【摘要】 本文用正电子湮没技术(PAT)研究了陶土填充顺丁硫化胶(BR)在热空气中老化后的结构变化,分析了正电子湮没特性与硫化胶的交联密度、有序性、空穴大小及其分布。链段活动性等微观结构的关系,探讨了材料的玻璃化转变和大分子网构的变化,证明了正电子在顺丁硫化胶中的湮没特性与其表层的自由体积、有序性、T_g转变等有很好的相关性。更多还原

【Abstract】 In this paper, by means of Positron Annihilation Technique (PAT) , the authors have studied the structure changes of Cis-1, 4-polybutadiene and natural rubber vulcanizates with clay .as filler (BRand NR) on aging in hot air; analyzed the relation between the positron annihilating characteristics, the microstructures .of the vulcanizates,the cross-linking density, the degree of order, the size and distribution density of the voids, the activity of chain segments, and so on; discussed the changes in the glass transition and the network structure of the materials: and thus proved that there is a good interrelation between the positron annihilating characteristics in vulcanizates, the free volume, the degree of order and the Tg transition of their surface layer.更多还原