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Estimation of Morphology Characteristics of Porous Poly(propylene) Particles from Degassing Measurements
Author(s) -
Bobak Marek,
Gregor Tomas,
Bachman Bernd,
Kosek Juraj
Publication year - 2008
Publication title -
macromolecular reaction engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.37
H-Index - 32
eISSN - 1862-8338
pISSN - 1862-832X
DOI - 10.1002/mren.200700041
Subject(s) - gravimetric analysis , morphology (biology) , porosity , polymer , diffusion , particle (ecology) , polymerization , materials science , chemical engineering , polyolefin , particle size distribution , particle size , porous medium , polymer chemistry , chemistry , nanotechnology , composite material , thermodynamics , geology , physics , organic chemistry , paleontology , oceanography , layer (electronics) , engineering
The transport of reaction species in polyolefin particles affects both the polymerization and the degassing of the powder in the down‐stream processing. The morphology of particles – that is, the distribution of polymer and pore phases – predetermines their degassing behavior. We utilize gravimetric measurements to obtain the dynamics of degassing and to determine morphology characteristics of porous poly(propylene) particles. We found that Fick's diffusion model is not generally capable of fitting the shape of degassing curves of porous particles. Therefore we propose a particle model including two sizes of compact polymer granules and demonstrate that the degassing can be described by this model and that the model is capable of estimating fractions of large and small compact zones and the size of large compact zones.