Furandicarboxylic acid-lactic acid-diol copolymer and preparation method thereof

Abstract

The invention relates to a furan dioctyl phthalate-lactic acid-dihydric alcohol copolymer and a preparation method thereof. The preparation method comprises the following steps: firstly, preparing oligolactic acid in a lactic acid polymerization mode, subsequently preparing furan dioctyl phthalate dihydric alcohol ester by using furan dioctyl phthalate and dihydric alcohol, and finally copolymerizing the oligolactic acid with the furan dioctyl phthalate dihydric alcohol ester, thereby obtaining a target product, namely, the furan dioctyl phthalate-lactic acid-dihydric alcohol copolymer. The vitrification temperature of the copolymer of the series is 10-90 DEG C, and the weight-average molecular weight is 5000-150000. The copolymer prepared by using the method can be completely degraded, is good in thermal property and mechanical property, and has good application prospect in the fields of degradable plastics, degradable fibers, agricultural plastic mulching films, controlled-released medicine carriers and the like.

Description

technical field [0001] The invention belongs to the technical field of polymer materials, and in particular relates to a furandicarboxylic acid-lactic acid-diol copolymer and a preparation method thereof. Background technique [0002] Bio-based polymer polylactic acid (PLA) is a typical biodegradable material, which has a wide range of applications in the fields of slow-release medicine, artificial bones, surgical sutures, packaging materials, daily-use plastic products, pesticide mulch, textile fibers, etc. However, the glass transition temperature of polylactic acid is low (50-55°C), and its thermal and mechanical properties are not ideal, which restricts its application range. [0003] Therefore, many researchers have carried out research on the modification of polylactic acid. Olewnik et al. used terephthalic acid, lactic acid, and ethylene glycol as substrates to synthesize copolyesters, and improved the thermal and mechanical properties of polylactic acid by introduci...

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Problems solved by technology

Olewnik et al. used terephthalic acid, lactic acid, and ethylene glycol as substrates to synthesize copolyesters, and improved the thermal and mechanical properties of polylactic acid by introducing aromatic rings, but the thermal properties were not significantly improved (the highest glass transition temperature was 62°C). The molecular weight of the polymer is not high (the highest weight-average molecular weight is around 7000) (Ewa Olewnik, Wojciech Czerwinski, Jacek Nowaczyk, et al. Synthesis and structural study of copolymers of L-lactic acid and bis (2-hydroxyethylterephthalate). European Polymer Journal, 2007, 43: 1009-1009-10 Wang et al. Formic acid, lactic acid, and butanediol are copolymerized to obtain copolyesters, and the performance is also not significantly improved (the highest glass transition temperature is 31.5°C) (Bingtao Wang, Yan Zhang, Pingan Song, et al. Biodegradable aliphatic / aromatic copolyesters based on terephthalic acid and poly (L-lactic acid): synthesis, characterization and hydrolytic degradation. ChineseJournalofPolymerScience, 2010,.28 (3): 405-415.), this may be that the conjugation of the benzene ring of terephthalic acid reduces the activity of the carboxylic acid, so that the polymerization requires a higher reaction temperature, and too high The reaction temperature will cause a large amount of lactic acid components to be thermally degraded into lactide, which is not conducive to the synthesis of copolyester

The copolyesters synthesized by Olewnik et al. and Wang et al. have no practical value due to the unsatisfactory glass transition temperature and relative molecular weight.

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