Difference in dilute aqueous solution behavior between poly(ethylene glycol) and poly(ethylene oxide)

作者：Nakamura Akihisa; Aoki Yutaka; Osa Masashi; Ida Daichi; Yoshizaki Takenao

来源：Polymer Journal, 2018, 50(3): 231-237.

DOI：10.1038/s41428-017-0010-x

Static light scattering behavior was examined for poly(ethylene glycol) (PEG) and poly(ethylene oxide) (PEO) of small weight-average molecular weight M-w (3 x 10(3)-2 x 10(4)), in methanol and water at 25.0 degrees 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 M-w = 3.81 x 10(3) and 7.00 x 10(3), while all PEG and PEO samples are isolated in methanol solutions, and the PEG samples and the PEO sample of the largest M-w (=1.60 x 10(4)) 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 M-w = 3.81 x 10(3) at 25.0 degrees 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.

• 出版日期2018-3