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Physical structure and topology of elastomers networks

机译：弹性体网络的物理结构和拓扑

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Two groups of chosen models of elastomers networks have been discussed on the basis of literature data and own research results. The first group of models encloses: statistical theory of elasticity, Mooney-Rivlin model, model with constraints on chain and junctions, tube model by Hein-rich, Straube and Helmis as well as Tschoegl model. They use simple experimental measurements of stress-strain dependence. However the concentration of chemical crosslinking joints of network, N_c, and crosslinking efficiency E_c, calculated for NR and IR cured with dicumyl peroxide (DCP) are much higher than the values resulting from the known mechanism of these elastomers curing with a peroxide (E_ct=2) (Table 1, Figs. 3 and 4). In the second groups of models, by Charlesby-Pinner (concerning the rubber showing M_w/M_n approx 2) and by Langley and Pearson (any value of M_w/M_n), there is necessary (for proper analysis) to do labour-consuming determinations of sol content as well as molecular weight and polydispersity of a rubber before curing, but this way determinated values of N_c and E_c, in case of curing NR and IR with DCP [(E_c=1.8-2.0), agree with theoretical values (Table 1)]. These methods can be recommended to complex analysis of physical structure and topology of a network. In networks of cured elastomers there are both the chemical and permanent topological joints. Their part in total number of network joint reaches up to 80% when chemical crosslinking degree is not high.
机译：根据文献数据和自己的研究结果，讨论了两组选择的弹性体网络模型。第一组模型包括：弹性统计理论，Mooney-Rivlin模型，约束链和连接的模型，Hein-rich的管模型，Straube和Helmis以及Tschoegl模型。他们使用简单的应力应变相关性实验测量。但是，对于用过氧化二枯基（DCP）固化的NR和IR计算得出的网络化学交联接头的浓度N_c和交联效率E_c远远高于这些弹性体用过氧化物固化的已知机理所得出的值（E_ct = 2）（表1，图3和4）。在第二组模型中，由Charlesby-Pinner（关于橡胶显示M_w / M_n约为2）以及Langley和Pearson（关于M_w / M_n的任何值）进行模型，需要进行劳动消耗量确定（适当的分析）固化前的溶胶含量​​以及分子量和多分散性的测定，但是用DCP固化NR和IR时，用这种方法确定的N_c和E_c值[（E_c = 1.8-2.0）与理论值一致（表1）]。可以将这些方法推荐用于复杂的网络物理结构和拓扑分析。在固化的弹性体网络中，存在化学和永久拓扑连接。化学交联度不高时，它们在网络接头总数中的比例高达80％。

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