Synergistic effects of PEG middle-blocks and talcum on crystallizability and thermomechanical properties of flexible PLLA-b-PEG-b-PLLA bioplastic

e-Polymers

Baimark Yodthong¹  Srisuwan Yaowalak¹ 

[1] Department of Chemistry and Centre of Excellence for Innovation in Chemistry, Biodegradable Polymers Research Unit, Faculty of Science, Mahasarakham University, Mahasarakham 44150, Thailand;

关键词: poly(lactic acid);    polyethylene glycol;    block copolymer;    talcum;    nucleating agent;   

DOI  :  10.1515/epoly-2022-0040

来源: DOAJ

【 摘 要 】

In this study, talcum was melt-blended with a flexible poly(l-lactide)-b-polyethylene glycol-b-poly(l-lactide) triblock copolymer (PLLA-PEG-PLLA) with 1, 2, 4, and 8 wt% talcum, for improvement of the crystallization and thermomechanical properties of PLLA-PEG-PLLA compared with PLLA. The crystallizability of PLLA-PEG-PLLA/talcum composites was better than that of PLLA/talcum composites as determined from differential scanning calorimetry. X-ray diffractometry showed that the PLLA-PEG-PLLA/talcum films had a higher degree of crystallinity than the PLLA/talcum films. PEG middle-blocks and talcum showed a synergistic effect for crystallization of PLLA end-blocks. The PLLA-PEG-PLLA/talcum films showed better thermomechanical properties than those of the PLLA/talcum films as determined from dynamic mechanical analysis. This was confirmed from the results of dimensional stability to heat. In summary, the PLLA-PEG-PLLA/talcum composites have potential for use as flexible bioplastics with good dimensional stability to heat.

【 授权许可】

Unknown