ELASTIC-MODULUS AND EQUILIBRIUM SWELLING OF POLY(DIMETHYLSILOXANE) NETWORKS
ELASTIC-MODULUS AND EQUILIBRIUM SWELLING OF POLY(DIMETHYLSILOXANE) NETWORKS
复制标题
DOI：
10.1021/ma00046a021
复制
发表时间：
1992-09-28
期刊：
影响因子：
5.5
通讯作者：
COLBY, RH
中科院分区：
文献类型：
--
作者：
PATEL, SK;MALONE, S;COLBY, RH
通过双功能和单功能聚二甲基硅氧烷（PDMS）与四功能交联剂的末端连接混合物制备了模型聚二甲基硅氧烷（PDMS）网络和含有垂链和支链结构的不完善网络。从动态力学实验中得到的网络的平衡模量值说明了缠结对弹性模量的贡献的重要性。测定了网络在甲苯和苯两种溶剂中的平衡膨胀程度。c*定理的预测不适用于模型网络，因为网络链的广泛穿插导致缠结不能通过膨胀消除。当使用实验测量的弹性模量进行分析时，Flory-Rehner模型和幻影网络模型与膨胀结果吻合较好。
Model poly(dimethylsiloxane) (PDMS) networks and imperfect networks containing pendant chains and branched structures are prepared by end-linking mixtures of di- and monofunctional PDMS and a tetrafunctional cross-linker. Values of the equilibrium modulus of the networks, obtained from dynamic mechanical experiments, illustrate the importance of the entanglement contribution to the elastic modulus. The extents of equilibrium swelling are determined for the networks in two solvents, toluene and benzene. The predictions from the c* theorem do not apply to the model networks due to extensive interspersion of the network chains, which leads to entanglements that are not removed by swelling. The Flory-Rehner model, coupled with the phantom network model gives good agreement with swelling results when the experimentally measured elastic modulus is used in the analysis.