聚乙烯三相复合材料的正电子湮没研究  

POSITRON ANNIHILATION STUDY OF THE HDPE TERNATY COMPOSITE

作　　者：欧玉春[1] 朱进 王采林[2] 王少阶[2] 

机构地区：[1]中国科学院化学研究所 [2]武汉大学物理系

出　　处：《高分子材料科学与工程》1996年第6期48-51,共4页Polymer Materials Science & Engineering

摘　　要：通过正电子湮没寿命谱的研究，考察了ＨＤＰＥ／ＥＰＤＭ／ＣＢ三相复合材料的结构和性能的关系。结果发现，正正电子素原子（ｏ－Ｐｓ）优先局域和湮没于ＨＤＰＥ和ＥＰＤＭ非晶区的自由体积孔洞之中，因而其寿命τ３保持不变。而由ｏ－Ｐｓ强度Ｉ３反映的自由体积浓度则随填料含量的增加而减小，且改性体系比未改性体系的自由体积浓度低，这是与材料的相结构一致的。自由态正电子寿命τ２则随填料含量变化呈现明显变化，其强度Ｉ２随填料含量增加而增加，并且改性体系比未改性的强度大。The relationship between the structure and property of the HDPE/EPDM/CB ternary composite was investigated through the analysis of positron annihilation lifetime spectroscopy (PALS). The results indicated that the orthopositronium (o Ps) is preferentially localized and annihilated in the free volume holes of HDPE and EPDM amorphous region, therefore its lifetime τ 3 is remained constant. The o Ps annihilation intensity I 3, which reflected the free volume concentration, decreases with the filler content. Moreover, the free volume concentration of the modified composite is lower than that of the unmodified one, which is consistent with the phase structure. The free electron lifetime τ 2 changes significantly with the filler content. Its intensity I 2 increases with the filler content. I 2 of the modified composite is greater than that of the unmodified one. The increase of I 2 value reflectes the interfacial layer difference.

关 键 词：正电子湮没 聚乙烯 炭黑 复合材料 乙丙橡胶 

分 类 号：O632.12[理学—高分子化学]