The effect of even-odd methylene spacer groups on the thermal stability of epoxy-amine polymers
Description
A series of some novel epoxy-amine polymers was successfully synthesized by using DGEBA and aromatic diamines as starting materials. The cured free standing flexible polymer films were characterized by FTIR, DSC, TGA, and WAXD. The values of Tg decreased as the length of the central methylene spacers increased. This decrease in Tg values occurred in a zig-zag fashion affirming an even-odd effect. Epoxy-amine polymers containing even number of methylene spacers showed remarkably higher Tg values as compared to the polymers containing an odd number of methylene spacers. TGA analysis revealed that epoxy-amine polymers exhibited thermal stability upto 340 degree C. The length of central methylene spacers showed no significant detrimental effect on the degradation temperatures of the polymers. XRD data of epoxy-amine polymers showed their amorphous nature. (author)
Additional details
Publishing Information
- Journal Title
- Journal of the Chemical Society of Pakistan
- Journal Volume
- 37
- Journal Issue
- 1
- Journal Page Range
- p. 92-98
- ISSN
- 0253-5106
INIS
- Country of Publication
- Pakistan
- Country of Input or Organization
- Pakistan
- INIS RN
- 46129516
- Subject category
- S37: INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY;
- Descriptors DEI
- AMINES; CRYSTALLIZATION; HYDRAZINE; METHYLENE RADICALS; POLYMERS; SURFACE COATING; X-RAY DIFFRACTION
- Descriptors DEC
- COHERENT SCATTERING; DEPOSITION; DIFFRACTION; NITROGEN COMPOUNDS; ORGANIC COMPOUNDS; PHASE TRANSFORMATIONS; RADICALS; SCATTERING