Difference in dilute aqueous solution behavior between poly(ethylene glycol) and poly(ethylene oxide)
Difference in dilute aqueous solution behavior between poly(ethylene glycol) and poly(ethylene oxide)
复制标题
聚乙二醇和聚环氧乙烷在稀水溶液中的行为差异
DOI：
10.1038/s41428-017-0010-x
复制
发表时间：
2018
期刊：
影响因子：
2.8
通讯作者：
Yoshizaki Takenao
中科院分区：
文献类型：
--
作者：
Nakamura Akihisa;Aoki Yutaka;Osa Masashi;Ida Daichi;Yoshizaki Takenao
在25.0 °C下，在甲醇和水中，检测了小重均分子量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，前者聚合物在两端具有羟基，后者在一端具有甲氧基，在另一端具有羟基。结果表明，分子量为3.81 × 103和7.00 × 103的PEO样品在水溶液中形成了较大的聚集体，而PEG和PEO样品在甲醇溶液中均能分离，分子量最大（=1.60 × 104）的PEG和PEO样品在水溶液中也能分离。根据在25.0 ℃下对Mw = 3.81 × 103的PEO样品的水溶液的动态光散射测量的结果，检测到两类具有不同尺寸的散射体，即，孤立链和聚集体，后者的表观流体动力学半径。是前者的20倍。
Static light scattering behavior was examined for poly(ethylene glycol) (PEG) and poly(ethylene oxide) (PEO) of small weight-average molecular weightMw(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 withMw= 3.81 × 103and 7.00 × 103, while all PEG and PEO samples are isolated in methanol solutions, and the PEG samples and the PEO sample of the largestMw(=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 withMw= 3.81 × 103at 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 beingca. twenty times as large as that of the former.