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 language | English |
|---|---|
| Pages (from-to) | 1880-1883 |
| Number of pages | 4 |
| Journal | Chemistry of Materials |
| Volume | 6 |
| Issue number | 10 |
| Publication status | Published - 1994 |
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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 journal › Article
}
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.
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M3 - Article
VL - 6
SP - 1880
EP - 1883
JO - Chemistry of Materials
JF - Chemistry of Materials
SN - 0897-4756
IS - 10
ER -