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【答案】应助回帖
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zb6824785: 金币+50, 翻译EPI+1, ★★★★★最佳答案, 非常非常感谢您的帮助！ 2013-12-24 20:35:50
。少打了一个字母，应该是bound rubber。
Theory of bound rubber
Bound rubber, which is also known as carbon black gel, refers to the rubber that carbon black mix cannot be dissolved by other solvents. Bound rubber is virtually the rubber that adsorbs on the filler surface, namely the rubber in the boundary layer between filler and rubber. The amount of bound rubber is used to measure interaction force between carbon black and rubber. The more the bound rubber is, the higher the enhancement is. Thus, the amount of bound rubber is the measurement of enhancement ability of bound rubber. Based on the original binding model, the researchers combined with the results of stress analysis and put forward a new model theory: the theory of double-layer model of bound rubber. According to the theoretical model, bound rubber that is adsorbing in the periphery of carbon black is composed of 2 layers of rubber layers. However, the structure of these 2 layers has no cross-linkage, and modulus is not equal. The interior layer is vitrified hard layer of polymer, in which polymer is in vitreous state and the polymer molecular motion is restricted. The outer layer is viscous hard layer. Under all strain amplitude, vitrified hard layer on the stress effects is constant value. It just increases the effective diameter, and its performances are similar with the viscous hard layer matrix in the small strain, and the contribution to modulus is not very great. In the case of gradual increase of the stress, the viscous hard layer occurs in orientation, which contributes greatly to the increase of modulus. Due to the limit of activities of molecular chains, the vitrified hard layer does not occur in orientation, which does not play a role in the modulus increase. The viscous hard layer among different particles overlaps at higher amount, so as to form the super network structure. The super network structure will occur in orientation hardening in the large stress and impact modulus changes. Some tiny voids will be formed in the gaps, because the molecular chains are arranged in fascicles. These voids make polymer volume expand under the tensile state, thereby absorbing part of the energy and delaying the destruction rate of molecular chains. In addition, the model theory also has a good explanation of the stress softening phenomenon. |
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