Pn. Lavrenko et al., Flow birefringence and optical anisotropy of copolymers of para- and meta-phenylene-1,3,4-oxadiazoles, VYSO SOED, 42(2), 2000, pp. 340-346
Citations number
18
Categorie Soggetti
Organic Chemistry/Polymer Science
Journal title
VYSOKOMOLEKULYARNYE SOEDINENIYA SERIYA A & SERIYA B
For a series of copolymers of aromatic para- and meta-1,3,4-oxadiazoles wit
h a variable content of the components, the flow birefringence (the Maxwell
effect) and orientation of macromolecules in sulfuric acid solutions were
studied. Based on hydrodynamic data, the molecular masses of the copolymers
and the related homopolymers lie in the range (25-33) x 10(3), which corre
sponds to the number of segments in a molecular chain ranging from 19 to 21
. Comparison of the dynamooptical data obtained for the copolymers and homo
polymers indicates that the dependence of flow birefringence on the molar c
omposition of the copolymer follows the additivity law of the chain flexibi
lity mechanisms.