Synthesis, Characterization and Thermal Degradation Kinetics of Poly(methylmethacrylate-co-methacrylic acid)

Abstract

In this study, poly (methyl methacrylate-co-methacrylic acid) (poly(MM-co-MA)) was synthesized at      70 ^OC in the presence of benzoyl peroxide, methacrylic acid and methyl methacrylate monomers by free radical addition polymerization method. The obtained structure of poly (methyl methacrylate-co-methacrylic acid) was characterized by GPC(Gel permeation chromatography), FT-IR(Fourier transform infrared spectroscopy) and ¹H-NMR(Nuclear magnetic resonance) analyses. (M_n=39800 g/mol PDI: 2.04) Radical polymerization yield was obtained at 42%. The thermal decomposition kinetics of poly (methyl methacrylate-co-methacrylic acid) was also investigated by the thermogravimetric process. The thermal degradation of the poly(MM-co-MA) was observed in two steps. Kinetic parameters were computed by the Flynn-Wall-Ozawa process and the Kissinger process. The first step and second step activation energy was determined to be 108,34 kJ / mol, 253,41 kJ / mol according to the Flynn-Wall-Ozawa process. According to the Kissinger-Akahira-Sunose process, the activation energy of the first step was 114,40 kJ/mol and activation energy of the second step was 231,13 kJ/mol.

Keywords

• Thermal degradation,polymer synthesis,radical polymerization,poly(methyl methacrylate-co-methacrylic acid)

Poli (metilmetakrilat-ko-metakrilik asit) Sentezi, Karakterizasyonu ve Termal Bozunma Kinetiği

Abstract

Bu çalışmada, poli (metil metakrilat-ko-metakrilik asit) (poli (MM-ko-MA))) 70 ° C'de benzoil peroksit , metakrilik asit ve metil metakrilat monomerleri varlığında serbest radikal  polimerizasyon yöntemiyle sentezlenmiştir. Poli (metil metakrilat-ko-metakrilik asit)  yapısı, GPC, FT-IR ve 1H-NMR metotları analizleri ile karakterize edildi. Mn = 39800 g / mol PDI: 2.04 Radikal polimerizasyon verimi% 42 olarak elde edildi. Poli (metil metakrilat-ko-metakrilik asit) 'in termal bozunma kinetiği ayrıca araştırılmıştır. Poli (MM-ko-MA) 'nın ısıl bozulması iki aşamada gözlenmiştir. Kinetik parametreler Flynn-Wall-Ozawa işlemi ve Kissinger metodu ile hesaplandı. Birinci adım ve ikinci adımın aktivasyon enerjisinin Flynn-Wall-Ozawa  metoduna göre 108,34 kJ / mol, 253,41 kJ / mol olduğu belirlenmiştir. Kissinger-Akahira-Sunose metoduna göre, ilk adımın aktivasyon enerjisi 114,40 kJ / mol ve ikinci adımın aktivasyon enerjisi 231,13 kJ / mol bulunmuştur.

Keywords

• Termal bozunma,polimer sentezi,radikal polimerizasyon,Poli (metilmetakrilat-ko-metakrilik asit)

References

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