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Brush Type Copolymers of Poly(3‐hydroxybutyrate) and Poly(3‐hydroxyoctanoate) with Same Vinyl Monomers via “Grafting From” Technique by Using Atom Transfer Radical Polymerization Method
Author(s) -
Arslan Hülya,
Yeşilyurt Nazlı,
Hazer Baki
Publication year - 2008
Publication title -
macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 1022-1360
DOI - 10.1002/masy.200850905
Subject(s) - polymer chemistry , atom transfer radical polymerization , copolymer , monomer , styrene , gel permeation chromatography , grafting , chloroform , solvent , polymerization , materials science , polymer , chemistry , organic chemistry
Abstract Brush type graft copolymers of poly(3‐hydroxybutyrate) (PHB) and poly(3‐hydroxyoctanoate) (PHO) with methylmethacrylate, (MMA), styrene, (S), and n‐butylmethacrylate, (n‐BuMA) were obtained by using Atom Transfer Radical Polymerization Method, (ATRP), via “grafting from” technique. Firstly PHB and PHO were chlorinated by passing chlorine gas through their solution in CHCl 3 /CCl 4 (75/25 v/v) mixture and CCl 4 , respectively, in order to prepare chlorinated PHB, PHB‐Cl, and chlorinated PHO, PHO‐Cl, with different chlorine contents. The determination of the chlorine content in chlorinated poly(3‐hydroxyalkanoate) (PHA‐Cl) was performed by the Volhard Method. Then ATRP of vinyl monomers was initiated by using PHA‐Cl as macroinitiators in the presence of cuprous chloride (CuCl)/2,2′‐bipyridine complex as catalyst, at 90 °C in order to obtain brushes containing PHAs. The polymer brushes were fractionated by fractional precipitation methods and the γ values calculated from the ratio of the volume of nonsolvent (methanol) and the volume of solvent (chloroform) of brushes varied between 0.82 and 6.50 depending on the composition of brushes. The polymer products were characterized by gel permeation chromatography (GPC), 1 H NMR, FTIR, thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC) techniques.