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Diffusivities of Dialkyl Phthalates in Plasticized Poly(vinyl butyral): Impact on Binder Thermolysis
Author(s) -
Lewis Jennifer A.,
Cima Michael J.
Publication year - 1990
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1990.tb06749.x
Subject(s) - dibutyl phthalate , phthalate , polyvinyl butyral , diffusion , plasticizer , materials science , diethyl phthalate , dimethyl phthalate , thermal decomposition , fourier transform infrared spectroscopy , analytical chemistry (journal) , polymer chemistry , nuclear chemistry , chemical engineering , chemistry , composite material , organic chemistry , thermodynamics , physics , engineering
Hot‐stage/Fourier transform infrared microspectroscopy (FTIR‐M) was used to determine the diffusivities of a series of dialkyl phthalates in poly(vinyl butyral) (PVB) spin‐coated films. The diffusivities ranged from 10 −12 to 10 −10 cm 2 /s for the isotherms investigated (60° to 150°C). In their respective temperature regimes, dimethyl phthalate and diethyl phthalate exhibited nonlinear diffusion behavior, while dibutyl phthalate (DBP) and dioctyl phthalate (DOP) exhibited Fickian behavior in PVB. The activation energies for DBP and DOP diffusion in the PVB‐based films were calculated to be 76.3 and 114.7 kJ/mol, respectively. The diffusitivity of DBP was used to compare the relative importance of diffusion and capillary migration in the thermolysis of PVB‐DBP binders from ceramic greenware. Comparison of the calculated DBP loss due to diffusion alone could not account for the observed removal rates. A characteristic diffusion length is calculated from the experimental observations.