Determination of the Chain Stiffness Parameter of Molecular Rod Brushes Consisting of a Polymethacrylate Main Chain and Poly(n-hexyl isocyanate) Side Chains
Determination of the Chain Stiffness Parameter of Molecular Rod Brushes Consisting of a Polymethacrylate Main Chain and Poly(n-hexyl isocyanate) Side Chains
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DOI：
10.1021/acs.macromol.5b02195
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发表时间：
2015-12
期刊：
影响因子：
5.5
通讯作者：
Y. Saito;M. Kikuchi;Y. Jinbo;A. Narumi;S. Kawaguchi
中科院分区：
文献类型：
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作者：
Y. Saito;M. Kikuchi;Y. Jinbo;A. Narumi;S. Kawaguchi
用静态光和小角x射线散射法测定了由柔性聚甲基丙烯酸酯（PMA）主链和聚正己基异氰酸酯（PHIC）棒状侧链组成的圆柱棒状刷在25℃四氢呋喃（THF）中主链刚度参数λM-1。此外，我们还理顺了λM-1作为HIC、Ns聚合度的函数。将λM-1值与由柔性聚苯乙烯（PSt）主链组成的棒状刷的值进行比较[Macromolecules 2008,41, 6564]，以揭示棒状刷的分子构象如何受到主链初级结构或化学性质差异的影响。以α-甲基丙烯氧氧乙氧基-ω-乙酰基端异丙基大单体（MA-HIC-Ns-Ac）为原料，在60℃正己烷中自由基均聚，制备了一系列侧链长度为26 ~ 82的聚（MA-HIC-Ns-Ac）棒状刷。poly（MA-HIC-Ns-Ac）的均方横截面半径（⟨Sc2⟩）是…
The main chain stiffness parameter (λM–1) of cylindrical rod brushes consisting of a flexible polymethacrylate (PMA) main chain and poly(n-hexyl isocyanate) (PHIC) rod side chains has been determined in tetrahydrofuran (THF) at 25 °C by static light and small-angle X-ray scattering measurements. Furthermore, we have rationalized λM–1 as a function of the degree of polymerization of HIC, Ns. The λM–1 values were compared to those of rod brushes consisting of a flexible polystyrene (PSt) main chain [Macromolecules 2008, 41, 6564] to reveal how the molecular conformation of the rod brush is influenced by the difference in the primary structure or chemical nature of the main chain. A series of rod brushes, poly(MA-HIC-Ns-Ac) with different side chain lengths, where Ns ranged from 26 to 82, were prepared by radical homopolymerization of α-methacryloyloxyethoxy-ω-acetyl ended PHIC macromonomers (MA-HIC-Ns-Ac) in n-hexane at 60 °C. The mean-square cross-section radius of gyration (⟨Sc2⟩) of poly(MA-HIC-Ns-Ac) wa...