Dimensional and hydrodynamic properties of cellulose tris(alkylcarbamate)s in solution: Side chain dependent conformation in tetrahydrofuran
Dimensional and hydrodynamic properties of cellulose tris(alkylcarbamate)s in solution: Side chain dependent conformation in tetrahydrofuran
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溶液中纤维素三（烷基氨基甲酸酯）的尺寸和流体动力学性质：四氢呋喃中的侧链依赖性构象
DOI：
10.1016/j.polymer.2017.02.012
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发表时间：
2017
期刊：
影响因子：
4.6
通讯作者：
K. Terao
中科院分区：
文献类型：
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作者：
Xinyue Jiang;Akiyuki Ryoki;K. Terao
制备了不同相对分子质量的纤维四(氨基甲酸乙酯)(CTEC)、纤维四(氨基甲酸正丁酯)(CTBC)和纤维三(正十八烷基氨基甲酸酯)(CTODC)样品，研究了它们在稀溶液中的构象性质。通过配备多角光散射检测器(SEC-MALS)、小角X射线散射(SAXS)和粘度计的尺寸排除层析测定了25℃下四氢呋喃(THF)中CTEC、CTBC和CTODC样品的重量平均摩尔质量Mw、z-平均回转均方半径、颗粒散射函数P(Q)和特性粘度[η]。红外吸收光谱也观察到了C=O和NH基团之间的分子内氢键。根据蠕虫链模型分析得到的<；s2>；z，P(Q)和[η]数据，以确定库恩链段长度(刚性参数，或持续长度的两倍)λ−1和每个残留物的螺旋螺距(上升)。事实上，由于主链α或β，CTEC、CTBC和CTODC的分子内氢键比相应的直链淀粉衍生物更弱和更少。
We prepared cellulosetris(ethylcarbamate) (CTEC), cellulosetris(n-butylcarbamate) (CTBC), and cellulosetris(n-octadecylcarbamate) (CTODC) samples with different molecular weight to determine their conformational properties in dilute solution. Weight average molar massesMw,z-average mean-square radii of gyration <S2>z, particle scattering functionsP(q), and intrinsic viscosities [η] of the CTEC, CTBC, and CTODC samples in tetrahydrofuran (THF) at 25 °C were determined by size exclusion chromatography equipped with multi-angle light scattering detectors (SEC-MALS), small angle X-ray scattering (SAXS), and viscometry. Infrared (IR) absorption measurements were also made to observe intramolecular hydrogen bonding between C=O and NH groups. The obtained <S2>z,P(q), and [η] data were analyzed in terms of the wormlike chain model to determine the Kuhn segment length (stiffness parameter, or twice of the persistence length)λ−1and the helix pitch (rise) per residueh.While CTBC has the highest chain stiffness in the three cellulose derivatives as in the case of the corresponding amylose derivatives, the difference in the wormlike chain parameters is less significant for the cellulose alkylcarbamate derivatives. Indeed, intramolecular hydrogen bonding of CTEC, CTBC, and CTODC is weaker and fewer than that for the corresponding amylose derivatives owing to the main chain linkage,αorβ.
影响因子：
5.5
作者：
NAKANISHI, Y;NORISUYE, T;KITAMURA, S
通讯作者：
KITAMURA, S
胶原蛋白模型肽在水溶液中的链尺寸和水合行为：[Glycyl-4(R)-Hydroxyprolyl-4(R)-Hydroxyproline]n 和 [Glycyl-Prolyl-4(R)-Hydroxyproline]n
DOI：
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发表时间：
2008
期刊：
Macromolecules 41
影响因子：
--
作者：
K. Terao;K. Mizuno;M. Murashima;Y. Kita;C. Hongo;K. Okuyama;T. Norisue;H.P. Bachinger
通讯作者：
H.P. Bachinger