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“How do chain molecules spontaneously entangle from completely disentangled polymer melt?” remains the most interesting unsolved problem. In order to solve this problem, we used the concept that the melt of “nascent” polymer crystallized during polymerization just after melting does not include any entanglements. We succeeded in detecting the increase of entanglement density ν e with the increase...
An experimental formula of the nucleation rate I of polyethylene as a function of number density of entanglement ν e within the melt was obtained as I(ν e ) exp(-γν e ), where γ is a constant. In order to obtain a functional form of I(ν e ), I is determined by changing ν e within the melt. The ν e within the melt can be changed when crystals with different...
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