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Open AccessArticle

Synthesis, Characterization and Properties of Biodegradable Poly(Butylene Sebacate-Co-terephthalate)

1
Department of Packaging, Yonsei University, Wonju, Gangwon 26493, Korea
2
Department of Agriculture, Forestry and Bioresources, Seoul National University, Seoul 08826, Korea
*
Author to whom correspondence should be addressed.
Polymers 2020, 12(10), 2389; https://doi.org/10.3390/polym12102389
Received: 24 September 2020 / Revised: 10 October 2020 / Accepted: 12 October 2020 / Published: 16 October 2020
(This article belongs to the Section Biomacromolecules, Biobased and Biodegradable Polymers)
In this study, poly(butylene sebacate-co-terephthalate) (PBSeT) was successfully synthesized using various ratios of sebacic acid (Se) and dimethyl terephthalate (DMT). The synthesized PBSeT showed a high molecular weight (Mw, 88,700–154,900 g/mol) and good elastomeric properties. In particular, the PBSeT64 (6:4 sebacic acid/dimethyl terephthalate mole ratio) sample showed an elongation at break value of over 1600%. However, further increasing the DMT content decreased the elongation properties but increased the tensile strength due to the inherent strength of the aromatic unit. The melting point and crystallization temperature were difficult to observe in PBSeT64, indicating that an amorphous copolyester was formed at this mole ratio. Interestingly, wide angle X-ray diffraction (WAXD) curves was shown in the cases of PBSeT46 and PBSeT64, neither the crystal peaks of PBSe nor those of poly(butylene terephthalate) (PBT) are observed, that is, PBSeT64 showed an amorphous form with low crystallinity. The Fourier-transform infrared (FT-IR) spectrum showed C–H peaks at around 2900 cm−1 that reduced as the DMT ratio was increased. Nuclear magnetic resonance (NMR) showed well-resolved peaks split by coupling with the sebacate and DMT moieties. These results highlight that elastomeric PBSeT with high molecular weight could be synthesized by applying DMT monomer and showed promising mechanical properties. View Full-Text
Keywords: biopolymer; biodegradable polyester; aliphatic-aromatic random copolyester biopolymer; biodegradable polyester; aliphatic-aromatic random copolyester
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Kim, S.J.; Kwak, H.W.; Kwon, S.; Jang, H.; Park, S.-I. Synthesis, Characterization and Properties of Biodegradable Poly(Butylene Sebacate-Co-terephthalate). Polymers 2020, 12, 2389.

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