Copolymerization and Copolymers of 2, 4, 5-Tribromostyrene with Methyl Acrylate and Methyl Methacrylate (CROSBI ID 78833)
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Podaci o odgovornosti
Janović, Zvonimir ; Tomašek, Ljubica
engleski
Copolymerization and Copolymers of 2, 4, 5-Tribromostyrene with Methyl Acrylate and Methyl Methacrylate
2, 4, 5-Tribromostyrene (TBSt) was copolymerized with methyl acrylate (MA) or methyl methacrylate (MMA) in a toluene solution using 2, 2"-azobisisobutyronitrile as free radical initiator. The copolymerization reactivity ratios were found to be for the system TBSt/MA r_1=7.4+1.2 (TBSt) and r_2=0.1+1.4 (MA) and for the system TBSt/MMA r_1=1.8+0.2 (TBSt) and r_2= 0.1+0.2 (MMA). The e and Q values were also calculated. The initial rate of copolymerization, as well as molecular weight of the obtained copolymers for both system linearly increase as the contect of TBSt in the monomer mixture increases. Similar behavior has also been established for the course of the copolymerization reactions to high conversions. The resulting copolymers rapidly decompose at temperatures 20-800^oC above the decomposition of corresponding (metha)crylate hompolymers. However, the glass transition temperature increases markedly with increasing TBS content.
Tribromostyrene; Methyl acrylate; Methyl methacrylate; Copolymerization; Thermal stability
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Podaci o izdanju
A34 (12)
1997.
2471-2481
objavljeno
1060-1325