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Vol. 33 No. 9 (2021): Vol 33 Issue 9, 2021

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Thermal and Mechanical Properties of Flexible Poly(L-lactide)-b-polyethylene Glycol-b-poly(L-lactide)/Microcrystalline Cellulose Biocomposites

https://doi.org/10.14233/ajchem.2021.23299
Jenjira Jirum
Biodegradable Polymers Research Unit, Department of Chemistry and Center of Excellence for Innovation in Chemistry, Faculty of Science, Mahasarakham University, Mahasarakham 44150, Thailand
Yodthong Baimark
Biodegradable Polymers Research Unit, Department of Chemistry and Center of Excellence for Innovation in Chemistry, Faculty of Science, Mahasarakham University, Mahasarakham 44150, Thailand

Corresponding Author(s) : Yodthong Baimark

yodthong.b@msu.ac.th

Asian Journal of Chemistry, Vol. 33 No. 9 (2021): Vol 33 Issue 9, 2021

Abstract

In this work, flexible biocomposites were prepared through melt blending using flexible poly(L-lactide)-b-polyethylene glycol-b-poly(L-lactide) (PLLA-PEG-PLLA) as a matrix and microcrystalline cellulose (MCC) as a filler. The effects of the addition of MCC on the thermal, morphological and mechanical properties of PLLA-PEG-PLLA/MCC biocomposites were investigated compared to PLLA/MCC biocomposites. Thermal stability of both PLLA and PLLA-PEG-PLLA from thermogravimetric analysis (TGA) was improved by MCC blending. Scanning electron microscopy (SEM) of the biocomposites exhibited good phase compatibility between PLLA-PEG-PLLA matrix-MCC filler. From tensile tests, the stress and strain at break of the PLLA/MCC and PLLA-PEG-PLLA/MCC biocomposite films decreased while the Young’s modulus increased as the MCC content increased. The strain at break of PLLA-based and PLLA-PEG-PLLA based biocomposite films containing 20 wt.% MCC were 2% and 162%, respectively. Thus, the PLLA-PEG-PLLA/MCC biocomposites have potential to be used as flexible bioplastics for packaging applications.

Keywords

Poly(lactic acid) Block copolymer Microcrystalline cellulose Biocomposites
Jirum, J., & Baimark, Y. (2021). Thermal and Mechanical Properties of Flexible Poly(L-lactide)-b-polyethylene Glycol-b-poly(L-lactide)/Microcrystalline Cellulose Biocomposites. Asian Journal of Chemistry, 33(9), 2135–2142. https://doi.org/10.14233/ajchem.2021.23299
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