Premium
Phase separation studies on poly(vinylidene fluoride) and poly(methyl methacrylate) quenched blends
Author(s) -
MartínezSalazar J.,
Canalda J. C.,
Vallejo B.
Publication year - 1994
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.19940780110
Subject(s) - materials science , small angle x ray scattering , methyl methacrylate , monomer , interphase , amorphous solid , annealing (glass) , methacrylate , glass transition , polymer chemistry , phase (matter) , poly(methyl methacrylate) , fluoride , polymer blend , polymer , chemical engineering , scattering , crystallography , copolymer , composite material , organic chemistry , chemistry , optics , biology , inorganic chemistry , physics , genetics , engineering
A combined study by SAXS and DSC on quenched blends of PVDF and PMMA is presented. Attention is focused on the first stage of the phase separation process during annealing that is shown to be mainly determined by the diffusion of the PVDF molecules from the amorphous blend phase towards the crystals growth front. The experimental monomer diffusion constants at T > T g are compared with those expected theoretically using the approximation of the fast model process and the WLF equation for the relaxation frequency of the monomer. The nature and composition of the crystal interphase are discussed in terms of the SAXS invariant for the whole system and the calorimetric data derived from the T g transitions observed.