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高分子科学中的平均场理论和1/N展开

DOI: 10.3724/SP.J.1105.2013.12177, PP. 160-165

Keywords: 平均场理论,1/N,展开,对称性,高分子物理

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Abstract:

利用1/N展开理论考察高分子物理中的几个典型高分子体系.研究发现,平均场理论只有在体系具备一定对称性时才适用.在中性高分子溶液中,不论是单组分、多组分还是嵌段共聚物体系,1/N展开理论对于N取值不小于6时是适用的.对于聚电解质体系,平均场理论仍然可以粗糙地描述弱带电聚电解质的统计性质.对于强带电聚电解质体系,由于体系对称性大为降低,平均场理论不再适用,标度理论或许会是一个适合的方法.

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