Enhanced thermal and electrical properties of poly (D,L-lactide)/multi-walled carbon nanotubes composites by in-situ polymerization

Biodegradable poly (D,L-lactide) (PLA)/carboxyl-functionalized multi-walled carbon nanotubes (c-MWCNTs) composites were achieved via in-situ polymerization. These as-prepared composite materials were characterized with FT-IR, XRD, TG, DSC, SEM, and high insulation resistance meter. The results demon...

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Published in:Transactions of Nonferrous Metals Society of China 2013-05, Vol.23 (5), p.1421-1427
Main Authors: LI, Qing-hua, ZHOU, Qin-hua, DENG, Dan, YU, Qiao-zhen, GU, Li, GONG, Ke-da, XU, Ke-hang
Format: Article
Language:English
Subjects:
Dispersions
Electrical conductivity
in-situ polymerization
Insulation
Meters
Multi wall carbon nanotubes
multi-walled carbon nanotubes
Particulate composites
polylactide
Polymer matrix composites
Polymerization
thermal properties
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Summary:Biodegradable poly (D,L-lactide) (PLA)/carboxyl-functionalized multi-walled carbon nanotubes (c-MWCNTs) composites were achieved via in-situ polymerization. These as-prepared composite materials were characterized with FT-IR, XRD, TG, DSC, SEM, and high insulation resistance meter. The results demonstrate that the multi-walled carbon nanotube was carboxyl functionalized, which improved the collection between c-MWCNTs and PLA, and further realized the graft copolymerization of c-MWCNTs and PLA. There is a higher glass transition temperature and a lower pyrolysis temperature of PLA/c-MWCNTs composites than pure PLA. The c-MWCNTs gave a better dispersion than unmodified MWCNTs in the PLA matrix, and an even coating of PLA on the surface of c-MWCNTs was obtained, which increased the interfacial interaction. High insulation resistance analysis showed that the addition of c-MWCNTs increased the electric conductivity, and c-MWCNTs performed against the large dielectric coefficient and electrostatic state of PLA. These results demonstrated that c-MWCNTs modified PLA composites were beneficial for potential application in the development of heat-resisting and conductivity plastic engineering.
ISSN:1003-6326
DOI:10.1016/S1003-6326(13)62612-6