Melt rheology of polylactide/montmorillonite nanocomposites
Melt rheology of polylactide/montmorillonite nanocomposites
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DOI：
10.1002/polb.21317
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发表时间：
2007-12-01
影响因子：
--
通讯作者：
Dong, Bo
中科院分区：
文献类型：
--
作者：
Gu, Shili-Ying;Ren, Jie;Dong, Bo
用先进的流变学膨胀系统流变仪研究了聚乳酸/粘土(有机蒙脱土)纳米复合材料(PLACNs)的线性和非线性剪切流变行为。以聚己内酯(PCL)为相容剂，在双螺杆挤出机上采用母料法制备纳米复合材料。有机蒙脱土的存在使纳米复合材料熔体具有明显的类固相行为。形成“渗流网络”的行为源于强相关片状粒子之间的相互作用。因此，PLACNs的储能模数、损耗模数和动态粘度随蒙脱土含量的增加而单调增加。PLACNs纳米复合材料中存在非末端行为。此外，由于蒙脱土的择优取向，PLACNs熔体比纯的聚乳酸熔体表现出更大的剪切变薄趋势。因此，与纯的聚乳酸相比，PLACNs具有更高的模数和更好的加工性能。(C)2007年威利期刊公司。
In this article, the linear and nonlinear shear rheological behaviors of polylactide (PLA)/clay (organophilic-montmorillonite) nanocomposites (PLACNs) were investigated by an Advanced Rheology Expanded System rheometer. The nanocomposites were prepared by master batch method using a twin-screw extruder with poly(epsilon-caprolactone) (PCL) as a compatibilizer. The presence of org-MMT leads to obvious pseudo-solid-like behaviors of nanocomposite melts. The behaviors caused by the formation of a "percolating network" derived from the reciprocity among the strong related sheet particles. Therefore, the storage moduli, loss moduli, and dynamic viscosities of PLACNs show a monotonic increase with MMT content. Nonterminal behaviors exists in PLACNs nanocomposites. Besides the PLACNs melts show a greater shear thinning tendency than pure PLA melt because of the preferential orientation of the MMT layers. Therefore, PLACNs have higher moduli but better processibility compared with pure PLA. (c) 2007 Wiley Periodicals, Inc.