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Exploring the Molecular Origin for the Long-Range Propagation of the Substrate Effect in Unentangled Poly(methyl methacrylate) Films
oleh: Jianquan Xu, Xiaojin Guo, Hongkai Guo, Yizhi Zhang, Xinping Wang
Format: | Article |
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Diterbitkan: | MDPI AG 2023-12-01 |
Deskripsi
The polymer/substrate interface plays a significant role in the dynamics of nanoconfined polymers because of its suppression on polymer mobility and its long-range propagation feature, while the molecular origin of the long-range substrate effect in unentangled polymer material is still ambiguous. Herein, we investigated the propagation distances of the substrate effect (<i>h</i>*) by a fluorinated tracer-labeled method of two unentangled polymer films supported on silicon substrates: linear and ring poly(methyl methacrylate) films with relatively low molecular weights. The results indicate that the value of <i>h</i>* has a molecular weight dependence of <i>h</i>*∝<i>N</i> (<i>N</i> is the degree of polymerization) in the unentangled polymer films, while <i>h</i>*∝<i>N</i><sup>1/2</sup> was presented as previously reported in the entangled films. A theoretical model, depending on the polymer/polymer intermolecular interaction, was proposed to describe the above long-range propagation behavior of the substrate effect and agrees with our experiment results very well. From the model, it revealed that the intermolecular friction determines the long-range propagation of the substrate effect in the unentangled system, but the intermolecular entanglement is the dominant role in entangled system. These results give us a deeper understanding of the long-range substrate effect.