Local Order and Induced Orientation in PDMS Model Networks, Studied by 2H NMR
Local Order and Induced Orientation in PDMS Model Networks, Studied by 2H NMR
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PDMS 模型网络中的局部有序和诱导取向，通过 2H NMR 研究
DOI：
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发表时间：
1998
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通讯作者：
P. Sotta
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文献类型：
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作者：
P. Sotta
2H NMR实验中的一系列聚（二甲基硅氧烷）末端连接的网络。在松弛状态下的2H NMR线的形状由伪固体的贡献，与非零的残留相互作用，和液体的贡献，没有残留的相互作用。液体部分归因于悬挂链。在伪固体部分（弹性链）的残余相互作用的大小进行比较单轴拉伸后诱导的单轴顺序的网络的大小。诱导阶数是通过拉伸时出现的二重态的分裂来测量的。在溶胀平衡时，分裂也与聚合物网络体积分数很好地相关。所有这些量都与网络中有效弹性链的性质有关。悬挂链的存在并不修改先前给出的解释诱导单轴秩序，在一个平均取向场。所提出的分析允许一个估计的强度…
2H NMR experiments in a series of poly(dimethylsiloxane) end-linked networks are presented. The 2H NMR line shape in the relaxed state consists of a pseudo-solid contribution, with nonzero residual interactions, and a liquid contribution, with no residual interactions. The liquid part is attributed to dangling chains. The magnitude of residual interactions in the pseudo-solid part (elastic chains) is compared to the magnitude of the uniaxial order induced upon stretching uniaxially the networks. The induced order is measured by the splitting of the doublet which appears upon stretching. The splitting correlates also well with the polymer network volume fraction at swelling equilibrium. All these quantities are related to the properties of effectively elastic chains in the networks. The presence of dangling chains does not modify the interpretation given previously for the induced uniaxial order, in terms of a mean orientational field. The analysis which is presented allows one to estimate the strength of ...