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本文提出橡胶类试样在拉伸条件下发生包括结晶作用的相变为第三级转变。假设理想的熔点在室温附近,每个单体链节呈现出低熔化熵似乎是有利的,这是因为低熔化熵可以促进应力诱导的结晶作用,同时降低温度诱导的结晶作用。低的熔化熵可能是由于在结晶状态下存在着构象无序状态,就像在天然橡胶中一样。
In this paper, we propose that the transformation of the rubber-like specimen including crystallization into the third-order transformation occurs under the tensile conditions. Given the ideal melting point around room temperature, it appears to be advantageous for each monomer chain to exhibit a low melting entropy because low melting entropy can promote stress-induced crystallization while reducing temperature-induced crystallization. The low melting entropy may be due to the conformationally disordered state in the crystalline state, just as in natural rubber.