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Preparation of poly(ethylene terephthalate) copolyester with phosphorus-containing comonomer: characterization, thermal behavior, and non-isothermal crystallization kinetics

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Abstract

A series of polyethylene terephthalate-co-[(6-oxido-6H-dibenz[c,e][1,2]oxaphosphorin-6-yl)methyl] butanedioate (PET-co-PEDDP) copolyesters were prepared through the reaction among ethylene glycol (EG), terephthalic acid, and [(6-oxido-6H-dibenz[c,e] oxaphosphorin-6-yl)methyl]butanedioic acid (DDP) through the direct esterification and polycondensation processes. Structure study of the prepared copolyesters using Fourier transform infrared spectroscopy and nuclear magnetic resonance (NMR) indicates polyester production. It is concluded that DDP comonomer incorporated into the polymer chain. Examination of the thermal treatment of all samples detected no phase separation. Melting point linearly decreases with DDP content; the Baur’s equation could describe the melting point. Melt crystallization kinetics of all synthesized samples in a wide range of cooling rates were investigated by various kinetics models. Due to secondary crystallization, some simple models such as the Avrami equation could not fit the data very well. The best crystallization kinetics model was the Hay model by taking into consideration the secondary crystallization, which is the main achievement of this research. Furthermore, the effects of comonomer on the thermal degradation of copolyesters were also analyzed using thermal gravimetry analysis. The Coats–Redfern equation was applied to examine the influence of comonomer on thermal degradation.

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Authors and Affiliations

  1. Polymer Engineering Group, Mahshahr Branch, Department of Polymer Engineering and Color Technology, Amirkabir University of Technology, Tehran, Iran

    Abdollah Sheikh Nezhad Moghadam, Mehdi Rafizadeh & Faramarz Afshar Taromi

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  1. Abdollah Sheikh Nezhad Moghadam
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  2. Mehdi Rafizadeh
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  3. Faramarz Afshar Taromi
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Correspondence to Mehdi Rafizadeh.

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Moghadam, A.S.N., Rafizadeh, M. & Taromi, F.A. Preparation of poly(ethylene terephthalate) copolyester with phosphorus-containing comonomer: characterization, thermal behavior, and non-isothermal crystallization kinetics. Polym. Bull. 80, 8151–8180 (2023). https://doi.org/10.1007/s00289-022-04447-0

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