| 外力诱导下的高分子链相变 |
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| 引用本文： | 杨志勇,成军.外力诱导下的高分子链相变[J].浙江大学学报(理学版),2009,36(3):274-277. |
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| 作者姓名： | 杨志勇 成军 |
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| 作者单位： | 1. 温州大学物理系,浙江,温州,325007
2. 金华职业技术学院,浙江,金华,321017 |
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| 基金项目： | 国家自然科学基金，教育部新世纪优秀人才支持计划，浙江省自然科学基金 |
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| 摘 要： | 采用nPERMis(new pruned-enriched rosenbluth method with importance sampling)算法,研究了吸附在表面的高分子链在外力诱导下的相变行为.以链长N=60的高分子链为例,在外力的作用下相变临界温度比没有外力作用的相变临界温度要低,并随外力的增大相变临界温度降低,但比热容峰值会增大.当外力f=1.0或者1.5时,在高温区域高分子链形状发生较大变化,但在低温区由于高分子链内部相互作用和界面的吸附作用,高分子链随温度的降低塌缩成与没有外力作用相同的构象.对于不同的链长,在同一外力的作用下,相变临界温度随链长增大而增大,且比热峰值也增大.
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| 关 键 词： | 外力诱导 nPERMis算法 相变 |
Force-induced phase behavior of polymer chains. |
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| YANG Zhi-yong,CHENG Jun.Force-induced phase behavior of polymer chains.[J].Journal of Zhejiang University(Sciences Edition),2009,36(3):274-277. |
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| Authors: | YANG Zhi-yong CHENG Jun |
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| Institution: | 1.Department of Physics;Wenzhou University;Wenzhou 325007;Zhejiang Province;China;2.Jinhua College of Profession and Technology;Jinhua 321017;China |
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| Abstract: | The phase behavior of a polymer chain with one end grafted on an attractive surface and the other end pulled by a constant external force is studied by using the new pruned-enriched rosenbluth method with importance sampling(nPERMis).In this model the constant force is below the critical value.For a polymer chain of N=60 bonds pulled by a constant force,it is found that the critical temperature of phase transition is lower than that of the case without being pulled,and the peak value of the specific heat in... |
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| Keywords: | force-induced new pruned-enriched rosenbluth method with importance sampling phase transition |
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