Mechanism of strain-induced crystallization in filled and unfilled natural rubber vulcanizates
Mechanism of strain-induced crystallization in filled and unfilled natural rubber vulcanizates
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DOI：
10.1063/1.1900927
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发表时间：
2005-05-15
影响因子：
3.2
通讯作者：
Hsiao, BS
中科院分区：
文献类型：
--
作者：
Poompradub, S;Tosaka, M;Hsiao, BS
用同步x射线衍射研究了未填充的天然橡胶（NR）硫化胶和填充炭黑或碳酸钙的硫化胶在变形过程中的结构演变。发现掺入填料后结晶起始应变α(0)降低。然而，在填充和未填充试样之间，可变形橡胶部分有效应变比的修正alpha(0)值几乎是恒定的。因此，假设熔融温度与网络链长度(n)无关，我们的未填充NR硫化胶的应变诱导结晶模型适用于填充样品。经典理论与实验结果的差异主要来自于n的分布。填料的加入使横向晶粒尺寸减小，但增加了取向波动。随着名义应力的增大，晶体的晶格几乎呈线性变化。此外，晶格变形程度随填料含量的增加而减小，特别是在炭黑填充体系中。实验结果与所提出的模型一致。(c) 2005年美国物理研究所。
Structure evolution during deformation of unfilled natural rubber (NR) vulcanizate and filled ones with carbon black or calcium carbonate was investigated by the synchrotron x-ray diffraction. The crystallization onset strain, alpha(0), was found to decrease by the inclusion of the filler. However, corrected alpha(0) values into the effective strain ratio of deformable rubber portion were almost constant between filled and unfilled samples. Accordingly, our model of strain-induced crystallization of unfilled NR vulcanizates, assuming that melting temperature is independent of network-chain length (n), was applied to the filled samples. The discrepancy between classical theories and experimental results was thought to come from the distribution of n. By the inclusion of filler, the lateral crystallite size was decreased but the orientational fluctuation increased. The lattice of the strain-induced crystallites changed almost linearly with the nominal stress. In addition, the degree of lattice deformation decreased with the filler content, especially in the carbon black-filled system. All these experimental results are consistent with the proposed model. (c) 2005 American Institute Of Physics.