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BielawskiChristopher W

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Graphite oxide as a carbocatalyst for the preparation of fullerene-reinforced polyester and polyamide nanocomposites

Author(s)
Dreyer, Daniel R.Jarvis, Karalee A.Ferreira, Paulo J.Bielawski, Christopher W.
Issued Date
2012
DOI
10.1039/c2py00545j
URI
https://scholarworks.unist.ac.kr/handle/201301/33163
Fulltext
https://pubs.rsc.org/en/content/articlelanding/2012/PY/c2py00545j#!divAbstract
Citation
POLYMER CHEMISTRY, v.3, no.3, pp.757 - 766
Abstract
Graphite oxide (GO) was discovered to catalyze the ring opening polymerization of various cyclic lactones and lactams, such as 3-caprolactone, delta-valerolactone, and epsilon-caprolactam, to their corresponding polyesters or polyamides. The resulting polymers were obtained in moderate number average molecular weights (4.8-12.8 kDa) and in good to excellent yields (39-100%) at GO loadings ranging from 2.5-20.0 wt%. Using powder X-ray diffraction (PXRD) and transmission electron microscopy (TEM), it was determined that the carbon catalyst was retained and homogeneously dispersed within the polymer product, resulting in the formation of a carbon-filled composite. TEM also revealed that the carbon transitioned from the lamellar morphology found in GO primarily to nanometre-sized, multiwalled fullerenes; no other discrete carbon morphologies were observed. The inclusion of the carbon material in the polyesters was found to improve the mechanical stiffness of the polymers by up to 400%, as compared to the neat homopolymer.
Publisher
ROYAL SOC CHEMISTRY
ISSN
1759-9954
Keyword
RING-OPENING POLYMERIZATIONCARBON-BLACK SURFACEGRAPHENE OXIDECATIONIC POLYMERIZATIONMECHANICAL-PROPERTIESDELTA-VALEROLACTONEPOLY(LACTIC ACID)NANO-ONIONSCATALYSTPOLYCAPROLACTONE

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