Extracting uncrosslinked material from low modulus sylgard 184 and the effect on mechanical properties
Extracting uncrosslinked material from low modulus sylgard 184 and the effect on mechanical properties
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DOI：
10.1002/pol.20190032
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发表时间：
2020-01-15
影响因子：
3.4
通讯作者：
Pham, Jonathan T.
中科院分区：
文献类型：
--
作者：
Glover, Justin D.;McLaughlin, Colbi E.;Pham, Jonathan T.
商业有机硅弹性体因其易于调节的机械性能而常用于软材料研究。然而，模量低于100 kPa的传统聚二甲基硅氧烷（PDMS）弹性体含有未交联的游离分子，这在其行为中起着重要作用。为了利用这些材料，重要的是量化这些游离分子在去除之前和之后在机械响应中发挥的作用。我们提出了一种简单而廉价的提取方法，使自由分子从轻度交联片Sylgard 184，市售的PDMS弹性体的去除。这些材料可以包含大部分自由分子，但在提取后仍保持薄而平坦的几何形状而不会断裂。随后，我们比较了模量，最大拉伸性，和滞后行为的混合比范围从60：1到30：1，提取前后。我们发现，模量，最大拉伸性，和耗散增加提取。此外，我们的方法提供了一种制备交联有机硅弹性体的途径，其模量低至20 kPa，而没有来自市售试剂盒的游离分子。(c)2020 Wiley Periodicals，Inc. J. Polym. Sci. 2020，58，343-351
Commercial silicone elastomers are commonly used in soft materials research due to their easily tunable mechanical properties. However, conventional polydimethylsiloxane (PDMS) elastomers with moduli below similar to 100kPa contain uncrosslinked free molecules, which play a significant role in their behavior. To utilize these materials, it is important to quantify what role these free molecules play in the mechanical response before and after their removal. We present a simple and inexpensive extraction method that enables the removal of free molecules from a lightly crosslinked sheet of Sylgard 184, a commercially available PDMS elastomer. The materials can contain a majority of free molecules yet maintain a thin and flat geometry without fractures after extraction. Subsequently, we compare the modulus, maximum stretchability, and hysteresis behavior with mixing ratios ranging from 60:1 to 30:1, before and after extraction. We show that the modulus, maximum stretchability, and dissipation increase upon extraction. Moreover, our approach offers a route to prepare crosslinked silicone elastomers with a modulus as low as similar to 20kPa without free molecules from a commercially available kit. (c) 2020 Wiley Periodicals, Inc. J. Polym. Sci. 2020, 58, 343-351