課題組汪俊陽博士和研究生陽京京等在ACS Appl. Mater. Interfaces發表課題組第143篇論文 (ACS Appl. Mater. Interfaces, 2015, 7 (2), 1364-1375)
More Dominant Shear Flow Effect Assisted by
Added Carbon Nanotubes on Crystallization Kinetics of Isotactic
Polypropylene in Nanocomposites
CAS
Key Laboratory of Soft Matter Chemistry, Department of Polymer Science
and Engineering, Hefei National Laboratory for Physical Sciences at
the Microscale, University of Science and
Technology of China, Hefei, Anhui Province 230026, P. R. China
Provincial
Key Laboratory of Advanced Functional Materials and Devices, Institute
of Polymer Materials and Chemical Engineering, School of Chemistry
and Chemical Engineering, Hefei University
of Technology, Hefei, Anhui Province 230009, P. R. China
ACS Appl. Mater. Interfaces, 2015, 7 (2), pp 1364–1375
DOI: 10.1021/am507938s
Publication Date (Web): January 8, 2015
Copyright © 2015 American Chemical Society
祝賀俊陽和京京！
志剛等在此感謝期刊編輯和三位審稿人對該研究工作的理解，支持以及提出了寶貴的修稿意見！
More
dominant shear flow effect with different shear rates and shear time
with assistance of added carbon nanotubes (CNTs) of low amounts on the
crystallization kinetics of isotactic polypropylene (iPP) in CNT/iPP
nanocomposites was investigated by applying differential scanning
calorimetry (DSC), polarized optical microscopy (POM), and rheometer.
CNTs were chemically modified to improve the dispersity in the iPP
matrix. CNT/iPP nanocomposites with different CNT contents were prepared
by solution blending method. The crystallization kinetics for CNT/iPP
nanocomposites under the quiescent condition studied by DSC indicates
that the addition of CNTs of low amounts significantly accelerates
crystallization of iPP due to heterogeneous nucleating effect of CNTs,
whereas a saturation effect exists at above a critical CNT content. The
shear-induced crystallization behaviors for CNT/iPP nanocomposites
studied by POM and rheometry demonstrate the continuously accelerated
crystallization kinetics with assistance from added CNTs, with
increasing CNT content, shear rate, and shear time, without any
saturation effect. The changes of nucleation density for CNT/iPP
nanocomposites under different shear conditions can be quantified by
using a space-filling modeling from the rheological measurements, and
the results illustrate that the combined effects of added CNTs and shear
flow on the acceleration of crystallization kinetics are not additive,
but synergetic. The mechanisms for the synergetic effect of added CNTs
and shear flow are provided.