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Glycidyl methacrylate-based copolymers as new compatibilizers for polypropylene/ polyethylene terephthalate blends

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Abstract

The improvement of flexural properties of polypropylene (PP) could be achieved by blending it with a stiffer polymer like poly(ethylene terephthalate) (PET). The main problem is the compatibilization between a saturated, apolar structure with a polar polyester. Copolymers of glycidyl methacrylate (GMA) and 2-ethylhexyl acrylate (EHA) were prepared, characterized and used as compatibilizers in PP/PET (70/30 wt%) blends at different feed ratios. The effects of compatibilization of these polymers were analyzed by SEM, which shows reduction of the size of PET granules, and by TGA, with an increase in the thermal stability of the compatibilized blends. Thermal properties corresponding to melting and crystallization events were also changed by the introduction of the compatibilizers. The DMTA shows that the Tg of the PET domain is affected by compatibilization, contrary to the Tg of PP domain. The compatibilization efficiency was further confirmed by an increase in flexural strain at flexural strength (εFM).

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Acknowledgments

The authors acknowledge project Flexmodulo, POCI-01-0247-FEDER-003362 for financial support. The 1H NMR data was collected at the UC-NMR facility which is supported in part by FEDER –European Regional Development Fund through the COMPETE Programme (Operational Programme for Competitiveness) and by National Funds through FCT – Fundação para a Ciência e a Tecnologia (Portuguese Foundation for Science and Technology) through grants REEQ/481/QUI/2006, RECI/QEQ-QFI/0168/2012, CENTRO-07-CT62-FEDER-002012, and Rede Nacional de Ressonância Magnética Nuclear (RNRMN).

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Authors and Affiliations

  1. CEMMPRE, Department of Chemical Engineering, University of Coimbra, Pólo II, Pinhal de Marrocos, 3030-790, Coimbra, Portugal

    Mafalda S. Lima, Áurea A. Matias, João R. C. Costa, Ana C. Fonseca, Jorge F. J. Coelho & Arménio C. Serra

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  1. Mafalda S. Lima
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  2. Áurea A. Matias
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  3. João R. C. Costa
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Correspondence to Arménio C. Serra.

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Lima, M.S., Matias, Á.A., Costa, J.R.C. et al. Glycidyl methacrylate-based copolymers as new compatibilizers for polypropylene/ polyethylene terephthalate blends. J Polym Res 26, 127 (2019). https://doi.org/10.1007/s10965-019-1784-7

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