Phase behaviour of polyethylene knotted ring chains |
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Authors: | Wen Xiao-Hui Zhang Lin-Xi Xia A-Gen Chen Hong-Ping |
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Affiliation: | Department of Physics, Zhejiang University, Hangzhou 310027, China; Department of Physics, Wenzhou University, Wenzhou 325027, China |
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Abstract: | The phase behaviour of polyethylene knotted ring chains is investigated by using molecular dynamics simulations. In this paper, we focus on the collapse of the polyethylene knotted ring chain, and also present the results of linear and ring chains for comparison. At high temperatures, a fully extensive knot structure is observed. The mean-square radius of gyration per bond 2 / (Nb2) and the shape factor <δ*> depend on not only the chain length but also the knot type. With temperature decreasing, chain collapse is observed, and the collapse temperature decreases with the chain length increasing. The actual collapse transition can be determined by the specific heat capacity Cv, and the knotted ring chain undergoes gas-liquid-solid-like transition directly. The phase transition of a knotted ring chain is only one-stage collapse, which is different from the polyethylene linear and ring chains. This investigation can provide some insights into the statistical properties of knotted polymer chains. |
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Keywords: | molecular dynamics method phase transition polyethylene knotted ring chain |
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