Spontaneous birefringence in films of some phenyl-containing polymers

Orientational Order in Nanolayers of Cast Polymer Films

“…However, as is seen from Figure , the best fit to the experimental data , is reached with the function S 0 ( A ) calculated according to eq at the same value of the interchain interaction parameter, b = 1.75 for different polysaccharide structures and b = 1.1 for phenyl-containing sulfonated polymers. − …”

“…The double logarithmic dependence of the absolute value of the quadrupole orientational order parameter S 0 on the reduced length A = 4 K 1 /( k B T ) of a Kuhn statistical segment. Experimental data of spontaneous birefringence in polysaccharide films (○) and phenyl-containing sulfonated polymers (∗) and theoretical calculations at b = 1.75 (1) for polysaccharide films , and b = 1.1 (2) for phenyl-containing sulfonated polymers . Dotted parts of dependences 1 and 2 correspond to the range of A values when the model becomes invalid.…”

Orientation order and birefringence in nanolayers of polymer films

“…For the correspondence between monotonically increasing dependences of the order parameter on the reduced Kuhn segment length obtained for polymer films using an inclined polarized beam [3][4][5] (denoted by symbols in Fig. 2) and the dependences calculated via formulas (2) and (4) (solid curves 1-3 and dashed and dotted lines 4-6, respectively), different values of parameters > b c and r/l c in these formulas, charac terizing the interaction between chains or with the substrate surface for the given series of polymer homologs (Table 1, column 6), were found by approx imation.…”

“…3) at pre defined values of the Kuhn segment length, the mean parameter of interchain interactions (Table 1, col umns 2, 3, and 6), the values of slope ΔB/ΔH and the effective film thickness H 0 ( Table 2, columns 2-4), it was assumed for calculations in the approximation (1) that the orientation order parameter for a film of N 3 layers can be presented in the form (6) where N 3 = H/h 0 , and the coefficient с was determined from the relation с = B 0 /(-S 0 ) obtained for thick films [3][4][5]. Figure Experimental results from the BR mea surements in [3][4][5] are denoted by the symbols᭝, ᮀ, ᭺. Comparison of the experimental and calculated dependences enabled us to estimate the thickness of one monolayer d 0 and the number of such layers N 0 = H 0 /d 0 in films of polysachharides and sulfated phenyl containing polymers (Table 2, columns 6 and 7).…”

“…The aim of this work is a theoretical study of order ing effects and birefringence (BR) in polymers in which chains are oriented in certain planes, e.g., in surface layers obtained via the evaporation of solvents from solutions of polysachharides, polytrimethylsilyl propynes, and sulfated phenyl containing polymers [3][4][5].…”