EFFECT OF SOLVENT AND CARBON-BLACK SPECIES ON RUBBER-CARBON BLACK INTERACTIONS STUDIED BY PULSED NMR
EFFECT OF SOLVENT AND CARBON-BLACK SPECIES ON RUBBER-CARBON BLACK INTERACTIONS STUDIED BY PULSED NMR
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DOI：
10.1002/pol.1974.180120405
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发表时间：
1974-01-01
影响因子：
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通讯作者：
NISHI, T
中科院分区：
文献类型：
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作者：
NISHI, T
用脉冲核磁共振法测定了不同条件下炭黑与天然橡胶复合材料的自旋-自旋弛豫时间T2和短T2组分的含量。用溶剂（CCl 4）、具有不同表面积的炭黑种类（SAF、HAF、SRF）和不同的初始炭黑加载量（35、50、70 phr）溶胀的效果已经被确定。在橡胶相中的分子运动不是在炭黑表面的紧邻处随着溶剂浓度的增加而迅速增加，但与仅具有溶剂的橡胶相比，它仍然稍微受到限制。另一方面，炭黑周围的固定化层中的分子运动和该层中的部分橡胶不受溶剂的影响。这表明聚合物的分子运动在表面受到强烈的限制。对于固定化层的厚度的估计，使用一个适当的测量表面积的聚合物分子的必要性被指出。层中的固定化程度和层的厚度不随炭黑的性质或炭黑的初始负载而明显变化。
The spin–spin relaxation timeT2and the fraction of shortT2component for composites of natural rubber with carbon black prepared under various conditions have been measured by pulsed NMR. Effect of swelling with a solvent (CCl4), carbon black species (SAF, HAF, SRF) with different surface areas, and different initial carbon black loadings (35, 50, 70 phr) have been determined. Molecular motion in the rubber phase not in the immediate vicinity of the carbon black surface increases rapidly with increasing solvent concentration, yet it is still slightly restricted compared to rubber with solvent alone. On the other hand, molecular motion in the immobilized layer around carbon black and the fraction rubber in that layer are not affected by the solvent. This indicates strong restriction of molecular motion of polymers at the surface. For estimation of the thickness of the immobilized layer, the necessity of using an appropriate measure of surface area accessible to polymer molecules is pointed out. The degree of immobilization in the layer and the thickness of the layer do not vary appreciably with the nature of carbon black or the initial loading of carbon black.