Design of high-performance poly(L-lactide)/elastomer blends through anchoring carbon nanotubes at the interface with the aid of stereocomplex crystallization
Design of high-performance poly(L-lactide)/elastomer blends through anchoring carbon nanotubes at the interface with the aid of stereocomplex crystallization
复制标题
借助立体络合物结晶将碳纳米管锚定在界面上设计高性能聚（L-丙交酯）/弹性体共混物
DOI：
10.1016/j.polymer.2016.11.034
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发表时间：
2017-01-13
期刊：
影响因子：
4.6
通讯作者：
Fu, Qiang
中科院分区：
文献类型：
--
作者：
Liu, Huili;Bai, Hongwei;Fu, Qiang
纳米粒子在不相容聚合物共混物界面的选择性定位已被证明是一种有效的方法，以改善共混物的性能，甚至提供一些额外的功能。然而，实现纳米颗粒的结晶稳定的界面定位仍然是一个巨大的挑战，主要是由于它们的低界面稳定性以及共混物相之间的高转移速度，特别是对于具有高纵横比的那些。在这项工作中，以聚（D-丙交酯）/聚（D-丙交酯）接枝乙烯-丙烯酸酯共聚物/多壁碳纳米管（PLLA/EGD/MWCNTs）三元复合材料为例，我们描述了一种新的和简单的策略，以解决这一挑战，通过锚定高长径比MWCNTs在PLLA/EGD共混物的界面使用界面局部立体复合物（SC）微晶作为锚定剂。在EGD与PLLA/MWCNTs共混物熔融共混过程中，这种SC微晶可以在共混物界面迅速形成，阻止MWCNTs从不利的PLLA基体向有利的EGD相转移，作为物理屏障，同时部分转移的MWCNTs可以作为成核剂在其表面诱导SC结晶。因此，许多多壁碳纳米管被这些SC微晶牢固地锚定在共混物界面处。锚定的MWCNTs不仅可以作为有效的界面增强剂，显着提高PLLA/EGD共混物的界面强度和冲击韧性，但也使网络状PLLA/EGD共混物中的导电通路的形成在一个低得多的逾渗阈值。这一工作可以提供一个很有前途的机会，通过控制粒子定位在不相容的PLLA共混物的界面上的辅助SC结晶制备高性能和多功能的PLLA基复合材料。(C)2016爱思唯尔有限公司版权所有。
Selective localization of nanoparticles at the interface of immiscible polymer blends has been witnessed as an efficient method to improve blend properties and even provide some added functionalities. Nevertheless, it is still a great challenge to achieve thermodynamically stable interface-localization of the nanoparticles mainly due to their low interfacial stabilities as well as high transfer speeds between the blend phases, especially for those with high aspect ratios. In this work, taking poly(D-lactide)/poly(D-lactide) grafted ethylene-acrylic ester copolymer/multi-walled carbon nanotubes (PLLA/EGD/MWCNTs) ternary composite as an example, we describe a new and facile strategy to address this challenge via anchoring high-aspect-ratio MWCNTs at the interface of PLLA/EGD blends using interface-localized stereocomplex (SC) crystallites as anchoring agents. During melt mixing of EGD with PLLA/MWCNTs mixture, such SC crystallites can be rapidly formed at the blend interface to prevent MWCNTs transferring from the thermodynamically unfavorable PLLA matrix into favorable EGD phase as physical barriers, and meanwhile some of these transferring MWCNTs could serve as nucleating agents to induce SC crystallization on their surfaces. As a result, many MWCNTs are firmly anchored at the blend interface by these SC crystallites. The anchored MWCNTs can not only function as effective interfacial enhancers to remarkably enhance interfacial strength and resulting impact toughness of PLLA/EGD blends but also enable the formation of electrical conductive pathway in the network-like PLLA/EGD blends at a much lower percolation threshold. This wok could offer a promising opportunity for preparing high-performance and multifunctional PLLA-based composites through controlling particle localization at the interface of immiscible PLLA blends with the aid of SC crystallization. (C) 2016 Elsevier Ltd. All rights reserved.