Journal
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
Volume 129, Issue -, Pages 1-12Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.ijbiomac.2019.02.006
Keywords
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Funding
- program of Cooperation of Hubei Province and Chinese Academy of Sciences, Jilin Province Science and Technology Agency [20160204030GX]
- program of Changchun Municipal Scientific and Technologic Development [165516]
- Innovation team project of Beijing Institute of Science and Technology [IG201703N]
- 13th five-year Science and Technology Research Program of the Education Department of Jilin Province [JJKH20190862KJ]
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In this work, fully biodegradable poly (lactic acid) (PLA)/poly(3-hydroxybutyrate-co-4-hydroxybutyrate) (P(3HB-co-4HB)) blends of various compositions were uniaxially stretched at different stretch ratios above the glass transition temperature (T-g) of PIA. These stretched blends exhibited a closed microvoid structure, as evaluated by scanning electron microscopy. Differential scanning calorimetry and wide-angle X-ray diffraction analyses verified that stretching-induced crystallization in the alpha-form could be achieved in the PLA matrix. This hierarchical structure could improve the multifunctional performance of PLA blends. The density of drawn blends with a P(3HB-co-4HB) content of 30 wt% and stretch ratio of 6 was reduced by 20% as compared to neat PIA. The excellent combination of strength, modulus, and ductility of drawn blends with a P(3HB-co-4HB) content of 10 wt% and stretch ratio of 6 was demonstrated; compared to neat PLA, these parameters increased by 300%, 320%, and 317%, respectively in breaking strength, modulus, and elongation at break (172.2 MPa, 4200 MPa, and 18.4%), respectively. Meanwhile, control over the degradation rate and thermomechanical-property improvement was achieved by adjusting the stretch ratio and/or blend composition. In practical terms, this processing technique provides a new way to manufacture lightweight and high-performance microvoid-containing biopolymers. (C) 2019 Elsevier B.V. All rights reserved.
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