ATR IR spectra and structure of boundary layers of atactic polystyrene

Abstract

The ATR IR spectra of solutions of atactic polystyrene in chloroform at the boundary with KRS 5 glass in the ranges 2800-3100 and 1550-1650 cm -1 are studied. It is shown that the parameters of orientation Σ and polarizability anisotropy of macromolecules estimated from the absorption and refractive indexes and the average complex polarizability of polystyrene boundary layers on KRS 5 vary in an extremum manner with the concentration of polystyrene in a solution. For dilute polystyrene solutions, a high degree of orientation of chains adsorbed on the glass surface is found. The inversion of the sign of polarizability anisot ropy and an increase in orientation parameter Σ of macromolecules in boundary layers on KRS 5 are associated with the compression and interpenetration of coils during the transition from semidilute to con centrated solutions of polystyrene.

Polystyrene bioactive nanofibers using orange oil as an ecofriendly solvent

“…In the FTIR spectrum of PS [Figure (b)], the band at 1585 cm −1 represents the C–C in‐plane stretching modes of benzyl rings. The peak at 1603 cm −1 represents the C–C in‐plane symmetric vibrations of monosubstituted benzyl rings . It can also be seen [Figure (b)] that there is an absorption peak at 1645 cm −1 , attributed to the d ‐limonene (C=C stretching of aromatic groups with the symmetric deformation of the H–C–H angle), indicating the presence of residual orange oil in the nanofibers.…”

Electromigration properties of capillary columns with polystyrene coating as a stationary phase

“…3a-3c). The coatings prepared from dilute PS solutions (с = 0.2 g dL -1 [11]) are characterized by quasiperiodic distribution of polymer particles (Fig. 3b), in contrast to those obtained from more concentrated PS solutions, с = 0.4-0.7 g dL -1 (Fig.…”

“…According to the ATR IR data [11], with an increase in the concentration с in the interval 0.1-0.8 g dL -1 the effective thickness of the near-wall layer in the coatings prepared from solutions of PS in chloroform increases from 0.13 to 0.25 μm. Near с = 0.2 g dL -1 , there is virtually no anisotropy of the optical constants in the near-wall PS layer, and at с > 0.3 g dL -1 the anisotropy increases.…”

“…The revealed effects are associated with the redistribution of intra-and interchain contacts of aromatic rings and of segment-segment interactions in PS fi lms and coatings [11,12]. As the PS concentration is increased, such contacts lead to enhancement of dipole-dipole interactions of aromatic fragments and give rise to polar adsorption sites with рK а 0.8 и 7.3 on the surface of PS fi lms and coatings [7,12] (Fig.…”

Halochromic Polystyrene Nanofibers Obtained by Solution Blow Spinning for Wine pH Sensing

“…This characteristic was indicated by the bands at 754 and 540 cm −1 referring to the bending vibration and C−H out-of-plane bending vibration of aromatic rings, respectively [44][45][46][47]. The band at 1601 cm −1 was associated with the symmetric C=C in-plane vibration of the monosubstituted aromatic ring, and the one at 1583 cm −1 with the C=C in-plane stretching of the benzene ring [45,48,49]. The atactic nature of polystyrene (aPS) refers to its disordered, amorphous structure [47,49].…”