Study of crosslinking acid copolymer/DGEBA systems by FTIR

Abstract

A study of crosslinking of diglycidylether of bisphenol A (DGEBA) by four copolymers of poly(acrylic acid-co-styrene) having different acid group percentages, in the range 7.6 -76.6%, was done by FTIR. The study was done in the isothermal mode for four different temperatures, the reaction being accelerated by triethylamine. We followed each by temperature and the variation of the area of the epoxy infrared band (912-916 cm Ϫ1 ) versus time. The results showed that the mechanism was complex and depended on the acid composition in the copolymer. Three types of reaction were involved: addition esterification, etherification, and condensation esterification.

Optical characteristics and environmental pollutants detection of porous silicon microcavities

“…The reflectance spectra of a PSM chip prior to and after styrene modification display a significant red shift of 29.3 nm for the resonant peak, indicating the successful molecule functionalization with styrene (Figure 9(a)). This is further confirmed by the FTIR spectrum (Figure 9(b)) that exhibits bands characteristic of surface-bound silicon-alkyl ν (Si-C) at 696 and 755 cm −1 [35] and aliphatic ν (C-H) stretching absorptions at 2927 and 2851 cm −1 [35][36][37].…”

“…the vibrational stretching mode of aromatic ν (C-H) at 3084, 3063 and 3026 cm −1 [35][36][37] and aromatic ν (C=C) bands at 1597, 1487 and 1453 cm −1 [35]. In the case of UA-TEPA scheme, gradual shifts of the resonant peak (i.e.…”

Suppression of surface charge accumulation on Al2O3-filled epoxy resin insulator under dc voltage by direct fluorination

“…The characteristic absorption peaks at 1508, 1582, and 1608 cm −1 are assigned to the C=C bonds of the 1-4 substitute benzene and peaks at 831 cm −1 are assigned to the C-H bonds of the 1-4 substitute benzene. 25 The absorption peak at 1460 cm −1 corresponds to the bending vibration of CH 2 and CH 3 , and the peaks at 1363 and 1368 cm −1 are most likely associated with the absorption of doublet in the case of gem-dimethyl groups. 25 The characteristic absorption bands of aromatic and aliphatic ether groups a Measured in high purity nitrogen gas at RH<10% and room temperature.…”

Highly improved reverse osmosis performance of novel PVA/DGEBA cross-linked membranes by incorporation of Pluronic F-127 and MWCNTs for water desalination

“…The strong bands at 3303 cm −1 are ascribed to hydrogen bonded -OH groups present in PVA [80]. The band at 1236 and 1082 cm − 1 are characteristic for C\ \O\ \C cyclic and acyclic groups of epoxy present in DGEBA, respectively [81]. In addition, the band at 838 cm −1 confirmed the characteristic asymmetric vibration of epoxide ring [82].…”