Coupling carbon fibers to epoxy matrices with grafted side-chain liquid-crystal polymers

Vassoudevane LeBonheur, Samuel I Stupp

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

This work investigated the interfacial adhesion between carbon fibers grafted with liquid-crystalline compounds and an epoxy matrix using the "single-fiber tensile test". The liquid-crystalline monomer and its side-chain liquid-crystalline polymer contain phenolic groups and can therefore bond covalently to both carbon fibers and epoxy matrices. Their mesogenic nature also offers the possibility of forming highly ordered interfacial structures. Epoxy specimens containing a single carbon fiber embedded along their length were loaded in tension and observed in transmission by polarized light microscopy. Both stress birefringence due to plastic shear deformation of the epoxy and the fiber's critical fragmentation length, lc, were measured. Relative to specimens with ungrafted fibers or monomer-grafted fibers, those containing fibers grafted with the self-ordering polymer revealed the greatest plastic deformation in the matrix possibly caused by strong interfacial adhesion. Measurements of critical fragmentation lengths suggest the grafted liquid-crystal polymer causes toughening of the carbon fiber/epoxy interface.

Original languageEnglish
Pages (from-to)1880-1883
Number of pages4
JournalChemistry of Materials
Volume6
Issue number10
Publication statusPublished - 1994

Fingerprint

Liquid crystal polymers
Carbon fibers
Fibers
Plastic deformation
Adhesion
Monomers
Crystalline materials
Toughening
Epoxy Compounds
Liquids
Light polarization
Birefringence
Shear deformation
Optical microscopy
Polymers
carbon fiber
liquid crystal polymer

ASJC Scopus subject areas

  • Materials Chemistry
  • Materials Science(all)

Cite this

Coupling carbon fibers to epoxy matrices with grafted side-chain liquid-crystal polymers. / LeBonheur, Vassoudevane; Stupp, Samuel I.

In: Chemistry of Materials, Vol. 6, No. 10, 1994, p. 1880-1883.

Research output: Contribution to journalArticle

@article{db60934e08d5465998b162e26c6464da,
title = "Coupling carbon fibers to epoxy matrices with grafted side-chain liquid-crystal polymers",
abstract = "This work investigated the interfacial adhesion between carbon fibers grafted with liquid-crystalline compounds and an epoxy matrix using the {"}single-fiber tensile test{"}. The liquid-crystalline monomer and its side-chain liquid-crystalline polymer contain phenolic groups and can therefore bond covalently to both carbon fibers and epoxy matrices. Their mesogenic nature also offers the possibility of forming highly ordered interfacial structures. Epoxy specimens containing a single carbon fiber embedded along their length were loaded in tension and observed in transmission by polarized light microscopy. Both stress birefringence due to plastic shear deformation of the epoxy and the fiber's critical fragmentation length, lc, were measured. Relative to specimens with ungrafted fibers or monomer-grafted fibers, those containing fibers grafted with the self-ordering polymer revealed the greatest plastic deformation in the matrix possibly caused by strong interfacial adhesion. Measurements of critical fragmentation lengths suggest the grafted liquid-crystal polymer causes toughening of the carbon fiber/epoxy interface.",
author = "Vassoudevane LeBonheur and Stupp, {Samuel I}",
year = "1994",
language = "English",
volume = "6",
pages = "1880--1883",
journal = "Chemistry of Materials",
issn = "0897-4756",
publisher = "American Chemical Society",
number = "10",

}

TY - JOUR

T1 - Coupling carbon fibers to epoxy matrices with grafted side-chain liquid-crystal polymers

AU - LeBonheur, Vassoudevane

AU - Stupp, Samuel I

PY - 1994

Y1 - 1994

N2 - This work investigated the interfacial adhesion between carbon fibers grafted with liquid-crystalline compounds and an epoxy matrix using the "single-fiber tensile test". The liquid-crystalline monomer and its side-chain liquid-crystalline polymer contain phenolic groups and can therefore bond covalently to both carbon fibers and epoxy matrices. Their mesogenic nature also offers the possibility of forming highly ordered interfacial structures. Epoxy specimens containing a single carbon fiber embedded along their length were loaded in tension and observed in transmission by polarized light microscopy. Both stress birefringence due to plastic shear deformation of the epoxy and the fiber's critical fragmentation length, lc, were measured. Relative to specimens with ungrafted fibers or monomer-grafted fibers, those containing fibers grafted with the self-ordering polymer revealed the greatest plastic deformation in the matrix possibly caused by strong interfacial adhesion. Measurements of critical fragmentation lengths suggest the grafted liquid-crystal polymer causes toughening of the carbon fiber/epoxy interface.

AB - This work investigated the interfacial adhesion between carbon fibers grafted with liquid-crystalline compounds and an epoxy matrix using the "single-fiber tensile test". The liquid-crystalline monomer and its side-chain liquid-crystalline polymer contain phenolic groups and can therefore bond covalently to both carbon fibers and epoxy matrices. Their mesogenic nature also offers the possibility of forming highly ordered interfacial structures. Epoxy specimens containing a single carbon fiber embedded along their length were loaded in tension and observed in transmission by polarized light microscopy. Both stress birefringence due to plastic shear deformation of the epoxy and the fiber's critical fragmentation length, lc, were measured. Relative to specimens with ungrafted fibers or monomer-grafted fibers, those containing fibers grafted with the self-ordering polymer revealed the greatest plastic deformation in the matrix possibly caused by strong interfacial adhesion. Measurements of critical fragmentation lengths suggest the grafted liquid-crystal polymer causes toughening of the carbon fiber/epoxy interface.

UR - http://www.scopus.com/inward/record.url?scp=4243471788&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=4243471788&partnerID=8YFLogxK

M3 - Article

VL - 6

SP - 1880

EP - 1883

JO - Chemistry of Materials

JF - Chemistry of Materials

SN - 0897-4756

IS - 10

ER -