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首页> 外文期刊>Journal of Applied Polymer Science >Influence of Crosslinking and Plasticizing on the Viscoelasticity of Highly Filled Elastomers
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Influence of Crosslinking and Plasticizing on the Viscoelasticity of Highly Filled Elastomers

机译：交联和增塑对高填充弹性体粘弹性的影响

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摘要

Solid propellants, like all highly filled elastomers, exhibit a complex nonlinear viscoelastic behavior. The aim of this study was to establish the relationships between the structure and properties, which is needed to construct a robust constitutive law for these materials. An extensive design of experiments approach allowed us to quantify the influence of the curing agents and plasticizer molecules on the microstructure of the propellant and its viscoelastic properties. Swelling and gel permeation chromatography measurements described the microstructure of the propellant and prestrained dynamic mechanical analysis (PDMA) characterized the viscoelastic behavior. The curing agents reacted with polymer chain ends participating in the network, in the sol fraction, or in filler- binder links. Consequently, the polymer network was incomplete even in stoichiometric conditions, and a minimum of 10% of the polymer was free in the microstructure. In addition, preswelling the polymer with plasticizer molecules before curing modified the obtained network by decreasing the crosslink density in the binder and increasing it in the vicinity of the filler surface. This study provided new insight into the local deformation mechanisms controlling nonlinearity as measured by PDMA. The nonlinear behavior appeared between 0 and 1.7% prestrain in both the elastic and viscous parts of the behavior. The network reached its maximum extensibility in the elastic part and constrained the sol fraction in this extended mesh for the viscous part.
机译：像所有高度填充的弹性体一样，固体推进剂表现出复杂的非线性粘弹性行为。这项研究的目的是建立结构与性能之间的关系，这对于构建这些材料的稳健本构定律是必需的。广泛的实验方法设计使我们能够量化固化剂和增塑剂分子对推进剂微观结构及其粘弹性的影响。溶胀和凝胶渗透色谱测量描述了推进剂的微观结构，表征了粘弹性行为的预应变动态力学分析（PDMA）。固化剂与参与网络，溶胶级分或填料-粘合剂链中的聚合物链端反应。因此，即使在化学计量条件下，聚合物网络也不完整，并且至少有10％的聚合物在微观结构中没有。另外，在固化之前用增塑剂分子对聚合物预溶胀通过降低粘合剂中的交联密度并增加其在填料表面附近的交联密度来改性所获得的网络。这项研究为控制PDMA测量的非线性的局部变形机制提供了新的见识。在行为的弹性和粘性部分中，非线性行为都出现在0到1.7％的预应变之间。网络在弹性部分达到其最大可扩展性，并在此扩展网格中限制了粘性部分的溶胶分数。

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