Conformational mobility in a polymer with mesogenic side groups- dielectric and...

• Autor(es): Mano, J. F. ; Alves, N. M. ; Meseguer Dueñas, J. M. ; Gómez Ribelles, J. L.
• Data: 1999
• Identificador Persistente: http://hdl.handle.net/1822/13401
• Origem: RepositóriUM - Universidade do Minho
• Assunto(s): Differential scanning calorimetry; Dielectric spectroscopy; TSDC; Dielectric spectroscopy; TSDC
• Tipo de Documento: Artigo
• Idioma: Inglês

Descrição

The relaxation times of the conformational rearrangements of the main-chain segments of a liquid crystalline side-chain polymer was determined from differential scanning calorimetry experiments in the temperature interval around and below its glass transition. Phenomenological models with fitting parameters were used to evaluate the temperature dependence of the relaxation times and the form parameter of the relaxation times distribution. These parameters were compared with its counterparts in the dielectric a relaxation process which appear in the temperature interval immediately above the calorimetric glass transition. For the temperature interval below the calorimetric glass transition the differential scanning calorimetry (DSC) results were compared with the dielectric results obtained by the thermally stimulated depolarisation technique.