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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 >Investigation of local chain dynamics in poly(di-n-alkylitaconate)s
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Investigation of local chain dynamics in poly(di-n-alkylitaconate)s

机译：聚（二正烷基衣康酸酯）中的局部链动力学研究

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摘要

C-13 NMR in solution and molecular dynamics simulations were used to discuss the respective roles of intramolecular constraints and intermolecular contributions in poly(di-n-alkylitaconate)s (PDAI) with various side chain lengths. These polymers exhibit the unusual phenomenon of two distinct glass transitions when the alkyl side chains contain at least six carbon atoms. Nuclear Overhauser enhancement and spin-lattice relaxation time measurements in solution for PDAI's with different side-chain lengths clearly indicated the existence of a competition between internal plasticization and organization of the alkyl parts of the side chains. This organisation decreases the flexibility of the long side chains and slows down the internal mobility of the main chain and carbonyl groups. Molecular modelling of the relative oreanization of two polymer chains demonstrates the strong tendency of the long alkyl parts to order and form discrete regions, which can be relited to the existence of the second low-temperature glass transition in PDAI's with long side groups. (c) 2006 Elsevier B.V. All rights reserved.
机译：在溶液和分子动力学模拟中使用C-13 NMR来讨论分子内约束和分子间贡献在具有不同侧链长度的聚（二正烷基衣康酸酯）（PDAI）中的各自作用。当烷基侧链包含至少六个碳原子时，这些聚合物表现出两个不同的玻璃化转变的异常现象。对于具有不同侧链长度的PDAI，溶液中的核Overhauser增强和自旋晶格弛豫时间测量清楚地表明，内部增塑与侧链烷基部分的组织之间存在竞争。这种结构降低了长侧链的柔韧性，减慢了主链和羰基的内部迁移率。两条聚合物链的相对Oreanization的分子模型表明，长烷基部分有序排列并形成不连续区域的强烈趋势，可以重新证明存在于带有长侧基的PDAI中第二个低温玻璃化转变的存在。 （c）2006 Elsevier B.V.保留所有权利。

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