| 二次电子衬度曲线法研究PVC/MBS共混物断面的分形特征 |
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| 引用本文： | 陈旭东,牛永平,沈家瑞. 二次电子衬度曲线法研究PVC/MBS共混物断面的分形特征[J]. 高分子学报, 2005, 0(5): 669-673 |
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| 作者姓名： | 陈旭东 牛永平 沈家瑞 |
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| 作者单位： | 中山大学高分子研究所,广州,510275;华南理工大学高分子材料科学与工程系,广州,510641 |
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| 基金项目： | 广东省自然科学基金团队项目（基金号20003038） |
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| 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.
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| 关 键 词： | PVC MBS 断面形貌 分形 二次电子衬度曲线 |
| 收稿时间： | 2004-04-27 |
| 修稿时间： | 2004-08-30 |
FRACTAL CHACTERISTICS OF FRACTURE SURFACES OF PVC/MBS BLENDS BY MEANS OF THE SECONDARY ELECTRON LINE METHOD |
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| CHEN Xudong,NIU Yongping,SHEN Jiarui. FRACTAL CHACTERISTICS OF FRACTURE SURFACES OF PVC/MBS BLENDS BY MEANS OF THE SECONDARY ELECTRON LINE METHOD[J]. Acta Polymerica Sinica, 2005, 0(5): 669-673 |
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| Authors: | CHEN Xudong NIU Yongping SHEN Jiarui |
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| 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. |
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| Keywords: | PVC MBS Fractured surface morphology Fractal Secondary electron line |
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