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Isostructural softening of vulcanized nanocomposites.
Soft Matter ( IF 2.9 ) Pub Date : 2020/01/28 , DOI: 10.1039/c9sm02442e Guilhem P Baeza 1 , Florent Dalmas 1 , Fabien Dutertre 2 , Jean-Charles Majesté 2
Soft Matter ( IF 2.9 ) Pub Date : 2020/01/28 , DOI: 10.1039/c9sm02442e Guilhem P Baeza 1 , Florent Dalmas 1 , Fabien Dutertre 2 , Jean-Charles Majesté 2
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Following previous work evidencing that short poly-propylene glycol (PPG) chains incorporated into crude SBR/silica nanocomposites act as filler-network softeners without changing their structure, we propose in the present report to examine more operative cross-linked materials. We first evidence that the adsorption of PPG onto silica deactivates progressively the particle's catalytic effect on vulcanization, without perturbing however the cross-link density distribution that we investigate through multiple-quantum NMR. In addition, electron microscopy confirms that the silica structure is conserved after vulcanization and that it does not depend on the PPG content either. Composites containing various amounts of PPG can thus be seen as structurally identical, both from a matrix and filler point of view - which is confirmed by small and medium amplitude oscillation shear rheology showing strikingly identical viscoelastic properties. The PPG signature only appears above 100% in tensile deformation where it is observed to soften dramatically the filler network. Our discovery makes it consequently possible to decorrelate the mechanical behavior of reinforced rubbers under normal conditions of use and urgent needs of energy dissipation.
中文翻译：
硫化纳米复合材料的同构软化。
在先前的工作证明掺入粗SBR /二氧化硅纳米复合材料中的短聚丙二醇（PPG）链充当填充剂网络软化剂而不改变其结构之后，我们在本报告中建议研究更有效的交联材料。我们首先证明，PPG在二氧化硅上的吸附会逐渐使颗粒对硫化的催化作用失活，而不会干扰我们通过多量子NMR研究的交联密度分布。另外，电子显微镜确认了在硫化后二氧化硅结构是保守的，并且它也不取决于PPG的含量。因此，可以将含有各种PPG的复合材料视为在结构上相同，从基体和填料的角度来看，这都得到了中小振幅振荡剪切流变学的证实，显示出惊人的相同的粘弹性。PPG签名仅在拉伸变形中超过100％时出现，观察到它会显着软化填料网络。因此，我们的发现使得在正常使用条件和迫切的耗能需求下增强橡胶的机械性能成为可能。
更新日期：2020-04-01
中文翻译：
硫化纳米复合材料的同构软化。
在先前的工作证明掺入粗SBR /二氧化硅纳米复合材料中的短聚丙二醇（PPG）链充当填充剂网络软化剂而不改变其结构之后，我们在本报告中建议研究更有效的交联材料。我们首先证明，PPG在二氧化硅上的吸附会逐渐使颗粒对硫化的催化作用失活，而不会干扰我们通过多量子NMR研究的交联密度分布。另外，电子显微镜确认了在硫化后二氧化硅结构是保守的，并且它也不取决于PPG的含量。因此，可以将含有各种PPG的复合材料视为在结构上相同，从基体和填料的角度来看，这都得到了中小振幅振荡剪切流变学的证实，显示出惊人的相同的粘弹性。PPG签名仅在拉伸变形中超过100％时出现，观察到它会显着软化填料网络。因此，我们的发现使得在正常使用条件和迫切的耗能需求下增强橡胶的机械性能成为可能。
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