A series of new polyamides and copolyamides containing aromatic sulfone ether linkages was synthesized from 4,4′‐[sulfonyl‐bis(4,1‐phenyleneoxy‐3‐pentadecyl)]bisphenylamine (SPPBA) and isophthaloyl chloride (IPC), terephthaloyl chloride (TPC), bis(4‐chlorocarbonylphenyl)dimethylsilane (DMSC) and bis(4‐chlorocarbonylphenyl)diphenylsilane (DPSC) by a low‐temperature inter‐facial polymerization technique. SPPBA was prepared from 4,4′‐dichlorodiphenyl sulfone and 4‐amino‐3‐pentadecyl phenol derived from cashew‐nut shell liquid and was characterized by spectral methods and elemental analysis, whereas the polyamides were characterized by solution viscosity, IR spectroscopy, thermogravimetric analysis, X‐ray diffraction and solubility. These polyamides showed enhanced solubility in organic solvents and no weight loss below 405°C in nitrogen. The effect of pendant penladecyl substituents and silicon in the main chain of polyamides on the properties of these polymers was studied by comparing their properties with those of unsubstituted polyamides prepared from 4,4′‐[sulfonylbis(4,1 ‐phenyleneoxy)] bisphenylamine.
SYNOPSISNew polyamides and copolyamides containing silicon and sulfone ether linkages, soluble in common aprotic solvents and having inherent viscosities of 0.3-0.6 dL/g have been synthesized by solution condensation of bis-(4-chlorocarbonyl phenyl) dimethylsilane (DMSC) and/or bis-(4-chlorocarbonyl phenyl )diphenylsilane (DPSC) with 4,4'-[ sulfonylbis-(4,l-phenyleneoxy) ] bisbenzenamine, 3,3'-[ sulfonylbis( 4,l -phenyleneoxy) ] bisbenzenamine, and bis ( 4-aminophenyl) ether. These polymers were characterized by infrared spectra, solution viscosity, thermooxidative degradation, differential scanning calorimetry, and x-ray diffraction. These polymers show good thermal stability.* NCL Communication No. 4778.
CdS-CuS heterojunction films have been grown successfully on a copper substrate using a chemical bath deposition (CBD) method. The obtained films are characterized using X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), optical absorption, Raman spectroscopy and photoluminescence (PL) analysis and the photo-electrochemical (PEC) properties of the CdS-CuS heterojunction have been studied using different electrolytes. The XRD pattern of CuS-CdS shows peaks corresponding to CuS (hexagonal) and CdS (cubic) structures, while the optical absorption studies revealed the presence of an absorption edge corresponding to CuS-CdS (band gap of 1.85 eV). The Raman spectra of the CuS, CdS and CuS-CdS heterojunctions were recorded and are in good agreement with the results reported in the literature. TEM and cross-sectional SEM images show an overlap between CuS rods and CdS flasks. The charge transfer across the layers was studied by using PL spectra. The measurement of the photo-electrochemical properties using a conventional two electrode system for an iodine electrolyte showed the highest conversion efficiency of 1.40% as against for potassium ferro-ferricyanide (0.38%) and polysulphide electrolytes (0.02%).
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