Nonisothermal crystallization behavior of highly exfoliated polypropylene/clay nanocomposites prepared by in situ polymerization
Nonisothermal crystallization behavior of highly exfoliated polypropylene/clay nanocomposites prepared by in situ polymerization
复制标题
原位聚合制备高度剥离聚丙烯/粘土纳米复合材料的非等温结晶行为
DOI：
10.1002/app.32335
复制
发表时间：
2011-01
影响因子：
3
通讯作者：
Xin Liu
中科院分区：
文献类型：
--
作者：
Aihua He;Charles C Han;Kai Du;Xin Liu
采用Ziegler-Natta/粘土复合催化剂原位聚合法制备了聚丙烯/粘土纳米复合材料（PPCNs）。广角X射线衍射和透射电子显微镜的结果表明，粘土颗粒在聚丙烯（PP）基体中高度剥离。用差示扫描量热法研究了不同冷却速率下PPCN的非等温结晶动力学。用Dobreva方法计算了成核活性，证明了高度分散的硅酸盐层是有效的成核剂。采用Avrami、Jeziorny、Ozawa和Mo方法对PP和PPCN的非等温结晶行为进行了描述。非等轴晶化的各种参数，如晶化半衰期、晶化速率常数和动力学参数F（t），反映了高度剥离的硅酸盐层由于其突出的成核作用而显著加速了晶化过程。通过Kissinger方法确定的PP和PPCN的活化能值随着纳米硅酸盐层的加入而增加。Wiley Periodicals，Inc. J Appl Polym Sci 119：162- 172，2011
Polypropylene/clay nanocomposites (PPCNs) were prepared via an in situ polymerization method with a Ziegler-Natta/clay compound catalyst in which the MgCl2/TiCl4 catalyst was embedded in the clay galleries. The wide-angle X-ray diffraction and transmission electron microscopy results showed that the clay particles were highly exfoliated in the polypropylene (PP) matrix. The nonisothermal crystallization kinetics of these PPCNs were investigated by differential scanning calorimetry at various cooling rates. The nucleation activity were calculated by Dobreva's method to demonstrate that the highly dis- persed silicate layers acted as effective nucleating agents. The Avrami, Jeziorny, Ozawa, and Mo methods were used to describe the nonisothermal crystallization behavior of the PP and PPCNs. Various parameters of nonisother- mal crystallization, such as the crystallization half-time, crystallization rate constant, and the kinetic parameter F(t), reflected that the highly exfoliated silicate layers sig- nificantly accelerated the crystallization process because of its outstanding nucleation effect. The activation energy values of the PP and PPCNs determined by the Kissinger method increased with the addition of the nanosilicate layers. V C 2010 Wiley Periodicals, Inc. J Appl Polym Sci 119: 162- 172, 2011
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影响因子：
4.6
作者：
Caze, C;Devaux, E;Cavrot, JP
通讯作者：
Cavrot, JP
影响因子：
4.2
作者：
Bae-Hwan Kim;Seung‐Heon Lee;Daewon Lee;Bongwoo Ha;J. Park;K. Char
通讯作者：
Bae-Hwan Kim;Seung‐Heon Lee;Daewon Lee;Bongwoo Ha;J. Park;K. Char
影响因子：
9.4
作者：
Ke Wang;Si Liang;Ping Zhao;C. Qu;Hong Tan;R. Du;Qin Zhang;Q. Fu
通讯作者：
Ke Wang;Si Liang;Ping Zhao;C. Qu;Hong Tan;R. Du;Qin Zhang;Q. Fu
DOI：
10.1002/(sici)1099-0488(19990301)37:5
发表时间：
1999-03
期刊：
Journal of Polymer Science Part B
影响因子：
--
作者：
E. Togawa;T. Kondo
通讯作者：
E. Togawa;T. Kondo
影响因子：
4.6
作者：
Nam, PH;Maiti, P;Usuki, A
通讯作者：
Usuki, A