کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1400894 | 984665 | 2008 | 11 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Local modes of molecular mobility in comb-shaped liquid crystalline ionomers containing alkaline metal ions Local modes of molecular mobility in comb-shaped liquid crystalline ionomers containing alkaline metal ions](/preview/png/1400894.png)
Molecular mobility of the comb-shaped copolymer poly(4-[6-(acryloyloxy)hexyloxy]benzoic acid-co-butyl acrylate) and Li- and Rb-containing LC ionomers based on this polymer was studied at low temperatures by the methods of dielectric spectroscopy and thermally stimulated depolarization current. The above copolymers are shown to experience the γ2, γ1, and β-processes, which are related by the reorientation of the end СООН groups, by the mobility of a spacer, and by the reorientation of mesogenic fragments (dimers of oxybenzoic acids) with respect to a long axis, respectively. The formation of multiplet structures in ionomers leads to a suppression of the intensity of the β-process that relates with a partial breakdown of hydrogen-bonded dimmers and with a decrease of their molecular mobility.
Journal: European Polymer Journal - Volume 44, Issue 11, November 2008, Pages 3806–3816