Journal
COMPOSITES PART B-ENGINEERING
Volume 207, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.compositesb.2020.108558
Keywords
Polylactic acid; Rigid sugar ring; Interfacial compatibilization; Mechanical properties
Funding
- National Key Research and Development Program of China [2017YFB0306900]
- National Natural Science Foundation of China [51773134]
- Science and Technology Fund for Distinguish Young Scholars of Sichuan Province [2019JDJQ0025]
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Blending polylactide (PLA) with flexible polymers can reduce brittleness but decrease tensile strength. Synthesizing a new bio-based copolyester with specific chemical structures and utilizing dynamic vulcanization result in improved elongation at break and impact strength while maintaining tensile strength.
Blending polylactide (PLA) with flexible polymers is usually capable of reducing its inherent brittleness, which, however, is accompanied with a substantial decrease in tensile strength. Here, considering the integration of flexibility and rigidity, 1,4-butanediol and dodecanedioic acid with flexible alkyl chains as well as isosorbide with a rigid cyclic sugar structure is used to synthesize a new bio-based copolyester. By virtue of interfacial compatibilization between PLA and the copolyester via dicumyl peroxide-induced dynamic vulcanization, well balanced mechanical properties are achieved for resulting blends, that is, elongation at break and notched impact strength are increased to 298.4% and 578.0 J/m that represent 37- and 24-fold increases, while tensile strength maintains at 59.5 MPa that decreases by only similar to 15% compared with that of neat PLA. Massive shear yielding of PLA matrix triggered by internal micro-voids accounts for the toughening mechanism. Given the high mechanical strength and supertoughness, the PLA-based materials have potential applications in different areas.
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