The mechanism of cure of tetraglycidyl diaminodiphenyl methane with diaminodiphenyl sulfone

Fourier transform infrared (FTIR) spectroscopy is used to determine the cure rate of an epoxy resin consisting of Tetraglycidyl‐4,4′‐diaminodiphenyl methane (TGDDM) and diaminodiphenylsulfone (DDS). Cure rates at 120 and 160°C are shown to increase noticeably when 1% BF3–MEA is added to either TGDDM to TGDDM plus DDS. Fluoroboric acid is shown to increase the cure rates even more than the BF3–MEA. These Results combined with the NMR results in the accompanying article indicate that BF3–MEA is not a catalyst for epoxy resin cure. Instead it is rapidly hydrolyzed to fluoroboric acid which acts as the catalyst.

“…10 The rate of homopolymerization can be determined from the increase in the ether bands. The heteropolymerization can be studied by following the secondary amine absorbance at 3409 cm-l.…”

Section: Polymerization Of Tgddm + Ddsmentioning

confidence: 99%

Epoxy resin cure. II. FTIR analysis

Smith

Larsen

Long

1984

“…Curing kinetics of epoxy resins have been studied with different techniques, such as Fourier transform infrared spectroscopy (FT-IR), [17][18][19] near-IR, 20 and differential scanning calorimetry (DSC). [21][22][23][24][25][26] However, the curing kinetics of epoxy resins during nanocomposite formation have been less studied.…”

Section: Introductionmentioning

confidence: 99%

DSC study of the cure kinetics during nanocomposite formation: Epoxy/poly(oxypropylene) diamine/organically modified montmorillonite system

Ivanković

Brnardić

Ivanković

et al. 2005

ABSTRACT:The effect of an organically modified montmorillonite (OMMT) on the curing kinetics of a thermoset system based on a bisphenol A epoxy resin and a poly(oxypropylene)diamine curing agent were studied by means of differential scanning calorimetry (DSC) in isothermal and dynamic (constant heating rate) conditions. Montmorillonite and prepared composites were characterized by X-ray diffraction analysis (XRD) and simultaneous differential scanning calorimetry-thermogravimetric analysis (DSC-TGA). Analysis of DSC data indicated that the presence of the filler has a very small effect on the kinetics of cure. A kinetic model, arising from an autocatalyzed reaction mechanism, was applied to the DSC data. Fairly good agreement between experimental and modeling data was obtained.

“…FTIR spectroscopy is suitable 1,2 for following the variations occurring in such a material when it is submitted to a curing process [3][4][5][6][7][8][9][10] to completion. The present work deals with crosslinking of the acid copolymer/diglycidylether of bisphenol A (DGEBA) system as followed by FTIR.…”

Section: Introductionmentioning

confidence: 99%

Study of crosslinking acid copolymer/DGEBA systems by FTIR

Cherdoud-Chihani

Mouzali

Abadie³

2003

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.