view:25195 Last Update: 2018-10-20
Mojtaba Abbasian, Sohrab Rahmani, Reza Mohammadi, Ali Akbar Entezami|
Graft Copolymerization of Styrene or Methyl Methacrylate onto Syndiotactic Polystyrene by ATRP Technique
کوپلیمر یزاسیون پیوندی استایرن یا متیل متاکریلات برروی پلی استایرن سیندیوتاکتیک با تکنیک ATRP
Functionalized syndiotactic polystyrene (sPS) copolymers, including sPS-graft-atactic polystyrene (aPS) copolymer or sPS-graft-poly(methyl methacrylate) (PMMA) copolymer, were synthesized and characterized. sPS has been synthesized by using half sandwich titanocene/methylaluminoxane catalyst in homogenous conditions. Then, a-phenyl chloroacetylation of sPS was accomplished in a heterogeneous process by using carbon disulfide as dispersing medium and a-phenyl chloroacetyl chloride and anhydrous aluminum chloride as acetylating agent and catalyst, respectively. The graft copolymer of sPS with aPS or PMMA were synthesized by atom transfer radical polymerization using a-phenyl chloroacethylated sPS as initiator and CuBr and bipyridine as catalyst. The structure of obtained copolymer was investigated by 1H NMR, FTIR spectroscopy, and thermal behavior of copolymers was performed by differential scanning calorimetry analyses.