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首页> 外文期刊>Applied Magnetic Resonance >Chain order in filled SBR elastomers: a proton multiple-quantum NMR study
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Chain order in filled SBR elastomers: a proton multiple-quantum NMR study

机译：填充SBR弹性体的链序：质子多量子NMR研究

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摘要

A series of cross-linked styrene-butadiene rubbers (SBR) filled with different amounts of carbon black and silica are investigated by proton multiple-quantum nuclear magnetic resonance (NMR). The method yields reliable information on residual dipolar couplings and their distribution. which in turn are related to local chain order and the effective cross-lint. density in these systems-Fundamental differences between the response of a linear precursor. which undergoes reptational motion, and vulcanized SBR are discussed. For the latter. it is found that the average chain order parameter as well as its distribution does not change significantly with the amount and the type of filler. This is in surprising contrast to recent results front Hahn-echo relaxometry applied to the same samples, which indicated a significant filler effect on the cross-link density.
机译：通过质子多量子核磁共振（NMR）研究了填充有不同数量的炭黑和二氧化硅的一系列交联的丁苯橡胶（SBR）。该方法可提供有关残留偶极耦合及其分布的可靠信息。反过来又与当地的连锁秩序和有效的跨界有关。这些系统中的密度-线性前体的响应之间的基本差异。进行复制运动，并讨论了硫化SBR。对于后者。结果发现，平均链序参数及其分布不会随填料的数量和类型而显着变化。这与最近将Hahn-echo弛豫法应用于相同样品的最新结果形成了鲜明对比，后者表明对交联密度的显着填充作用。

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