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首页> 外文期刊>Journal of Applied Polymer Science >Structure of natural rubber/emulsion butadiene rubber (NR/EBR) vulcanizates
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Structure of natural rubber/emulsion butadiene rubber (NR/EBR) vulcanizates

机译：天然橡胶/丁苯橡胶（NR / EBR）硫化胶的结构

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Diblock amorphous topological structure of a filled vulcanizate network made of natural rubber (NR) and Emulsion Butadiene Rubber (EBR) was found. These blocks differ in the transition temperatures about 200 degrees C. Dual transitions of such rubbers have been assigned as a motion of the mixed soft block [low glass transition temperature (T-g)] in the glassy state and the motion in elements of a network around physical and chemical crosslinking sites in a rigid block (high T-g), respectively. Compaction of the topological structure of a high-temperature block during curing (manifested by the growth of T-g) was noticed. The molecular weight distribution of the chains between the junctions of the network and shares of these amorphous blocks in the structure of the rubber network vs curing time were calculated using the methodology shown. Introduction of Perkalink 900 at constant quantity of sulfur changes a structure of the junctions in the tested rubber network from mixed (10-15% of chemical bonds, and remaining are cluster type and topological junctions) into practically all chemical bonds. Optimal curing time evaluated by the thermomechanical analysis, at which molecular structures formed in both blocks reflect the equilibrium state of adsorption layers of two rubbers introduced into the compound, is close to that evaluated by the vulcametric tests. The location of the molecular weight distribution curve in both blocks one against another depends on rubber formulation. Also, a fact that crosslinks are gathered, as was predicted by Vilgis and Heinrich calculations, was confirmed experimentally. (C) 2000 John Wiley & Sons, Inc. [References: 32]
机译：发现了由天然橡胶（NR）和乳液丁二烯橡胶（EBR）制成的填充硫化橡胶网络的二嵌段无定形拓扑结构。这些嵌段的转变温度大约为200摄氏度。这种橡胶的双重转变被指定为混合软嵌段在玻璃态下的运动[低玻璃化转变温度（Tg）]和周围网络中元素的运动。刚性嵌段（高Tg）中的物理和化学交联部位。注意到固化期间高温块的拓扑结构的压实（表现为T-g的增长）。使用所示方法计算橡胶网络结构中网络连接点之间的链的分子量分布以及这些无定形嵌段的份额与固化时间的关系。以恒定的硫含量引入Perkalink 900可以将测试的橡胶网络中的结点结构从混合（10-15％的化学键，其余为簇型和拓扑结）转变为几乎所有的化学键。通过热力学分析评估的最佳固化时间接近于通过压模试验评估的最佳固化时间，在该时间点，两个嵌段中形成的分子结构反映了引入混合物中的两种橡胶的吸附层的平衡状态。分子量分布曲线在两个嵌段中彼此相对的位置取决于橡胶配方。此外，实验证实了如Vilgis和Heinrich计算所预测的那样，交联被聚集的事实。 （C）2000 John Wiley＆Sons，Inc. [参考：32]

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