title: Gamma-ray crosslinking of poly(3-hydroxyoctanoate-co-undecenoate).
abstract: The gamma-ray crosslinking of films made of poly(3-hydroxyoctanoate) containing undecenoate moieties (up to 33 mole%) were studied. X-ray diffraction, thermal analysis, dynamic mechanical analysis (DMA), solid state nuclear magnetic resonance (NMR) spectroscopy and degree of crosslinking (swelling analysis) as a function of irradiation dose were evaluated for treatments in air or in N(2) atmosphere. After uncrosslinked material was isolated by CHCl(3) extraction, solid state NMR data suggested that only a small percentage of the double bonds took part in the formation of irradiation crosslinks. Crosslinking in N(2) was more efficient than in air and a 20 kGy dose was sufficient for optimal crosslinking. The X-ray diffraction patterns of the polymer films were unaffected by moderate irradiation. The use of sodium hypochlorite to isolate poly(3-hydroxyoctanoate-co-undecenoate) samples resulted in partial chlorination of the double bonds and considerable depolymerization.
authors.affiliation: Centre de Recherche sur les Macromolecules Végetales, Université Joseph Fourier-BP 53, 38041 Grenoble Cedex 9, France.
authors.forename: A
authors.initials: A
authors.lastname: Dufresne
authors.forename: L
authors.initials: L
authors.lastname: Reche
authors.forename: R H
authors.initials: RH
authors.lastname: Marchessault
authors.forename: M
authors.initials: M
authors.lastname: Lacroix
mesh_terms: D001672:Biocompatible Materials / Q000138:chemical synthesis / Q000737:chemistry / Q000528:radiation effects; D001673:Biodegradation, Environmental; D003432:Cross-Linking Reagents; D018360:Crystallography, X-Ray; D005720:Gamma Rays; D009682:Magnetic Resonance Spectroscopy; D011091:Polyesters / Q000138:chemical synthesis* / Q000737:chemistry / Q000528:radiation effects; D013816:Thermodynamics
chemical_list: D001672:Biocompatible Materials; D003432:Cross-Linking Reagents; D011091:Polyesters; C439607:poly(3-hydroxyoctanoate-co-undecenoate)