Parameters governing strain induced crystallization in filled natural rubber
Parameters governing strain induced crystallization in filled natural rubber
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DOI：
10.1016/j.polymer.2007.09.023
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发表时间：
2007-11-02
期刊：
影响因子：
4.6
通讯作者：
Bomal, Yves
中科院分区：
文献类型：
--
作者：
Chenal, Jean-Marc;Gauthier, Catherine;Bomal, Yves
采用同步辐射X射线衍射法对弱硫化炭黑、高硫化炭黑、白炭黑和接枝白炭黑填充天然橡胶试样进行了拉伸过程的原位研究。与文献相反，在一个拉伸循环后观察到的Mullins效应改变了样品的应变诱导结晶（SIC）行为。结晶的开始是由填料的存在引起的应变放大。此外，填料（CB和二氧化硅）通过填料-橡胶相互作用作为NR网络的额外交联剂，根据NR基质化学交联密度加速或减慢结晶速率。这是一致的假设，有效的网络密度，这是由于化学交联，缠结，和填料-橡胶相互作用，控制结晶速率。(c)2007爱思唯尔有限公司保留所有权利。
A series of in situ synchrotron X-ray diffraction experiments are performed during the stretching of weakly and highly vulcanized carbon black (CB), silica and grafted silica filled natural rubber sample (NR). Conversely to literature, Mullins effect observed after one stretching cycle modifies the strain induced crystallization (SIC) behaviour of the sample. The onset of crystallization is ruled by the strain amplification induced by the filler presence. Moreover, fillers (CB and silica) behave as additional crosslinks into NR network, through filler-rubber interactions that either accelerate or slow down the crystallization rate depending on NR matrix chemical crosslink density. This is consistent with the assumption that effective network density, which is due to chemical crosslinks, entanglements, and filler-rubber interactions, controls the crystallization rate. (c) 2007 Elsevier Ltd. All rights reserved.