AbstractStatic light scattering behavior was examined for poly(ethylene glycol) (PEG) and poly(ethylene oxide) (PEO) of small weight-average molecular weight Mw (3 × 103−2 × 104), in methanol and water at 25.0 °C, the former polymer having hydroxy groups at both ends and the latter having a methoxy group at one end and a hydroxy group at the other. It was found that some aggregates of large size are formed in aqueous solutions of the PEO samples with Mw = 3.81 × 103 and 7.00 × 103, while all PEG and PEO samples are isolated in methanol solutions, and the PEG samples and the PEO sample of the largest Mw (=1.60 × 104) are also isolated even in the aqueous solutions. From the results of dynamic light scattering measurements for the aqueous solution of the PEO sample with Mw = 3.81 × 103 at 25.0 °C, there were detected two classes of scatterers having different sizes, i.e., the isolated chains and aggregates, the apparent hydrodynamic radius of the latter being ca. twenty times as large as that of the former.Static light scattering measurements are carried out for poly(ethylene glycol) and poly(ethylene oxide) (PEO) of the weight-average molecular weight Mw ranging from 3×103 to 2×104 in methanol and water at 25.0 °C. Some aggregates of large size are found to be formed only in the cases of PEO of Mw∼O(103) in aqueous solutions, although for other cases polymer chains are isolated in solutions.

中文翻译：

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聚（乙二醇）和聚（环氧乙烷）之间稀水溶液行为的差异

摘要在 25.0 °C 的甲醇和水中，研究了具有小重均分子量 Mw (3 × 103−2 × 104) 的聚乙二醇 (PEG) 和聚环氧乙烷 (PEO) 的静态光散射行为，前一种聚合物在两端具有羟基，而后者在一端具有甲氧基而在另一端具有羟基。发现在 Mw = 3.81 × 103 和 7.00 × 103 的 PEO 样品的水溶液中形成了一些大尺寸的聚集体，而所有 PEG 和 PEO 样品都在甲醇溶液中分离，PEG 样品和 PEO 样品的即使在水溶液中，最大的 Mw (=1.60 × 104) 也被分离出来。从 Mw = 3.81 × 103 的 PEO 样品水溶液在 25.0 °C 的动态光散射测量结果来看，检测到两类具有不同大小的散射体，即孤立的链和聚集体，后者的表观流体动力学半径约为 是前者的 20 倍。 对重均分子量 Mw 范围为 3×103 至 2×104 的聚（乙二醇）和聚（环氧乙烷）（PEO）进行静态光散射测量甲醇和水，温度为 25.0 °C。发现一些大尺寸的聚集体仅在水溶液中 Mw∼O(103) 的 PEO 的情况下形成，尽管在其他情况下，聚合物链在溶液中是孤立的。在 25.0 °C 的甲醇和水中，对重均分子量 Mw 范围为 3×103 至 2×104 的聚（乙二醇）和聚（环氧乙烷）（PEO）进行静态光散射测量。发现一些大尺寸的聚集体仅在水溶液中 Mw∼O(103) 的 PEO 的情况下形成，尽管在其他情况下，聚合物链在溶液中是孤立的。在 25.0 °C 的甲醇和水中，对重均分子量 Mw 范围为 3×103 至 2×104 的聚（乙二醇）和聚（环氧乙烷）（PEO）进行静态光散射测量。发现一些大尺寸的聚集体仅在水溶液中 Mw∼O(103) 的 PEO 的情况下形成，尽管在其他情况下，聚合物链在溶液中是孤立的。