Pyridine polymers thermal properties

The thermal properties of polyesters are of the greatest importance for their end applications. The important features of a polymer, such as bond strength, inter-and intra-molecular forces, resonance stability, crystallinity, structural imperfections and molecular weight, are responsible for their thermal behaviour. Long oil polyester resin and styrenated polyester resin are made flame retardant by the incorporation of bis-pyridine, bis-tribromophenoxo copper complex and polydibromophenylene oxide. 

Poly(isopropyl vinyl ether-alt-MA), 316, 621 Poly(isopropyl-o-vinyl formal-alt-MA), 328 Poly(itaconic anhydride), 240 Poly(lauryl methacrylate-co-MA), 284 Poly(maleic acid) applications, 239, 261 ionization properties, 260 physical properties, 259 polyelectrolyte behavior, 260 solution properties, 259 synthesis by pyridine polymer, 259 thermal properties, 260 titration behavior, 260 Poly (maleic anhydride), 232, 239-262 analysis methods, 241, 245, 248, 249, 254,... 

Abstract This chapter introduces the moisture-induced shape memory effect (SME) observed in supramolecular shape memory polymers, particularly shape memory polyurethane (SMPU), containing pyridine moieties. The moisture absorption of polyurethane networks containing pyridine moeties (PUPy) is discussed followed by an investigation into the effect of relative humidity (RH), temperature, BINA content and MDI-BDO content. The induence of moisture absorption on both the thermal properties and the dynamic mechanical properties of SMPUs is also described, along with the moisture-induced SME mechanism. 

Thermally stable copolymers of 3-(trimethylsiloxyl)- and 3,5-bis(trimethylsiloxyl)benzoyl chloride (4A) or 3-acetoxy- and 3,5-diace-toxy-benzoic acid (4B) were prepared with mole ratios of AB AB2 monomer ranging from 160-5.32 Polymers containing 10-20 mole % of branching monomers were insoluble in CHC13 but soluble in polar solvents, such as A,A-dimethylformamide (DMF) or a mixture of pyridine and benzene. Compared to the linear homopolymer of 3-hydroxy-benzoic acid, the branched polymer showed lower crystallinity and slower crystallization. There was an inverse linear relationship between percent crystallinity and the number of branches in the chain. Similarly, in an attempt to improve moldability and decrease anisotropy of rigid aromatic polyesters, 0.3-10 mole % of 1,3,5-trihydroxybenzene, 3,5-di-hydroxybenzoic acid, and 5-hydroxyisophthalic acid were copolymerized with p-hydroxybenzoic acid/terephthalic acid/4,4 -dihydroxy-diphenyl.33 The branched polymer showed a lower orientation and possessed improved flex properties. 

The merocyanine form of the spirooxazine (59) is produced after flash irradiation of the dye in a polymer film and the thermal decay of the open form has been studied in detail. The influence of solvent on the photochromic properties of a series of spirooxazines related to (59) has been reported. The photochromism of 2-(2,4-dinitrobenyl)pyridine has been studied in polymer films. ... 

Mehdipour-Ataei S, Taremi F. Preparahon and properties of novel thermally stable pyridine-based poly(amide imide mide)s. J Appl Polym Sci 2011 121(l) 299-308. 

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