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首页> 外文期刊>Journal of Applied Polymer Science >Unperturbed Dimensions and the Theta Temperature of Dextran in Aqueous Solutions
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Unperturbed Dimensions and the Theta Temperature of Dextran in Aqueous Solutions

机译：水溶液中右旋糖酐的无扰动尺寸和Theta温度

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Intrinsic viscosity measurements were carried out on dextran samples (of different molecular weights) in aqueous soltions at 25,28,31,34,37,40, and 43deg C. The extrapolation methods were used for the data; they gave unperturbed dimensions, K_0, of the chain. The unperturbed root-mean-square end-to-end distance _0~1/2 calculated for the polymer sampels in water indicte that the polymer coils are slightly contracted in this solvent as the temeprature is increased. The long-range interaction parameter, B, was also determined. In aqueous dextran solutions, this showed a significatn decrease in the long-range interactions between 25 and 43deg C. The values of Θ = 317.82 and 316.57 K were obtained from the temperature dependence of the interaction parameter B in the Kurata-Stockmayer-Fixman and Berry equations. Calculated values were interpreted mainly on the basis of hydrogne-bond formation between polymer segments and dextran-water molecules in solution.
机译：在25℃，28℃，31℃，34℃，37℃，40℃和43℃下在水性溶液中对（不同分子量的）右旋糖酐样品进行特性粘度测量。他们给出了链的稳定尺寸K_0。对于水中的聚合物样品计算的无扰动的均方根端到端距离 _0〜1/2表示随着温度的升高，聚合物线圈在该溶剂中略微收缩。还确定了远程相互作用参数B。在右旋糖酐水溶液中，这表明在25和43°C之间的远距离相互作用显着降低。θ= 317.82和316.57 K值是从Kurata-Stockmayer-Fixman和浆果方程式。计算值的解释主要基于聚合物链段与溶液中右旋糖酐-水分子之间的水合键形成。

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