Preparation and characterization of castor oil‐based polyurethane/poly(o‐methoxyaniline) blend film

Abstract

Blends made up of castor oil-based polyurethane (PU) and poly(o-methoxyaniline) (POMA) were obtained in the form of films by casting and characterized by FTIR, UV-Vis-NIR spectroscopy, and electrical conductivity measurements. Doping was carried out by immersing the films in 1.0M HCl aqueous solution. Chemical bonds between NCO group of PU and NH group of POMA were observed by means of FTIR spectra. The UVVis-NIR spectra indicated that the presence of the PU in the blend does not affect doping and formation of the POMA phase. The electrical conductivity research was in the range of 10 À3 S/cm.

1-3 Castor Oil-Based Polyurethane/PZT Piezoelectric Composite as a Possible Candidate for Structural Health Monitoring

“…As such, their stability for long post-polarization periods can only be estimated 37 . The d 33 variation observed in the sample with 15 vol.% (45 rods) may be attributed to the longer curing time of PUR as reported by Alves et al 44 Over time, the polymer matrix becomes more compact due to the rearrangement and contraction of the polymer chains, which in turn compresses the ceramic rods, improving d 33 after 30 d. This behavior is hardly observable in the sample with 34 vol.% (90 rods), which has the lowest polymeric fraction of the matrix. The results found in this work are within the range of values found in previous studies (Table 2) [45][46][47] .…”

Analysis of the electrical conduction in percolative nanocomposites based on castor‐oil polyurethane with carbon black and activated carbon nanopowder

“…The reaction between diisocyanates and polyols leads to the formation of polyurethanes (PU), which have a urethane linkage . PUs are classified as multiblock copolymers because the polymer chain consists of blocks of hard and soft segments, which permits the control of their flexibility, hardness, and mechanical properties . PUR is extracted from the castor bean seed, a native Brazilian plant.…”