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Polymer Bulletin
Published in: Polymer Bulletin 7/2017

05-11-2016 | Original Paper

The effects of two-step reactive processing on the properties of recycled poly(ethylene terephthalate)

Authors: Kai Wang, Jianhua Qian, Feipeng Lou, Wei Yan, Genhua Wu, Weihong Guo

Published in: Polymer Bulletin | Issue 7/2017

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Abstract

A simple approach for preparing recycled poly(ethylene terephthalate) (r-PET) with excellent processability and melt strength has been developed in this research. To increase the intrinsic viscosity of r-PET, a two-step chain extension process using a combination of SAG-008 and tetraglycidyl-4,4′-diaminodiphenylmethane (TGDDM) was investigated. To evaluate the chain extension degree of the modified r-PET, its intrinsic viscosity (IV) and rheological properties were characterized, and found to be correlated to the long-chain branches and molecular weight. The results indicated that the combination of SAG-008 and TGDDM at the optimized conditions provided the highest IV of 1.18 dl/g while controlling the gel formation to a low value. The increases in storage modulus, loss modulus and complex viscosity revealed the enhancement of melt strength and viscoelasticity of r-PET. The differential scanning calorimetry results showed that the crystallinity was reduced with the addition of chain extenders. On the other hand, stepwise annealing method from room temperature to crystal melting temperature promoted the crystallization, which was confirmed by wide-angle X-ray diffraction measurement.
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Metadata
Title
The effects of two-step reactive processing on the properties of recycled poly(ethylene terephthalate)
Authors
Kai Wang
Jianhua Qian
Feipeng Lou
Wei Yan
Genhua Wu
Weihong Guo
Publication date
05-11-2016
Publisher
Springer Berlin Heidelberg
Published in
Polymer Bulletin / Issue 7/2017
Print ISSN: 0170-0839
Electronic ISSN: 1436-2449
DOI
https://doi.org/10.1007/s00289-016-1850-9

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