Synthesis and Characterization of Well-Defined Poly(2- hydroxyethyl methacrylate-co-styrene)-graft-poly( - caprolactone) by Sequential Controlled Polymerization
نویسندگان
چکیده
A new graft copolymer, poly(2-hydroxyethyl methacrylate-co-styrene) -graft-poly( -caprolactone), was prepared by combination of reversible addition-fragmentation chain transfer polymerization (RAFT) with coordination-insertion ringopening polymerization (ROP). The copolymerization of styrene (St) and 2-hydroxyethyl methacrylate (HEMA) was carried out at 60 °C in the presence of 2-phenylprop-2-yl dithiobenzoate (PPDTB) using AIBN as initiator. The molecular weight of poly (2hydroxyethyl methacrylate-co-styrene) [poly(HEMA-co-St)] increased with the monomer conversion, and the molecular weight distribution was in the range of 1.09 1.39. The ring-opening polymerization (ROP) of -caprolactone was then initiated by the hydroxyl groups of the poly(HEMA-co-St) precursors in the presence of stannous octoate (Sn(Oct)2). GPC and H-NMR data demonstrated the polymerization courses are under control, and nearly all hydroxyl groups took part in the initiation. The efficiency of grafting was very high. © 2004 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 42:
منابع مشابه
Living cationic sequential block copolymerization: synthesis and characterization of poly(4-(2-hydroxyethyl)styrene-b-isobutylene-b-4-(2-hydroxyethyl)styrene) triblock copolymers
INTRODUCTION With the development of living cationic polymerization of isobutylene (IB)1 and styrenic monomers,2–5 the synthesis of ABA triblock copolymer thermoplastic elastomers (TPEs) with polyisobutylene (PIB) as rubbery middle segments and styrenic polymers as plastic outer segments became possible. TPEs with PIB rubbery segments inherently exhibit superior oxidative, chemical and thermal ...
متن کاملA Novel Initiator of [5-(benzyloxy)-4-oxo-4H-pyran-2-yl]methyl-2-bromo-2-methylpropanoateas in Atom Transfer Radical Polymerization of Styrene and Methyl Methacrylate
A novel nano-initiator containing kojic acid moiety, [5-(benzyloxy)-4-oxo-4H-pyran-2-yl)methyl-2-bromo-2-methylpropanoate was synthesized by the reaction of 5-(benzyloxy)-2-(hydroxymethyl)-4H-pyran-4-one with 2-bromoisobutyryl bromide in triethylamine and used as initiator in the atom transfer radical polymerization (ATRP) of styrene and methyl methacrylate in the presence of Cu(0)/CuCl2and N,N...
متن کاملSynthesis and Characterization of Poly(ethylene-co-vinyl alcohol)-graft-poly(ε-caprolactone)
Graft poly(ε-caprolactone)s (PCLs) with high graft density were synthesized by using random copolymer poly(ethylene-co-vinyl alcohol) (EVOH) to initiate ring-opening polymerization of ε-caprolactone, with and without cocatalyst Sn(Oct)2. The graft copolymer were characterized by IR, 1H and 13C NMR. The solution property and the crystallization behavior were also investigated.
متن کاملControlled Radical Polymerization of methyl methacrylate and styrene mediated by a cobalt(II)-based initiatior system
The role of cobalt(II) complexes containing 2-formylpyrrolyl chelating ligands and phosphine ligands combined with a bromo-alkyl ester, an alkyl bromide or an azo compound in the formation of suitable initiator systems for vinyl monomer controlled radical polymerization was studied. The formation of syndiotactic-rich (Pr>0.7) poly(methyl methacrylate) (PMMA) and atactic (Pr=0.49) poly(styrene) ...
متن کاملSynthesis of Michael Acceptor Ionomers of Poly(4-Sulfonated Styrene-co-Poly(Ethylene Glycol) Methyl Ether Acrylate).
Ionomers containing sodium 4-styrene sulfonate (4SS) and poly(ethylene glycol) methyl ether acrylate (PEGA) were synthesized by reversible addition-fragmentation chain transfer (RAFT) polymerization. The polymerization was mediated by 1-phenylethyl dithiobenzoate chain transfer agent in a dimethylformamide/water solvent system. Well-defined copolymers of pPEGA-co-4SS were produced with molecula...
متن کامل