Alternating and random copolymers of carbazole and triphenylamine containing polychalcones are prepared by adopting simple Claisen–Schmidt route via A2 + B2 approach. Terephthaldehyde derivative was used as an additional comonomer along with bisaldehyde of triphenylamine to obtain a random copolymer. The prepared polymers are readily soluble in common organic solvents and the polymers exhibited narrow poly dispersity. The polymers are thermally stable and no observable degradation is observed until 350°C. Further, the spin cast thermally annealed films on glass substrate indicated corrugated surface as measured by scanning electron microscope and atomic force microscopy, which could facilitate for greater interaction at the interfaces. Photophysical properties of the polymers in solution and in thin film showed excellent emission characteristics. Both alternating and random copolymers showed a high quantum yield of 0.74 on comparison with quinine sulfate. Polychalcones with triphenylamine/carbazole showed oxidative response in cyclic voltammetry which suggested the suitability as electrochemical sensors and antioxidant coating material.

Redispersible polystyrene (PS) latexes of particle sizes in the range of 200-220 nm was prepared using low-molecular-weight amphiphilic block copolymer surfactants. Latex powders were obtained by sun drying of the prepared PS latexes and were reintroduced into the solution by simple mechanical agitation/stirring without any additives. DLS and SEM analysis were carried out for pristine/sundried latexes to compare the size and shape of the particles. A series of block copolymers with 2-methyl-2-oxazoline and 2-butyl-2-oxazoline or 2-phenyl-2-oxazoline with repeat units 30/20, 60/20, 15/30, and 15/45 were synthesized through cationic ring opening polymerization (CROP) and were used as nonionic surfactants (NIS) in the preparation of poly(styrene) latexes by emulsion polymerization. In this work, we investigated the role of anchoring ability of butyl/phenyl groups of the block copolymer in providing stability and redispersibility of the latex by comparing with simply cetyl and stearyl surfactants that are devoid of such functionality. The ready redispersibility and retainment of size and shape as that of original latexes confirmed the role of anchoring groups. PS latexes prepared by block-copolymer surfactants that are devoid of anchoring units showed lesser stability and no redispersibility compared to anchored surfactants.

Solution‐processable poly(dibenzalacetone) and poly(dibenzalcyclohexanone) are prepared by the condensation of 1,4‐dialkoxy‐bisbenzaldehyde and acetone/cyclohexanone using classic Claisen–Schmidt condensation. The prepared polymers are readily soluble in common organic solvents due to the presence of alkoxy chains present on the aromatic ring. The availability of α,β‐unsaturated ketone on the backbone is readily functionalized with hydrazine hydrate to obtain poly(pyrazoline acetate), a nonconjugated polymer on the backbone, which shows enhanced emission characteristics on comparison with the pristine polymer and small molecule analogues. The highest occupied molecular orbital–lowest unoccupied molecular orbital (HOMO–LUMO) of levels of poly(pyrazolines) has a band gap of 1.54 eV as calculated from cyclic voltammetry and UV–vis studies. Uniform thin film is obtained by spin casting as 1% solution on chlorobenzene and annealing under vacuum. Atomic force microscopy analysis shows fine morphology of the thin film. I–V characterization of the film shows low turn‐on voltage of 5.3 V. HOMO–LUMO is calculated by density functional theory and the result suggests that these molecules have great potential toward polymer organic light‐emitting diode applications.

Redispersible polystyrene (PS) latexes with particle sizes in the range of 250 nm were prepared using low-molecular-weight amphiphilic thermoresponsive polymeric surfactants. A series of linear polymers with cetyl/stearyl as hydrophobic part and poly(2-methyloxazoline)/poly(2- ethyloxazoline) with about ten repeat units were synthesized through cationic ring opening polymerization (CROP) and were used as nonionic surfactants (NIS) in the preparation of poly(styrene) latexes by batch emulsion polymerization. Latexes prepared with surfactant containing thermoresponsive segments upon being heated yielded a white coagulant above its LCST temperature at 85 oC and redispersed upon cooling with minimal stirring. The particle sizes measured at 25 oC confirmed that the pristine and redispersed latex had almost similar size, whereas at 85 oC an abrupt change in the particle sizes were observed. This promising result shows the excellent use of thermoresponsive surfactant for the preparation of readily redispersible polystyrene latexes.