Structural, Thermal, Morphological, Adsorption and Catalytic Properties of Poly(BPDAH-co-ODA/PPDA)-Ag/V2O5 Nanocomposites

Thermally stable polyimides (PIs) were prepared by condensation technique at 160 ºC for 5 hours in N-methylpyrrolidone (NMP) medium under N2 atmosphere both in the presence and absence of metal (Ag) and metaloxide (MO) (V2O5) nanoparticles (NPs). The synthesized polymers are characterized by Fourier Transform Infra Red (FT-IR) spectroscopy, 1H Nuclear Magnetic Resonance (1H NMR) spectroscopy, Differential Scanning Calorimetry (DSC), Thermal Gravimetric Analysis (TGA), Scanning Electron Microscopy (SEM), Transmission Electron Microscopy (TEM), Field Emission Scanning Electron Microscopy with Energy Dispersive X-Ray (FE-SEM and EDX). The FT-IR spectrum showed a peak at 1786 cm-1 corresponding to the C=O stretching of dianhydride. The aromatic proton signals appeared between 6.7 and 7.5 ppm in the 1H-NMR spectrum of the resultant PIs. The oxydianiline (ODA) based PI with Ag NP loaded system exhibited the highest Tg value. The apparent rate constant values for the adsorption and catalytic reduction of p-nitrophenol (PNP), Cr6+ and rhodamine 6G (R6G) dye were determined with the help of UV-visible spectrophotometer. Among the catalysts, the system loaded with V2O5 NP has higher kapp values. The experimental results are critically analyzed and compared with the previously available literature values. Copyright © 2020 by Authors, Published by BCREC Group. This is an open access article under the CC BY-SA License (https://creativecommons.org/licenses/by-sa/4.0).

Synthesis, Characterization, Drug Delivery, and Splinting Activity of Folic Acid Bridged Poly(ɛ-caprolactone-co-tetrahydrofuran)

<div><p>Synthesis of a material for drug delivery application is a fascinating field of research. Folic acid (FA) is an anticancer drug and is used as an initiator for the ring opening polymerization of ϵ-caprolactone (CL) at 160°C for 2 h under N₂ atmosphere. The FA end-capped PCL (<b>P1</b>) was used as an effective initiator for the ring opening polymerization of tetrahydrofuran (THF) in the presence of phthalic anhydride (PAH) as a comonomer (<b>P2</b>) at 45°C for 48 h under inert atmospheric condition with mild stirring. The obtained polymers were characterized by FTIR, NMR, DSC, TGA, FESEM, GPC, SEM, UV-visible spectrometry, and EDAX. Appearance of a peak at 1595 cm⁻¹ confirmed the formation of copolymer through tetrahydrofuronium ion. The copolymer structure can be confirmed by noting a peak at 7.6 ppm in the ¹H-NMR spectrum. The increase in weight average molecular weight of <b>P2</b> confirmed the copolymer formation. The previously synthesized polymer was tested toward the splitting application and further confirmed by determining the tensile strength. The drug delivery study was also conducted. <b>P1</b> and <b>P2</b> exhibited the Hixson-Crowell and Higuchi model drug release mechanisms, respectively. The water contact angle measurement also confirmed the conversion of hydrophobic in to hydrophilic during the copolymer formation.</p></div

Synthesis and spectral characterizations of poly(congored) grafted silk fibre — A kinetic approach

172-179Silk fibre has been grafted with poly(congored) (PCR) dye in an aqueous medium under different experimental conditions like temperature, weight of silk fibre and concentration of CR dye in the absence of mordant’s and fixing agents. The grafting kinetics of PCR onto silk fibre is quantitatively followed by spectroscopy (UV-visible and fluorescence spectra) method. The thermodynamic parameters, number of binding sites, binding constant, and nature of quenching system are determined from the kinetic data. The chemical grafting of PCR onto silk fibre is confirmed by FTIR, UV-visible and fluorescence spectra. The conductivity measurements, cyclic voltammetry measurement and FE-SEM analysis also supports the chemical grafting of PCR onto silk fibre