Water adsorption on and desorption from crystalline copolymers of vinylidene fluoride with trifluoroethylene.
Water adsorption and absorption on crystalline polyvinylidene fluoride with 30% trifluoroethylene, P(VDF-TrFE, 70:30), was examined by thermal desorption spectroscopy. Two distinctly different water adsorption sites are identified: one adsorbed species that resembles ice and another species that interacts more strongly with the polymer thin film. The existence of the latter species is consistent with X-ray diffraction studies of water absorbed into the bulk of copolymers of polyvinylidene fluoride with trifluoroethylene crystalline thin films. There are strong steric effects observed in the angle-resolved thermal desorption that may be a result of the large polymer thin film surface dipoles.
Rosa
Luis G
LG
Behlen Laboratory of Physics, Department of Physics and Astronomy and the Center for Materials Research and Analysis, University of Nebraska-Lincoln, Lincoln, Nebraska 68588-0111, USA.
Jacobson
P A
PA
Dowben
P A
PA
D000327:Adsorption; D003460:Crystallization; D006845:Hydrocarbons, Fluorinated / Q000737:chemistry*; D011108:Polymers / Q000737:chemistry*; D014753:Vinyl Compounds / Q000737:chemistry*; D014867:Water / Q000737:chemistry
D006845:Hydrocarbons, Fluorinated; D011108:Polymers; D014753:Vinyl Compounds; D014867:Water; C007384:1,1-difluoroethylene; C074585:trifluoroethene