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• W2023325074 abstract "An experimental formula of the nucleation rate I of polyethylene as a function of number density of entanglement νe within the melt was obtained as I(νe)∝exp(−γνe), where γ is a constant. In order to obtain a functional form of I(νe), I is determined by changing νe within the melt. The νe within the melt can be changed when crystals with different lamellar thickness l are melted. It is shown that the νe within the melt just after melting is related to l before melting. The νe of folded chain crystals (FCCs) is large, while that of extended chain single crystals (ECSCs) is very small. Therefore, strictly speaking, the experimental formula is a kind of ‘semi-experimental’ one. Because it is obtained by combining an experimental formula of I as a function of l before melting I(l) and a formula between l and νe based on the most probable model. It was found that the νe dependence of I is mainly controlled by the topological diffusion process within the interface between the melt and a nucleus and/or within the nucleus not by the forming process of a critical nucleus. The slope of the plots of log I against ΔT−2 was constant, irrespective of morphologies, FCCs and ECSCs, where ΔT is the degree of supercooling. From this fact, it was concluded that the fold type nucleus are formed from the melt of ECSCs as well as from the melt of FCCs. In our previous study, we found that I decreases exponentially with increase of annealing time Δt at a temperature above the melting temperature. From these results, we proposed a ‘two-stage melt relaxation’, i.e. fast conformational and slow topological relaxations. When the ECSCs are melted, extended chains within ECSCs are rapidly changed to random coiled chain conformation and then chains gradually entangle each other. We also proposed a formula, νe(Δt)∝−ln{const.+Aexp(−Δt/τm)}, where A is a constant and τm is the ‘melt relaxation’ time." @default.
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• W2023325074 date "2002-11-01" @default.
• W2023325074 modified "2023-10-17" @default.
• W2023325074 title "Role of entanglement in nucleation and ‘melt relaxation’ of polyethylene" @default.
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• W2023325074 doi "https://doi.org/10.1016/s0032-3861(02)00592-x" @default.
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