Thermal and IR studies on copper doped polyvinyl alcohol

Abstract

5 mol% PVA : x mol% Cu 2+ polymer films were prepared by casting process. Thermal transitions and thermal degradation of samples with respect to copper concentration were studied by differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA), respectively. Increase in glass transition temperature as a function of copper concentration shows a strong branching and steric effects in copper doped PVA complexes. Thermal degradation of films to an extent of 4-5% was found with an increase in copper content. FTIR spectrum of PVA doped Cu 2+ ions indicate the presence of O-H, C-H, C=C and C-O groups.

Characterisation of poly(vinyl alcohol) coating mixed with anthocyanin dye extracted from roselle flower with different nitrate salt

“…Our results obtained for pure PVA were similar to that obtained by Raju et al (2007). Weight loss at temperature below 1008C was due to water content.…”

CNF-reinforced polymer aerogels: Influence of the synthesis variables and economic evaluation

“…Sample GEL PVA(0.25% CNF) showed a first weight loss of 18% in the temperature range of 180-250°C, which could be associated to the evaporation of water and/or splitting of monomers. In a second step (300-404°C), dehydration and chain scissions reactions of PVA took place, thus leading to the simultaneous release of water and residual acetate groups (since they are randomly inserted between hydroxyl groups) [68]. Atomic mass units (a.m.u) of 15,18,43,44,60,78 and 91 -corresponding to fragment ions CH 4 , H 2 O, CH 3 CO, CO 2 , C 2 H 4 O 2 , C 6 H 6 , and C 7 H 8 , respectively, according to the database of National Institute of Standards and Technology (NIST) -were obtained in the MS spectra.…”

A Facile One-Pot Synthesis of MSe (M = Cd or Zn) Nanoparticles Using Biopolymer as Passivating Agent

“…The strong bands observed at 3229-3365 cm -1 corresponding to the O-H stretching frequency indicates the presence of hydroxyl groups (Sweeting, 1968). The broad weak band observed at 2159 cm -1 has been assigned to the combination frequency of C-H with C-C (Raju et al, 2007). The bands observed at 1634 cm -1 and 1411 cm -1 have been assigned to the C=C stretching mode and bending modes of CH 2 group respectively.…”