Liquid-crystalline main-chain polymers with a poly(p-phenylene terephthalate) backbone. 5. Dynamic mechanical behaviour of the polyester with dodecyloxy side chains
article
Tapes of the thermotropic, comb-like, polymer poly(p-phenylene-2,5-didodecyloxyterephthalate) were investigated by dynamic mechanical thermal analysis in tension. This polymer, in which the main chains form layers, exhibits three different low-temperature structures, characterized by the amount of side-chain ordering. The influence of the structure as well as the degree of orientation on the dynamic modulus of films was measured. The results show that the temperature-dependent modulus of oriented films is largely determined by the successive side-chain relaxations and disorderings. The main differences in modulus between the structures arise because of the β relaxation around -35°C; they level off at higher temperatures on passing the respective side-chain disordering transitions.
TNO Identifier
232593
ISSN
00323861
Source
Polymer, 35(11), pp. 2359-2363.
Pages
2359-2363
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