Abstract
A set of novel biocompatible aliphatic–aromatic nanocomposites, including numerous acrylic acid-grafted poly(butylene carbonate-co-terephthalate) (g-PBCT) and organically-modified layered zinc phenylphosphonate (m-PPZn), were successfully synthesized via polycondensation and transesterification. A primary covalent linkage was produced between the biocompatible polymer and the inorganic reinforcements. Fourier transform infrared spectroscopy and 13C-nuclear magnetic resonance spectra demonstrated the successful grafting of acrylic acid into the PBCT (g-PBCT). Both wide-angle X-ray diffraction data and X-ray photoelectron spectroscopy analysis showed that the g-PBCT polymer matrix was intercalated into the interlayer spacing of the m-PPZn and was chemically interacted with the m-PPZn. The addition of m-PPZn in the g-PBCT matrix significantly improved its storage modulus. A slight increase in thermal stability was observed in all the g-PBCT/m-PPZn composites. Both results are attributed to the presence of covalent bond between g-PBCT and m-PPZn.
Highlights
Biodegradable polymers, such as poly(lactic acid) (PLA) and poly(1,4-butanediol succinate) (PBS), have been commercially utilized to resolve the existing problem of plastic waste accumulation
Both results are attributed to the presence of covalent bond between grafted poly(butylene carbonate-co-terephthalate) (g-poly(butylene carbonate-co-terephthalate) (PBCT)) and modified PPZn (m-PPZn)
The molar ratio of carbonate to terephthalate is very close to the feed ratio of [dimethyl carbonate (DMC)] to [dimethyl terephthalate (DMT)], recommending that the composition of the fabricated PBCT is approximately equal to the calculated composition on the basis of the feed ratio
Summary
Biodegradable polymers, such as poly(lactic acid) (PLA) and poly(1,4-butanediol succinate) (PBS), have been commercially utilized to resolve the existing problem of plastic waste accumulation. The commercial applications of these aliphatic biodegradable polymers are limited owing to their relatively poor physical properties and high costs [1]. The fabricated aliphatic-aromatic poly(butylene adipate-co-terephthalate) (PBAT) copolyester is biodegradable, while the content of the aromatic units is up to 60 mol %. Aliphatic polycarbonates are more feasible candidates for biomedical applications owing to the absence of acidic compounds during its in vivo degradation [5]. The prepared PBCTs consisting of 40–50 mol% aromatic terephthalate units demonstrated thermal properties comparable to commercial compostable aliphatic polyesters such as PLA, PBS, and poly(butylene succinate-co-adipate) (PBSA). Melting temperatures of the PBCT were observed to be in the range of 95146 °C, which could be varied by the content of terephthalate unit with a fast crystallization rate
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