Interfacial crowding of nanoplatelets in co-continuous polymer blends: assembly, elasticity and structure of the interfacial nanoparticle network,Soft Matter

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Interfacial crowding of nanoplatelets in co-continuous polymer blends: assembly, elasticity and structure of the interfacial nanoparticle network
Soft Matter ( IF 2.9 ) Pub Date : 2017-08-22 00:00:00 , DOI: 10.1039/c7sm01119a
R. Altobelli _{1,

2,

3,

4,

5} , M. Salzano de Luna _{1,

2,

3,

4,

5} , G. Filippone _{1,

2,

3,

4,

5}

Affiliation

The sequence of events which leads to the interfacial crowding of plate-like nanoparticles in co-continuous polymer blends is investigated through a combination of morphological and rheological analyses. Very low amounts (∼0.2 vol%) of organo-modified clay are sufficient to suppress phase coarsening in a co-continuous polystyrene/poly(methyl methacrylate) blend, while lower particle loading allows for a tuning of the characteristic size of the polymer phases at the μm-scale. In any case, an interfacial network of nanoparticles eventually forms, which is driven by the preferred polymer–polymer interface. The elastic features and stress-bearing ability of this peculiar nanoparticle assembly are studied in detail by means of a descriptive two-phase viscoelastic model, which allows isolation of the contribution of the filler network. The role of the co-continuous matrix in driving the space arrangement of the nanoparticles is emphasized by means of comparative analysis with systems based on the same polymers and nanoparticles, but in which the matrix is either a pure polymer or a blend with drop-in-matrix morphology. The relaxation dynamics of the interfacial network was found not to depend on the matrix microstructure, which instead substantially affects the assembly of the nanoplatelets. When the host medium is co-continuous, the particles align along the preferred polymer–polymer interface, percolating at a very low amount (∼0.17 vol%) and prevalently interacting edge-to-edge. The stress bearing ability of such a network is much higher than that in the case of matrix based on a homogeneous polymer or a drop-in-matrix blend, but its elasticity shows low sensitivity to the filler content.

中文翻译：

共连续聚合物共混物中纳米血小板的界面拥挤：界面纳米粒子网络的组装，弹性和结构

通过形态学和流变学分析的结合，研究了导致连续连续聚合物共混物中板状纳米颗粒界面拥挤的事件顺序。极少量（〜0.2体积％）的有机改性粘土足以抑制共连续聚苯乙烯/聚（甲基丙烯酸甲酯）共混物中的相变粗大，同时较低的颗粒负载量可以调节聚合物相的特征尺寸在微米级。无论如何，最终都会形成纳米颗粒的界面网络，这是由首选的聚合物-聚合物界面驱动的。通过描述性的两相粘弹性模型详细研究了这种特殊的纳米粒子组件的弹性特征和承受应力的能力，该模型可以隔离填料网络的作用。通过使用基于相同聚合物和纳米颗粒的系统进行的比较分析，强调了共连续基质在驱动纳米颗粒空间排列中的作用，但该体系中的基质要么是纯聚合物，要么是带有液滴的共混物-矩阵形态。发现界面网络的弛豫动力学不依赖于基质的微观结构，而是显着影响纳米片的组装。当宿主介质是共连续的时，颗粒会沿着首选的聚合物-聚合物界面排列，并以极低的量（〜0.17体积％）渗透，并普遍地边到边相互作用。这样的网络的压力承受能力比基于均质聚合物或基体掺混物的基质要高得多，

更新日期：2017-09-07

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