Effects of magnesium borate on the mechanical performance, thermal and chemical degradation of polyethylene terephthalate packaging material

Demirel B., Kılıç E., Yaraş A., Akkurt F., Daver F., Uğur Gezer D.

JOURNAL OF PLASTIC FILM AND SHEETING, cilt.0, sa.0, ss.1-19, 2022 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 0 Sayı: 0
  • Basım Tarihi: 2022
  • Doi Numarası: 10.1177/87560879221097640
  • Dergi Adı: JOURNAL OF PLASTIC FILM AND SHEETING
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, CAB Abstracts, Compendex, Food Science & Technology Abstracts, INSPEC
  • Sayfa Sayıları: ss.1-19
  • Anahtar Kelimeler: Sol-gel synthesis, magnesium borate, polyethylene terephthalate composite, chemical and thermal degradation, mechanical property
  • Erciyes Üniversitesi Adresli: Evet

Özet

This study is on polyethylene terephthalate (PET) compounded with magnesium borate (MB) (Mg2B2O5) powders between (0.2–3.2% by weight) which were synthesized via solgel technique at laboratory-scale. The MB/PET composites were characterized in terms of chemical, thermal degradation, and mechanical properties. Their phases and chemical structures were identified by X-ray Diffraction and Fourier Transform Infrared analyses. The MB added into PET matrix significantly reduced PET degrading to acetaldehyde, carboxylic acids and diethylene glycol. However, while at 0.2 wt.% MB isophthalic acid (IPA) decreased and at higher MB concentrations there were higher IPA levels. The added MB increased the composites intrinsic viscosity (IV) compared to the pure PET. The highest IV (0.701 dL/g) was at the 0.2 wt.% MB/PET composite. Both Tg and Tm temperatures trended down up to 3.2 wt.% MB. Compared to pure PET, glass transition temperature (Tg) decreased to 80.4°C (at 3.2 wt.% MB) from 81°C, whereas melt temperature (Tm) decreased to 248.5°C (at 3.2 wt.% MB) from 249.4°C. The MB/PET composite tensile strength increased by 11.31% to a 60 MPa maximum at 0.2 wt.% MB compared to neat PET (53.9 MPa). However, at 0.4 wt. % and higher MB the dispersion was insufficient causing the MB powders to aggregate in the PET matrix, resulting in reduced tensile strength.