Formation of silicone elastomer networks films with gradients in modulus
Formation of silicone elastomer networks films with gradients in modulus
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DOI：
10.1016/j.polymer.2009.11.070
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发表时间：
2010-02-05
期刊：
影响因子：
4.6
通讯作者：
Genzer, Jan
中科院分区：
文献类型：
--
作者：
Crowe-Willoughby, Julie A.;Weiger, Katherine L.;Genzer, Jan
我们描述了具有位置相关模量的软材料基底的形成。在制备此类材料时采用了两种策略。在第一种方法中，我们通过相互扩散两种（或多种）有机硅弹性体（SE）配方来创建模量梯度结构，其中有机硅弹性体（SE）配方包含聚（二甲基硅氧烷）（PDMS）和聚（乙烯基甲基硅氧烷）（PVMS）的混合物，具有不同的分子量和PDMS含量，并将它们热交联以形成SE网络。通过这种方法，所得基材表现出延伸几厘米长度的浅模量梯度。第二种技术基于采用基于紫外线（UV）的跨透明光刻掩模的巯基封端的PVMS链的交联。我们证明，基板上模量的形状和“清晰度”仅取决于掩模对紫外光的位置相关透明度。作为研究的一部分，我们提供了由 PDMS-PVMS 和 PVMS-SH 链形成的网络的详细材料表征。 (C) 2009 Elsevier Ltd. 保留所有权利。
We describe the formation of soft material substrates with position-dependent modulus. Two strategies have been employed in the preparation of such materials. in the first method, we create modulus gradient structures by inter-diffusing two (or more) formulations of silicone elastomers (SE), comprising mixtures of poly(dimethylsiloxane) (PDMS) and poly(vinylmethylsiloxane) (PVMS) with varying molecular weight and content of PDMS, and cross-link them thermally in order to form SE networks. With this method, the resultant substrates exhibit shallow modulus gradients that extend over a few centimeters in length. The second technique is based on employing ultraviolet (UV)-based cross-linking of mercapto-terminated PVMS chains across transparency lithographic masks. We demonstrate that the shape and "sharpness" of the modulus on the substrate depends solely on the position-dependent transparency of the mask to the UV light. As a part of the study we provide detailed material characterization of networks formed by the PDMS-PVMS and PVMS-SH chains. (C) 2009 Elsevier Ltd. All rights reserved.