Analysis of agglomerate dispersion mechanisms of multiwalled carbon nanotubes during melt mixing in polycarbonate

被引:184
|
作者
Kasaliwal, Gaurav R. [1 ]
Pegel, Sven [1 ]
Goeldel, Andreas [1 ]
Poetschke, Petra [1 ]
Heinrich, Gert [1 ]
机构
[1] Leibniz Inst Polymer Res Dresden, D-01069 Dresden, Germany
关键词
Multiwalled carbon nanotubes; Polymer composites; Dispersion; BLACK; NANOCOMPOSITES; BEHAVIOR; MASTERBATCH; MORPHOLOGY; KINETICS; EROSION; SILICA; FORCE; MODEL;
D O I
10.1016/j.polymer.2010.02.048
中图分类号
O63 [高分子化学(高聚物)];
学科分类号
070305 ; 080501 ; 081704 ;
摘要
Dispersion of primary nanotube agglomerates in polymer melts is one of the difficult tasks when applying melt mixing for nanocomposite preparation. Hence, there is a need for a better understanding of the ongoing processes. Filler agglomerates generally undergo dispersion by rupture and erosion mechanisms, which usually occur simultaneously. To analyse these mechanisms and their corresponding dispersion kinetics 1 wt% multiwalled carbon nanotubes (MWNT) were incorporated into polycarbonate using a microcompounder. Different mixing speeds at constant melt temperature were applied thereby changing the applied stress. The states of MWNT agglomerate dispersion at different mixing times were assessed by quantifying the agglomerate area ratio and particle size distribution using image analysis of optical transmission micrographs. A model is proposed to estimate the fractions of rupture and erosion mechanisms during agglomerate dispersion. At low mixing speeds, the dispersion was found to be governed by both mechanisms, whereas rupture dominance increases with increasing mixing speed. Further, the relationship between electrical resistivity and dispersion was studied indicating a critical behaviour. A dependency on the amount of dispersed nanotubes was found only in a certain range of state of dispersion. (c) 2010 Elsevier Ltd. All rights reserved.
引用
收藏
页码:2708 / 2720
页数:13
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