title: Modification of poly(3-hydroxybutyrate-co-3-hydroxyvalerate) film by chemical graft copolymerization.
abstract: The graft copolymerization of 2-hydroxyethylmethacrylate (HEMA) onto poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBHV) films has been investigated. The graft copolymerization was conducted in aqueous media using benzoyl peroxide (BPO) as chemical initiator. PHBHV films were prepared by solvent casting. Different parameters affecting the graft yield were studied such as monomer concentration, initiator concentration, and reaction time. The extent of grafting has been modulated by the preparation conditions, in particular the concentration of HEMA. However, it is interesting to note that the initiator concentration had only a slight influence on the graft yield. Characterization of the grafted PHBHV films assumed that the graft copolymerization not only occurred on the film surface but also took place into the film bulk. Differential scanning calorimetry showed that crystallinity dramatically decreased with increasing graft yield, indicating that graft copolymerization hindered the crystallization process. Wettability has been obviously improved by grafting a hydrophilic monomer such as HEMA for high graft yield (>130%).
authors.affiliation: Laboratoire de Recherche sur les Polymères, UMR-CNRS 7581, 2-8 rue H Dunant, 94320 Thiais, France.
authors.forename: Hoi-Kuan
authors.initials: HK
authors.lastname: Lao
authors.forename: Estelle
authors.initials: E
authors.lastname: Renard
authors.forename: Isabelle
authors.initials: I
authors.lastname: Linossier
authors.forename: Valérie
authors.initials: V
authors.lastname: Langlois
authors.forename: Karine
authors.initials: K
authors.lastname: Vallée-Rehel
mesh_terms: D002152:Calorimetry, Differential Scanning; D003460:Crystallization; D008689:Methacrylates / Q000737:chemistry*; D011091:Polyesters / Q000737:chemistry*; D011102:Polyhydroxyethyl Methacrylate / Q000737:chemistry*; D011108:Polymers / Q000138:chemical synthesis; D017155:Wettability; D000094122:Polyhydroxybutyrates
chemical_list: D008689:Methacrylates; D011091:Polyesters; D011102:Polyhydroxyethyl Methacrylate; D011108:Polymers; C052620:poly(3-hydroxybutyrate)-co-(3-hydroxyvalerate); D000094122:Polyhydroxybutyrates; C005044:hydroxyethyl methacrylate