Additional Entanglement Effect Imposed by Small Sized Ring Aggregates in Supramolecular Polymer Melts: Molecular Dynamics Simulation Study
Additional Entanglement Effect Imposed by Small Sized Ring Aggregates in Supramolecular Polymer Melts: Molecular Dynamics Simulation Study
复制标题
超分子聚合物熔体中小尺寸环状聚集体产生的附加缠结效应:分子动力学模拟研究
DOI:
10.1021/acs.macromol.9b02209
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发表时间:
2020
期刊:
影响因子:
5.5
通讯作者:
W. Paul
中科院分区:
文献类型:
--
作者:
E. Lee;W. Paul
This work investigates structures and dynamics of supramolecular polymer (SMP) melts comprising poly(ethylene glycol)s end-functionalized by pairwise associating stickers via molecular dynamics simulations. The system involves ring and linear aggregates, and an exponentially increasing segmental relaxation time indicates a topological effect besides entanglements between linear aggregates. We find the additional entanglements of the linear aggregates when more than two linear aggregates thread one ring. Moreover, even if one linear aggregate threads a ring because the monomeric motion in the linear aggregate is suppressed, the effective tube diameter decreases. The exponentially increasing segmental relaxation time originating from the ring–linear threading is more quantitatively explained by the H-bond lifetime for ring aggregates. This work provides the first direct evidence of the ring topology affecting the dynamics of SMPs, which would further broaden the possibility of tailoring novel SMP properties taking into account the ring-topological effect.
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