Abstract
Considering the rising demand to diminish energy consumption and CO2 emissions, the biobased segmented block copolymer, poly(butylene succinate-co-dilinoleic succinate) (PBS-DLS) with 70:30 (wt %) ratio of hard to soft segments was obtain using Candida antarctica lipase B (CAL-B) as a biocatalyst. Throughout two-step synthesis in diphenyl ether, biobased diethyl succinate was polymerized with renewable 1,4–butanediol and dimer linoleic diol to obtain “green” copolyester as a sustainable alternative to petroleum-based materials. Proton nuclear magnetic resonance (1H NMR) analysis confirmed that, using enzyme as a catalyst, we were able to produce multiblock copolymer and gel permeation chromatography (GPC) measurements revealed number-averaged molecular mass to be 25,000 g/mol. Additionally, differential scanning calorimetry (DSC) analysis revealed low-temperature glass transition (Tg) of soft segments and high melting point (Tm) of hard segments which indicate on two-phase morphology. Furthermore, cytotoxicity test using L929 murine fibroblasts was conducted on extracts of obtained PBS-DLS copolymer, indicating excellent biocompatibility in vitro.
Highlights
With the growing environment pollution and energy shortage caused by the petroleum consumption, developing biodegradable polymeric materials from renewable sources has gained a lot of attention [1]
Chemical structure of obtained poly(butylene succinate-co-dilinoleic succinate) (PBS-dilinoleic-succinate soft segments (DLS)) copolyester was verified by nuclear magnetic resonance (NMR)
The appearance of (f), (g), (i), (j), (k), (l) and (e) signals indicating the presence of long aliphatic chains from DLS sequence. 1H NMR analysis confirmed the expected chemical structure of PBS-DLS 70:30 copolyester
Summary
With the growing environment pollution and energy shortage caused by the petroleum consumption, developing biodegradable polymeric materials from renewable sources has gained a lot of attention [1]. Aliphatic polyesters seem to be a good candidate to aim this goal as they can be produced using monomers fully derived from biomass feedstock [2] They are suitable for conventional materials replacement due to the wide range of advantageous features, good mechanical properties and variable transition temperatures, they can be processed by injection moulding or extrusion into different forms. Among this group, segmented block copolyesters are triggering great attention as they consist of different types of building blocks possessing various properties and transition temperatures, being capable of forming hard and soft sequences. With appropriate selection of these building sequences it is possible to manufacture biobased copolyesters with desirable properties and wide spectrum of potential applications such as: fibers, films, scaffolds and drug delivery systems [3,4,5]
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