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首页> 外文期刊>Journal of Non-Crystalline Solids: A Journal Devoted to Oxide, Halide, Chalcogenide and Metallic Glasses, Amorphous Semiconductors, Non-Crystalline Films, Glass-Ceramics and Glassy Composites >Molecular dynamics in grafted polydimethylsiloxanes
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Molecular dynamics in grafted polydimethylsiloxanes

机译：接枝聚二甲基硅氧烷的分子动力学

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摘要

Rheological and dielectric behavior of linear PDMS and alkyl-modified PDMS melts has been studied. Molecular dynamics of linear PDMS, being a model of grafted polydimethylsiloxanes studied, has been examined carefully with particular attention paid to its ability to form the semicrystalline phase. Random incorporation of alkyl groups into PDMS chain has been shown to prevent the polymer crystallization. The glass transition temperature of the grafted PDMS changes proportionally to the modifier content. Both techniques allow characterization of the main alpha-relaxation, which is related to the glass transition and exhibits similar behavior in all systems. This relaxation is discussed in terms of the Vogel-Fulcher-Tammann-Hesse (VFTH) approach. The fragility of grafted PDMS materials was found to be higher as compared to the linear polymer. The analysis of the rheological data shows the existence of additional slow relaxation, which has been interpreted as the polymer chain motion.
机译：研究了线性PDMS和烷基改性PDMS熔体的流变和介电行为。线性PDMS的分子动力学是研究的接枝聚二甲基硅氧烷的模型，已经仔细研究，特别注意其形成半结晶相的能力。已经显示烷基无规结合到PDMS链中可防止聚合物结晶。接枝PDMS的玻璃化转变温度与改性剂含量成比例地变化。两种技术都可以表征与玻璃化转变有关的主要α松弛，并且在所有系统中都表现出相似的行为。这种松弛是根据Vogel-Fulcher-Tammann-Hesse（VFTH）方法进行讨论的。发现接枝的PDMS材料的脆性与线性聚合物相比更高。流变数据的分析表明存在额外的缓慢弛豫，这被解释为聚合物链运动。

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