibliograph

Viscoelastic properties of alkoxy silane-epoxy interpenetrating networks, by Robert E. Jensen, Steven H. McKnight, and Giuseppe R. Palmese

Type

Label

Viscoelastic properties of alkoxy silane-epoxy interpenetrating networks, by Robert E. Jensen, Steven H. McKnight, and Giuseppe R. Palmese

Language

eng

Bibliography note

Includes bibliographical references (pages 24-26)

resource.governmentPublication

federal national government publication

Illustrations

illustrations

Index

no index present

Literary Form

non fiction

Main title

Viscoelastic properties of alkoxy silane-epoxy interpenetrating networks

Medium

electronic resource

Nature of contents

bibliographydictionaries

Responsibility statement

by Robert E. Jensen, Steven H. McKnight, and Giuseppe R. Palmese

Series statement

ARL-TR, 3109

Summary

A model epoxy-silane interpenetrating network (IPN) was synthesized to simulate the molecular structure found at the fiber-matrix interphase. The Young's modulus (E) of the epoxy-silane IPN was determined% trough micromechanical analysis both quasi-statically and in the frequency domain. The epoxy-silane IPN was synthesized by diffusion of uncured diglycidyl ether of bisphenol A (DGEBA) epoxy resin and bis (p-aminocyclohexyl) methane (PACM) curing agent into spherical particles of condensed and crosslinked 3-glycidoxypropyltrimethoxysilane (GPS). This IPN composition was chosen to simulate the typical properties of a silane modified interphase found in glass reinforced composites. Differential scanning calorimetry showed that the glass transition temperature (Tg) of the initial crosslinked siloxane network increased upon cure of the DGEBA and PACM, but was still significantly lower than that of the neat epoxy matrix. Additionally, dynamic mechanical analysis was used in conjunction with the micromechanical C-Combining Rule to show that the Young's modulus of the epoxy-silane IPN spherical inclusions (E sub i) was decreased in comparison to the Young's modulus of the matrix epoxy (E sub m) at all temperatures. The time-temperature superposition (tTsp) principle was successfully applied to the epoxy-silane IPN to determine viscoelastic properties at high frequencies. The viscoelastic properties of the epoxy-silane IPN may have implications with respect to the ballistic impact resistance of composite structures used for U.S. Army applications

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Creator