期刊
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
卷 163, 期 -, 页码 1175-1186出版社
ELSEVIER
DOI: 10.1016/j.ijbiomac.2020.07.094
关键词
Poly (lactic acid); Multi-walled carbon nanotube; Nanocomposite; Foam; Rheological property
资金
- National Natural Science Foundation of China [51703004, 51703039]
- Top Young Innovative Talents Program of Beijing Municipal University [CITTCD201704041]
- School Level Cultivation Fund of Beijing Technology and Business University for Distinguished and Excellent Young Scholars [BTBUYP2020]
Recently, biodegradable macromolecules have been highly desired as a promising alternative for traditional oil-based plastics to work out the eco crisis and biological health problems triggered by microplastics. Herein, we presented a simple, effective, environmentally friendly and CO2-based foaming methodology for fabricating ultra-low-density poly (lactic acid)/carbon nanotube (PLA/CNTs) nanocomposite foam. By the gradual incorporation of CNTs, three kinds of networks generated in PLA/CNTs nanocomposites and had a distinct reinforcement influence on their melt viscoelasticity, which testified by transmission electron microscope, electrical conductivity and rheological property measurements, severally. Specifically, the storage modulus of PLA/CNTs nanocomposites were 3 orders of magnitude higher in contrast to pure PLA. Interestingly, relative to that under regular differential scanning calorimetry (DSC), a double melting peak phenomenon appeared in the high-pressure DSC curves of diverse PLA specimens. Biodegradable PLA/CNTs nanocomposite foam was successfully fabricated with a super-high volume expansion ratio (VER) of 49.6 times, which could offer a promising strategy for developing other thermoplastic polyester foams with ultra-high VER to obtain some unique functional attributes. (C) 2020 Elsevier B.V. All rights reserved.
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