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Vol. 35 No. 7 (2023): Vol 35 Issue 7 (2023)

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Synthesis of Poly(L-lactide)-b-poly(ethylene glycol)-b-poly(L-lactide) Bioplastic with Bio-based Isosorbide Diester

https://doi.org/10.14233/ajchem.2023.27909
Theeraphol Phromsopha
Biodegradable Polymers Research Unit, Department of Chemistry and Centre of Excellence for Innovation in Chemistry, Faculty of Science, Mahasarakham University, Mahasarakham 44150, Thailand
https://orcid.org/0000-0002-1610-8994
Yodthong Baimark
Biodegradable Polymers Research Unit, Department of Chemistry and Centre of Excellence for Innovation in Chemistry, Faculty of Science, Mahasarakham University, Mahasarakham 44150, Thailand
https://orcid.org/0000-0001-8432-8721

Corresponding Author(s) : Yodthong Baimark

yodthong.b@msu.ac.th

Asian Journal of Chemistry, Vol. 35 No. 7 (2023): Vol 35 Issue 7 (2023)

Abstract

In situ chain-extended poly(L-lactide)-b-poly(ethylene glycol)-b-poly(L-lactide) (PLLA-PEG-PLLA) block copolymers synthesized by ring-opening polymerization of L-lactide in the presence of chain extender were more flexible than PLLA. However, flexibility of PLLA-PEG-PLLA requires further improvement to broaden its applications. Herein, plasticization of PLLA-PEG-PLLA with an isosorbide diester bio-based plasticizer (5-20 %wt) is described. PLLA/isosorbide diester blends were also prepared for comparison. The blends prepared via melt blending revealed that isosorbide diester showed good phase compatibility with both the PLLA and PLLA-PEG-PLLA. The addition of isosorbide diester significantly enhanced plastic deformation of cryo-fracture surfaces for PLLA-PEG-PLLA-based blends whereas the plastic deformation was started at 20 %wt isosorbide diester for PLLA-based blends. Crystallization properties and thermal stability of PLLA-PEG-PLLA greatly improved after the addition of isosorbide diester but did not increase the thermal stability for PLLA-based blends. The strains at break of the PLLA-PEG-PLLA-based blends containing 5 %wt, 10 %wt and 20 %wt isosorbide diester were 89.9%, 145.3% and 110.5%, respectively: these were higher than the pure PLLA-PEG-PLLA (59.8%). The plastic deformation, thermal stability and strain at break of the PLLA-PEG-PLLA-based blends increased greatly with content of isosorbide diester, reaching a maximum at 10 %wt isosorbide diester. Therefore, isosorbide diester is promising as a bio-based plasticizer for PLLA-PEG-PLLA to produce highly flexible PLLA-based bioplastics.

Keywords

Poly(lactic acid) Block copolymer Plasticization Crystallization properties Mechanical properties
Phromsopha, T., & Baimark, Y. (2023). Synthesis of Poly(L-lactide)-b-poly(ethylene glycol)-b-poly(L-lactide) Bioplastic with Bio-based Isosorbide Diester. Asian Journal of Chemistry, 35(7), 1625–1631. https://doi.org/10.14233/ajchem.2023.27909
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