Synthesis, characterization, and thermal degradation kinetics of poly(styrene- co - N -maleimide isobutyl polyhedral oligosilsesquioxane)
Makaleler > Tam Makale · 2015
Yazarlar: FEHMİ SALTAN, Hakan AKAT, Fatih Sefa ARIKAN
Journal of Thermoplastic Composite Materials, SCI Expanded İndekslerine Giren Dergi, Uluslararası, Wos, 2015, cilt 30, ss 490-503
Özet
This study demonstrated that poly(styrene- co- N-maleimide isobutyl polyhedral oligosilsesquioxane (POSS)) (P(S- co-NMIP)) was successfully prepared using free radical polymerization. For this purpose, firstly, N-maleimide isobutyl POSS (NMIP) was synthesized using aminopropyllsobutyl POSS (POSS-NH 2 ) and maleic anhydride. Secondly, P(S- co-NMIP) was synthesized using styrene, NMIP, and 2,2-azobis(isobutyronitrile) as initiator in tetrahydrofuran for 24 h at 75°C to give copolymer. The synthesized polymer and compounds were characterized by proton nuclear magnetic resonance, gel permeation chromatography, and Fourier transform infrared spectroscopy. Thermal behaviors of P(S- co-NMIP) were analyzed using thermogravimetric and differential scanning calorimetric analyses. The apparent activation energies ( Es) for thermal degradation of P(S- co-NMIP) were obtained by integral methods (Flynn–Wall–Ozawa (FWO) and Kissinger). P(S- co-NMIP) was heated thermogravimetrically under various heating rates such as 5, 10, 15, and 20°C min −1 at a temperature range of 30–1000°C to determine their thermal degradation mechanisms. The values of E for P(S- co-NMIP) were found to be 127.5 ± 2.3 and 134.4 ± 14.8 kJ mol −1 for FWO and Kissinger methods, respectively. Also, the values of E of synthesized copolymer (P(S- co-NMIP)) were compared with styrene- co-maleic anhydride copolymer in literature.