Polylactide Composite Foams Containing Carbon Nanotubes and Carbon Black: Synergistic Effect of Filler on Electrical Conductivity
writer：Defeng Wu,* Qiaolian Lv, Saihua Feng, Jianxiang Chen, Yang Chen, Yaxin Qi, Xin Yao
keywords：Polylactide; Carbon Nanotubes; Carbon Black; Composite Foams; Conductivity.
source：期刊
specific source：Carbon
Issue time：2015年
Carbon, 2015, 95C, 380-387
ABSTRACT:
Two kinds of
carbonaceous particles, carbon black (CB) and carbon nanotubes (CNTs) were used
as the filler to prepare biodegradable polylactide (PLA) composites for the
study of synergistic effect of fillers on the electrical conductivity. The
results reveal that the CB particles and CNTs are loosely entangled with each
other in PLA matrix, instead of forming two independent phases. Therefore,
there is no synergistic effect of these two fillers, and the ternary composites
containing both the CB and CNTs present electrical conductivity ranged between
those of the CB-based and CNT-based single-filler samples. However, after
foaming with supercritical carbon dioxide, the ternary composite system reveals
evident synergistic effect of fillers because the symbiotic structure between CB and CNTs favors the
formation of the PLA cells with unbroken wall structure, which is propitious to the formation of the conductive filler networks with less defective structure
in PLA bulk. As a result, the
ternary composite foam shows better electrical conductivity than both the
CB-based and CNT-based single-filler foams.
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