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Microstructure of Thermally Crosslinkable Poly(Ethylene Terephthalate) (Pet-co-Xta) Benzocyclobutene Functionalized Copolymers

Published online by Cambridge University Press:  10 February 2011

Brendan J. Foran ,
Elizabeth Pingel ,
Gary E. Spilman ,
Larry J. Markoski ,
Tao Jiang  and
David C. Martin
Brendan J. Foran
Affiliation:
Department of Materials Science and Engineering, University of Michigan, Ann Arbor, MI 48109
Elizabeth Pingel
Affiliation:
Department of Materials Science and Engineering, University of Michigan, Ann Arbor, MI 48109
Gary E. Spilman
Affiliation:
Department of Materials Science and Engineering, University of Michigan, Ann Arbor, MI 48109
Larry J. Markoski
Affiliation:
Department of Materials Science and Engineering, University of Michigan, Ann Arbor, MI 48109
Tao Jiang
Affiliation:
Department of Materials Science and Engineering, University of Michigan, Ann Arbor, MI 48109
David C. Martin
Affiliation:
Department of Materials Science and Engineering, University of Michigan, Ann Arbor, MI 48109
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Abstract

The microstructure and thermal properties of copolymers of polyethylene terephthalate (PET) containing a crosslinkable terephthalic acid, 1,2-dihydrocyc Iobutabenzene 3,6 dicarboxylic acid (XTA) are reported. Wide angle x-ray scattering (WAXS) show that the addition of XTA does not alter the PET crystal structure in copolymers at low XTA contents. However, the degree of crystallinity drops for higher XTA levels. WAXS profiles show that PET-co-XTA 50% is amorphous, and that PEXTA homopolymer has a different crystal structure. Thermal data from DSC and TGA show that crosslinking of the benzocyclobutene groups (∼350°C) occurs at temperatures between melting (∼250°C) and degradation (∼400°C), making it possible to melt process the copolymers into fibers before the onset of crosslinking. Limiting oxygen index (LOI) measurements show that increased oxygen concentrations are required to sustain a stable flame in PET-co-XTA copolymers; whereas unmodified PET had an LOI value of -18%, the copolymers had LOI values near 32%. Further, while unmodified PET melts and drips as it burns, XTA copolymers formed a stable char that inhibiting flame propagation. An increased char was observed in optical micrographs for XTA containing polymers, and crystalline domains were observed near the burn surface in transmission electron micrographs.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 461: Symposia BB – Morphological Control in Multiphase Polymer Mix… , 1996 , 223
Copyright
Copyright © Materials Research Society 1997

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References

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