Compound characterisation FTIR spectroscopy

Bedekar and co-workers [4] characterised a series of polyaromatic diamines including polymers of o-chloroaniline, benzidine, 4,4 diaminodiphenyl ether and diaminodiphenyl methane using a variety of techniques including X-ray photoelectron spectroscopy, Fourier transform infrared (FTIR) spectroscopy, and elemental analysis. They found that polymers of diamine compounds had an additional S and O in the form of sulfate ions in the polymer matrix. 

Hexamethylol melamine (HMM) was characterised by FTIR spectroscopy. The optimum dose of HMM in the presence of a sulphur accelerator in a NR-filled compound was determined. The cure rate and kinetics of crosslink formation indicated that HMM enhanced the first-order rate of vulcanisation in an NR compound. The results revealed good mechanical properties of an HMM-based NR carbon black-filled vulcanisate. 15 refs. 

The thermal characterisation of elastomers has recently been reviewed by Sircar [28] from which it appears that DSC followed by TG/DTG are the most popular thermal analysis techniques for elastomer applications. The TG/differential thermal gravimetry (DTG) method remains the method of choice for compositional analysis of uncured and cured elastomer compounds. Sircar s comprehensive review [28] was based on single thermal methods (TG, DSC, differential thermal analysis (DTA), thermomechanical analysis (TMA), DMA) and excluded combined (TG-DSC, TG-DTA) and simultaneous (TG-fourier transform infrared (TG-FTIR), TG-mass spectroscopy (TG-MS)) techniques. In this chapter the emphasis is on those multiple and hyphenated thermogravimetric analysis techniques which have had an impact on the characterisation of elastomers. The review is based mainly on Chemical Abstracts records corresponding to the keywords elastomers, thermogravimetry, differential scanning calorimetry, differential thermal analysis, infrared and mass spectrometry over the period 1979-1999. Table 1.1 contains the references to the various combined techniques. 

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