Thermal Properties of Manganese Chloride Salt Reinforced [PVA: PVP] Blend Films

The casting process was used to make pure [PVA: PVP] polymer blend film and MnCl2.4H2O salt augmented polymer blend film at varied weight ratios ((10, 20, 30, 40, 50) wt. percent). The influence of salt weight ratio on the thermal characteristics of [PVA: PVP] polymer blend films augmented with MnCl2.4H2O salt was also investigated. The coefficient of thermal conductivity of the [PVA: PVP] polymer blend films reinforced by MnCl2.4H2O was found to be higher in the experimental results. As the weight ratio of MnCl2. 4H2O grows and then falls, the MnCl2.4H2O salt increases and then reduces erratically. As the concentration of MnCl2.4H2O salt rises, it is discovered that the thermal conductivity coefficient of whole polymer mix films is extremely low. As a result, such films could be utilized as heat-insulation shields. The temperature of glass transition and crystal melting temperature of [PVA: PVP] polymer blend films reinforced by MnCl2.4H2O salt change as the weight ratio of MnCl2.4H2O salt increases.

Electrical and Humidity-Sensing Properties of EuCl2, Eu2O3 and EuCl2/Eu2O3 Blend Films

Impedance-type humidity sensors based on EuCl2, Eu2O3 and EuCl2/Eu2O3 blend films were fabricated. The electrical properties of the pure EuCl2 and Eu2O3 films and EuCl2/Eu2O3 blend film that was blended with different amounts of EuCl2 were investigated as functions of relative humidity. The influences of the EuCl2 to the humidity-sensing properties (sensitivity and linearity) of the EuCl2/Eu2O3 blend film were thus elucidated. The impedance-type humidity sensor that was made of a 7 wt% EuCl2/Eu2O3 blend film exhibited the highest sensitivity, best linearity, a small hysteresis, a fast response time, a small temperature coefficient and long-term stability. The complex impedance plots were used to elucidate the role of ions in the humidity-sensing behavior of the EuCl2/Eu2O3 blend film.

Synthesis and Characterization of Conducting PANDB/χ-Al2O3 Core-Shell Nanocomposites by In Situ Polymerization

Polyaniline doped with dodecylbenzenesulfonic acid/χ-aluminum oxide (PANDB/χ-Al2O3) conducting core-shell nanocomposites was synthesized via an in situ polymerization method in this study. PANDB was synthesized in the presence of dodecylbenzenesulfonic acid (DBSA), which functioned as a dopant and surfactant. The electrical conductivity of the conducting PANDB/χ-Al2O3 core-shell nanocomposite was approximately 1.7 × 10−1 S/cm when the aniline/χ-Al2O3 (AN/χ-Al2O3) weight ratio was 1.5. The transmission electron microscopy (TEM) results indicated that the χ-Al2O3 nanoflakes were thoroughly coated by PANDB to form the core-shell (χ-Al2O3-PANDB) structure. The TEM and field-emission scanning electron microscopy (FE-SEM) images of the conducting PANDB/χ-Al2O3 core-shell nanocomposites also indicated that the thickness of the PANDB layer (shell) could be increased as the weight ratio of AN/χ-Al2O3 was increased. In this study, the optimum weight ratio of AN/χ-Al2O3 was identified as 1.5. The conducting PANDB/χ-Al2O3 core-shell nanocomposite was then blended with water-based polyurethane (WPU) to form a conducting WPU/PANDB/χ-Al2O3 blend film. The resulting blend film has promising antistatic and electrostatic discharge (ESD) properties.