M. A. Diab

Conducting polymers. V. Electrical conductivity of polymer complexes of bis-2,6-diaminopyridinesulphoxide-copper halides

The electrical conductivity of polymer complexes of bis-2,6-diaminopyridinesulphoxide with CuCl2, CuBr2 and CuI2 was measured at different frequencies and temperatures. It was found that the conductivity increases as frequency and/or temperature increases. The dielectric constant, dielectric loss and relaxation time of the polymer complexes were calculated.

Polymer complexes—X. Polymerization of methyl methacrylate in the presence of some transition metal chlorides☆

Polymer complexes of methyl methacrylate with some transition metal chlorides were prepared and characterized by elemental analysis, i.r. and electronic spectroscopy. The rates of polymerization of methyl methacrylate in the absence and in the presence of metal chlorides were studied. The activation energies of the polymerizations were calculated.

Thermal degradation of poly(acryloyl chloride) and copolymers of acryloyl chloride with methyl methacrylate

Abstract The products of thermal degradation of poly(acryloyl chloride) (PAC) homopolymer and copolymers of acryloyl chloride with methyl methacrylate (AC-MMA) have been analysed quantitatively using thermal analysis, i.r. spectroscopy and gas-liquid chromatography. The major products of degradation of PAC are HCl, CO and chain fragments. Methyl chloride, MMA monomer, CO and chain fragments are the principal products of degradation of AC-MMA copolymers. Possible mechanisms for the formation of these products are described and discussed.

Thermal stability of poly(β-bromostyrene) and copolymers of β-bromostyrene with methyl methacrylate

The thermal stabilities of poly(β-bromostyrene), poly-(methyl methacrylate) homopolymers and copolymers ofβ-bromostyrene-methyl methacrylate covering the entire composition range were studied using TG analysis. At each extreme of the composition range, incorporation of comonomer units results in a copolymer more stable than the brominated homopolymer. Maximum stability occurs for compositions of approximately 62 mole percentβ-bromostyrene. The formation of the anhydride structure among the degradation products leads to the stability of the copolymers.ZusammenfassungDie thermische Stabilität vonβ-Bromstyrol- und Methylmethacrylat-Homopolymeren sowie von sich über den ganzen Zusammensetzungsbereich erstreckendenβ-Bromstyrol/Methylmethacrylat-Kopolymeren wurde thermogravimetrisch untersucht. An beiden Enden des Zusammensetzungsbereichs führt der Einbau von Komonomereinheiten zu einem Kopolymer, das stabiler als das bromierte Homopolymer ist. Maximale Stabilität wird bei einem Gehalt von etwa 62 Mol-%β-Bromstyrol erreicht. Die Bildung der Anhydridstruktur führt zur Stabilität des Kopolymers.РезюмеМетодом ТГ изучена те рмоустойчивость поли/β-бромстирола, п олиметилакрилата и сополимеровβ-бромст ирола и метилметакри лата во всей области их соста ва. Соединение комономерных звенье в в сополимере для каж дой экстремальной облас ти состава, приводит к его большей термоустойч ивости по сравнению с бронированным гомоп олимером. Максимальн ая гермоустойчивость д остигается для соста вов с содержаниемβ-бромст ирола приблизительн о равным 62%. Образование с реди продуктов разло жения ангидридной структу ры способствует устойчивости сополи мера.