Abstract
Abstract Segmental mobility between 100 and 350 K is reported for a series of mesomorphic side-chain poly(vinyl ether)s with 4–11 methylene carbon atoms in the spacer and phenyl benzoate and stilbenyloxy groups used as mesogens. A glass-rubber transition (α) appears in the vicinity of 300 K. Three subglass processes, referred to as β, 7, and δ obey the Arrhenius and Cole-Cole equations. The δ-process is present only in polymers with flexible and dielectrically active tail groups, e.g., in polymers with an ethoxy group, in which case the process can be assigned to torsion about the pendant phenyl-carbon-ether-oxygen bond. The activation energy (35 ± 5 kJ ·−1) of the β-process is insensitive to the morphology and is assigned to local motions within the spacer. The activation energy of the β-process varied considerably among the studied polymers (60 to 126 kJ·mol−1). The absence of the β-process in the stilbenyloxy polymer suggests that this process is due to reorientation of the carboxylic group in the phen...
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
