Copolymerization of methyl methacrylate with 2-methylbenzyl methacrylate and 4-methylbenzyl methacrylate: Synthesis, characterization, and monomer reactivity ratios
Journal of Macromolecular Science - Pure and Applied Chemistry, cilt.39 A, sa.9, ss.953-968, 2002 (SCI-Expanded, Scopus)
- Yayın Türü: Makale / Tam Makale
- Cilt numarası: 39 A Sayı: 9
- Basım Tarihi: 2002
- Doi Numarası: 10.1081/ma-120013573
- Dergi Adı: Journal of Macromolecular Science - Pure and Applied Chemistry
- Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
- Sayfa Sayıları: ss.953-968
- Anahtar Kelimeler: 2-Methylbenzyl methacrylate, 4-Methylbenzyl methacrylate, Methyl methacrylate, Reactivity ratios
- Uşak Üniversitesi Adresli: Evet
Özet
Two types of copolymers based on 2-methylbenzyl methacrylate and 4-methylbenzyl methacrylate with methyl methacrylate were synthesized. Several copolymers of 2-methylbenzyl methacrylate (2-MBZMA) and 4-methylbenzyl methacrylate (4-MBZMA) with methyl methacrylate (MMA) having different copolymer compositions were performed in 1,4-dioxane using 2,2′-azobisisobutyronitrile (AIBN) as a free radical initiator at 60 ± 1°C. The copolymers were characterized by FT-IR, 1H- and 13C-NMR spectroscopic techniques. The composition of monomeric units in the copolymer system was calculated using 1H-NMR spectroscopy by comparing the integral values of well separated aromatic and aliphatic proton peaks. The reactivity ratios were calculated by employing Fineman-Ross and Kelen-Tüdös methods. The values of r1 and r2 obtained by the Fineman-Ross and Kelen-Tüdös methods appear to be in close agreement with each other, i.e., r1(2-MBZMA): 1.03 ± 0.039 and r2(MMA): 0.77 ± 0.012 for the copoly(2-MBZMA-MMA) system, r1(4-MBZMA): 0.97 ± 0.040 and r2(MMA): 0.77 ± 0.050 for the copoly(4-MBZMA-MMA) system. Thermal stabilities of the homo- and co-polymers were investigated using thermogravimetric analysis, while differential scanning calorimetry was used to determine the glass transition temperature.