二次电子衬度曲线法研究PVC/MBS共混物断面的分形特征  

FRACTAL CHACTERISTICS OF FRACTURE SURFACES OF PVC/MBS BLENDS BY MEANS OF THE SECONDARY ELECTRON LINE METHOD

作　　者：陈旭东[1] 牛永平[1] 沈家瑞[2] 

机构地区：[1]中山大学高分子研究所,广州510275 [2]华南理工大学高分子材料科学与工程系,广州510641

出　　处：《高分子学报》2005年第5期669-673,共5页Acta Polymerica Sinica

基　　金：广东省自然科学基金团队项目(基金号20003038)

摘　　要：利用二次电子衬度曲线法测定了聚氯乙烯甲基丙烯酸甲酯丁二烯苯乙烯共聚物(PVCMBS)共混物冲击断面的形貌特征及对应的分形维数值.结果表明,材料的断口或微观结构并不是严格的分形结构,这种自相似性仅存在于一定尺码范围内,不同断面形貌特征所对应的分形维数测量值不同,随着MBS用量增加,PVCMBS共混物缺口冲击强度随满足自相似原理的形貌特征所对应的分形维数值增大而增大.本文从理论上讨论了材料断裂韧性与分形维数的关系.Abstract The fractured surface morphology and the corresponding fractal dimension of poly（vinyl chloride）/methyl methacrylate-butadiene-styrene copolymer （PVC/MBS） blends were investigated by using the secondary electron line method. The results show that the fracture surface or microstructure of materials is not a strict fractal structure, the self-similarity of the fracture surface only exists in a small range of surveying dimension, and the fractal dimension values for fractured surfaces of different features are different from each other. The notch impact strength of PVC/ MBS blends increased with the increase of the MBS amount and the fractal dimension value dominated by the fractured surface with self-similarity. The relationship between the fracture toughness of materials and the fractal dimension value of fractured surfaces was discussed theoretically.

关 键 词：聚氯乙烯 甲基丙烯酸甲酯 丁二烯 苯乙烯共聚物 PVC/MBS共混物 分形特征 二次电子衬度曲线法 断裂韧性 分形维数 

分 类 号：TB301[一般工业技术—材料科学与工程]