A mesoscale strength model for silica-filled PDMS

机译：二氧化硅填充PDMS的中尺度强度模型

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We present a mesoscale model that describes the tensile stress of silica-filled polydimethylsiloxane (PDMS) under elongation. Atomistic simulations of a single chain of PDMS, interacting with itself and/or a hydroxylated silica surface provide estimates of the microscopic forces required to stretch or uncoil a chain of PDMS, or detach it from a silica surface Using these results, we develop a mesoscale, inter-particle strength model for uncrosslinked, silica-filled PDMS. The strength model includes these atomistic forces, as determined from the simulations, a small entropic component, and a Gaussian probability distribution to describe the distribution of chain lengths of PDMS strands connecting two silica particles and the chain lengths in the free ends. We obtain an analytic stress/strain expression whose predictions agree with experiment.

机译：我们提出了一种中尺度模型，该模型描述了伸长率下填充二氧化硅的聚二甲基硅氧烷（PDMS）的拉伸应力。 PDMS的单链与其自身和/或羟基化的二氧化硅表面相互作用的原子模拟提供了拉伸或解开PDMS链或将其与二氧化硅表面分离所需的微观力的估计值。使用这些结果，我们开发了中尺度，未交联的填充二氧化硅的PDMS的颗粒间强度模型。强度模型包括通过仿真确定的这些原子力，小的熵分量和高斯概率分布，用于描述连接两个二氧化硅颗粒的PDMS链的链长分布和自由端的链长分布。我们获得了一个解析应力/应变表达式，其预测与实验吻合。

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《Symposium on Filled and Nanocomposite Polymer Materials, Nov 27-30, 2000, Boston, Massachusetts, U.S.A.》|2000年|p.1.2.1-1.2.6|共6页
会议地点 Boston MA(US);Boston MA(US)
作者
D. E. Hanson;
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作者单位

Theoretical Division, Los Alamos National Laboratory Los Alamos, NM, 87545;

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原文格式 PDF
正文语种 eng
中图分类无线电电子学、电信技术;
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A mesoscale strength model for silica-filled PDMS

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