الفهرس | Only 14 pages are availabe for public view |
Abstract The present work involves preparation of poly(N-[3-(5-amino-1,2,4-triazolol]acrylamide) (PATA) homopolymer and copolymer of N-[3-(5-amino-1,2,4-triazolol)]acrylamide ATA with methyl methacrylate (MMA) and methyl acrylate (MA). The thermal stabilities of the homopolymers and copolymers were investigated. Chapter 1 of this four chapters thesis, includes a literature survey on the mechanisms of stabilization and degradation of polymers. Chapter 2 discuss the preparation of monomers, homopolymers and copolymers under investigated. Analytical techniques and thermal methods of analysis were provided The reactivity ratios of copolymerization were determined using 1H-NMR method and found to be r1(ATA) = 0.21 0.1 and r2 (MMA) = 2.0 0.2. Thermogravimetric analysis shows that the stabilities of the copolymer are intermediate between PATA and PMMA homopolymers. In chapter 4, PATA and PMA homopolymers and five different compositions of copolymer of ATA-MA were prepared and characterized by using microanalysis, IR and 1H-NMR spectroscopic techniques. The reactivity ratio of copolymerization were determined using1H-NMR method and found to be r1 (ATA) = 0.58 0.1 and r2 (MA) = 1.52 0.1. Thermogravimetric analysis shows that there is an increase of the thermal stability of PATA homopolymer and ATA copolymers towards PMA homopolymer. The values of the activation energy for the thermal degradation of the copolymers were determined and found to be increasing from 113.3 to 138.5 KJ/mole as the MA concentration of the copolymers increase |