Tensile Strength of Amorphous Gum Rubbers
Tensile Strength of Amorphous Gum Rubbers
复制标题
无定形橡胶的拉伸强度
DOI：
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发表时间：
1963
期刊：
影响因子：
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通讯作者：
T. J. Dudek
中科院分区：
文献类型：
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作者：
F. Bueche;T. J. Dudek
本文提出了一种新的无定形硫化胶在玻璃化温度以上拉伸强度的分子理论，并与最近的实验数据相符合。结果表明，橡胶在断裂时的应力将包括两部分，正常的动力学理论的网络上的应力和高度依赖于速率的应力举行的充分扩展的链。在非平衡试验条件下，轻度交联橡胶在断裂瞬间处于完全伸展状态的链的比例大于高度硫化橡胶。该理论允许计算自由取向单元的分子量。EPR和SBR的合理的值得到支持的有效性所涉及的想法。在高交联无定形纯胶橡胶中，动力学理论应力占断裂应力的主要部分。然而，低交联度的断裂应力主要是由于…
Abstract A new molecular theory of tensile strength has been formulated for amorphous gum vulcanizates at temperatures well above the glass temperature and found to be in agreement with recent experimental data. It is shown that the stress on the rubber at break will consist of two parts, the normal kinetic theory stress on the network and the highly rate dependent stress held by the fully extended chains. The fraction of the chains in the fully extended state at the instant of break is greater for a lightly crosslinked rubber than for a highly vulcanized rubber under nonequilibrium test conditions. The theory allows the molecular weight of the freely orienting unit to be calculated. Reasonable values are obtained for EPR and SBR which lend support to the validity of the ideas involved. The kinetic-theory stress contributes the major portion of the stress at break in highly crosslinked amorphous gum rubbers. However, the stress at break for low degrees of crosslinking is largely the result of stresses in ...