Improving the dispersion of multiwalled carbon nanotube in polypropylene using controlled extensional flow

Polímeros

article

Goes, Marcel Andrey de¹  Santos, João Paulo Ferreira²  Carvalho, Benjamim de Melo¹ 

[1] Universidade Estadual de Ponta Grossa;Centro Federal de Educação Tecnológica de Minas Gerais

关键词: processing;    extensional flow;    dispersion;    nanocomposites;   

DOI  :  10.1590/0104-1428.20210116

学科分类：社会科学、人文和艺术（综合）

来源: Brazilian Academy Of Neurology

【 摘 要 】

The use of controlled extension flows associated with processing with predominant shear flows can bring gains in the dispersive capacity of nanofillers during the processing of nanocomposites. In this work, we use a controlled flow device coupled to the matrix of a single-screw extruder to process PP matrix composites containing 0.5% and 2.5% (v/v) of MWCNT. The nanocomposites were evaluated by optical microscopy and oscillatory rheological analysis. The clusters size analysis showed that in PP/0.5MWCNT-el, 70.5% of all its clusters were below 1µm2 while its analog processed without the extensional flow showed 59.8% of its clusters below this value. The rheological analysis allowed to verify that the compositions processed with the presence of the extensional flow have their crossover frequencies shifted to lower values, that is, longer relaxation times corroborating that improved degrees of dispersion were achieved.

【 授权许可】

CC BY