Effect of nonconjugated polymers on the conjugation length and structure of poly(3‐octylthiophene) in ternary polymer blend

Abstract

The shifting of l max (p-p* transition) of P3OT (poly(3-n-octylthiophene)) was used to monitor the degree of miscibility between P3OT and the matrix polymers. In the ternary blend system, 1% of P3OT is soluble in a uniform PMMA/EVA20 mixed matrix and does not interfere with the miscibility between PMMA and EVA20 (ethylene-vinyl acetate copolymer with 20% of vinyl acetate). But 5% of P3OT can attract EVA20 out of the matrix and induce the separation from 95% of PMMA/EVA20 matrix and cause the doublet peak of l max . Likewise, the DSC thermograms do not demonstrate the melting-point depression of EVA20 in a 5% P3OT ternary system. However, the melting-point depression did occur only for 1% of P3OT. IR-spectra demonstrate that the methylene groups affinity contributed to the misciblity either in 1% P3OT/PMMA or in P3OT (1 and 5%)/EVA20. The solubility difference of P3OT in PMMA (poor) and EVA20 (better) creates a continuous morphology for obtaining a highly conjugated path in a nonconjugated matrix.

Multilayer films composed of conductive poly(3‐hydroxybutyrate)/carbon nanotubes bionanocomposites and a photoresponsive conducting polymer

“…The conjugational length of the polymer can be altered by the interaction with matrix polymers resulting in a shifting of k max (change of the conjugation length), the so-called solvatochromic effect. 27,28 In other words, one can perceive the degree of miscibility of a conjugated polymer with other nonconjugated polymers merely from the shifting of its k max or not. Commonly, the presence of miscibility always contributes to a blue shift of k max because of the interruption on the conjugation (flipping of the thiophene rings out of conjugated plane resulting in the reduction of coplanarity) as observed for the p-p* transition of PCDTBT.…”

“…The location of the λ max depends on the length of the conjugation, longer conjugational length resulting in lower p‐p* energy gap ( E g = hν = hc / λ max ) and higher λ max . The conjugational length of the polymer can be altered by the interaction with matrix polymers resulting in a shifting of λ max (change of the conjugation length), the so‐called solvatochromic effect . In other words, one can perceive the degree of miscibility of a conjugated polymer with other nonconjugated polymers merely from the shifting of its λ max or not.…”

Synthesis and characterization of a novel proton‐exchange membrane for fuel cells operating at high temperatures and low humidities

“…[22][23][24] However, crystallinity can be found if aniline is replaced by ptoluidine, for which only ortho-ortho polymerization is possible. The WAXD patterns of PTF resins of different monomer ratios are shown in Figure 3.…”

Preparation and physical characterization of conjugated polymer-polycarbonate polymer blends

“…There are some research works that investigated the miscibility, electromagnetic interference shielding effectiveness, and the phase diagram of P3OT–polystryrene blend 5,21–24 or P3OT PVC blend. 5,21 However, to the best of our knowledge, no study has been found to investigate the physical properties of P3OT–PC polymer blend.…”