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Preparation and characterization of anionic collagen: P(VDF/TrFE) composites
Author(s) -
Goissis Gilberto,
Piccirilli Luciana,
De Guzzi Plepis Ana Maria,
DasGupta Dilip K.
Publication year - 1999
Publication title -
polymer engineering and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.503
H-Index - 111
eISSN - 1548-2634
pISSN - 0032-3888
DOI - 10.1002/pen.11437
Subject(s) - materials science , membrane , composite number , cationic polymerization , scanning electron microscope , aqueous solution , infrared spectroscopy , composite material , hydrogen bond , polymer chemistry , molecule , chemistry , organic chemistry , biochemistry
Abstract Anionic collagen:P(VDF/TrFE) (75/25) membrane composites were prepared by mixing anionic collagen and P(VDF/TrFE) in aqueous concentrated acetic acid:dimethylsulfoxide solutions and characterized by infrared, electron scanning microscopy, thermal analysis and dielectric properties. The results show that under the appropriate conditions anionic collagen:P(VDF/TrFE) composites, with ratios in the range from 4:1 to 1:4 may be conveniently prepared in the form of membranes, without the loss of tropocollagen secondary structure. As suggested by infrared spectroscopy and thermal analysis, mixing is accompanied by macromolecular interaction conditions anionic collagen and P(VDF/TrFE). Although preliminary, the determined pyroelectric coefficient for the 1:1 composite of 1.89 × 10 −4 Cm −2 K −1 , is higher than those determined under the same conditions for native, anionic collagen and P(VDF/TrFE) and of respectively 0.37 × 10 −4 Cm −2 K −1 , 1.16 × 10 −4 Cm −2 K −1 and 17 × 10 −6 Cm −2 K −1 , but comparable to that for PZT (4.2 × 10 −4 Cm −2 K −1 ) at the same temperature. This increase in pyroelectric coefficient for the 1:1 composite, in respect to anionic collagen membranes, may be a result of a anionic collagen: P(VDF/TrFE) interaction. A model based on hydrogen bonding formation between acidic and alcoholic hydroxyl groups of anionic collagen and the flurine atoms of P(VDF/TrFE) is proposed.