Rheological properties of high melt strength poly(ethylene terephthalate) formed by reactive extrusion

A reactive extrusion process was developed improving the rheological properties of PET via the coaddition of a dianhydride and polyol. Specifically, the coaddition of pyromellitic dianhydride (PMDA) with pentaerythritol resulted in a gel‐free polyester with superior melt strengths and viscosities co...

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Bibliographic Details
Published in:Journal of applied polymer science 2006-06, Vol.100 (5), p.3646-3652
Main Authors: Forsythe, J. S., Cheah, K., Nisbet, D. R., Gupta, R. K., Lau, A., Donovan, A. R., O'Shea, M. S., Moad, G.
Format: Article
Language:English
Subjects:
Applied sciences
branching
chain extension
Chemical modifications
Chemical reactions and properties
Exact sciences and technology
Organic polymers
pentaerythritol
PET
Physicochemistry of polymers
PMDA
poly(ethylene terephthalate)
reactive extrusion
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Summary:A reactive extrusion process was developed improving the rheological properties of PET via the coaddition of a dianhydride and polyol. Specifically, the coaddition of pyromellitic dianhydride (PMDA) with pentaerythritol resulted in a gel‐free polyester with superior melt strengths and viscosities compared to the addition of PMDA alone. The enhancement in rheological properties were dependent on the relative amounts of dianhydride and polyol with the resultant polyester structurally stable in the melt. These results are consistent with the formation of a hyperbranched polyester with long chain branches. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 100: 3646–3652, 2006
ISSN:0021-8995
1097-4628
DOI:10.1002/app.23166