J. Leiza - Academia.edu (original) (raw)
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Swiss Federal Institute of Technology (ETH) & University of Zurich
Rheinische Friedrich-Wilhelms-Universität Bonn
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Papers by J. Leiza
Chemical Engineering Science, 1996
Reaction calorimetry was used to monitor and control unseeded semi-batch emulsion copolymerizatio... more Reaction calorimetry was used to monitor and control unseeded semi-batch emulsion copolymerization of VAc and BuA. An external PC, using the information derived from a commercial reaction calorimeter, calculated on-line the thermal and material balances of the calorimetric reactor, and thus the monomer conversions. For a desired copolymer composition profile, previously calculated conversion-dependent monomer feed profiles were used to determine
Polymer, 1995
A new approach to estimate conversion and copolymer composition in semicontinuous emulsion copoly... more A new approach to estimate conversion and copolymer composition in semicontinuous emulsion copolymerization systems based on calorimetric measurements was developed. The proposed approach was checked for two different monomer systems: butyl acrylate-styrene and vinyl acetate—butyl acrylate. The estimated values of conversion and copolymer composition obtained from calorimetric data were compared with measurements of conversion and cumulative copolymer composition by gravimetry,
Macromolecules, 2000
... Gurutze Arzamendi and Jose Ramon Leiza. Industrial & Engineering Chemistry Research 2008 ... more ... Gurutze Arzamendi and Jose Ramon Leiza. Industrial & Engineering Chemistry Research 2008 47 (16), 5934-5947. ... Michael Buback, Pascal Hesse, Thomas Junkers, Tatiana Sergeeva, and Thomas Theis. Macromolecules 2008 41 (2), 288-291. ...
Macromolecular Symposia, 2002
ABSTRACT
Journal of Applied Polymer Science, 2001
The adhesive properties (tack, shear, and peel) of 2-ethyl hexyl acrylate/ methyl methacrylate co... more The adhesive properties (tack, shear, and peel) of 2-ethyl hexyl acrylate/ methyl methacrylate copolymer latex particles of different composition profiles (constant, positive, and negative gradients) but similar molecular weight distributions were studied. The composition profile had a strong effect on tack in the region of low molecular weights (weight-average molecular weight Յ 100,000 g/mol), but this effect was less important for higher molecular weights. No effect of the composition profile on shear or peel was observed for low-molecular-weight latices; nevertheless, for higher molecular weights (400,000 g/mol), resistance to shear strongly increased as heterogeneity increased, and resistance to peel was higher for gradient profiles.
Chemical Engineering Journal, 2002
Chemical Engineering Science, 1996
Reaction calorimetry was used to monitor and control unseeded semi-batch emulsion copolymerizatio... more Reaction calorimetry was used to monitor and control unseeded semi-batch emulsion copolymerization of VAc and BuA. An external PC, using the information derived from a commercial reaction calorimeter, calculated on-line the thermal and material balances of the calorimetric reactor, and thus the monomer conversions. For a desired copolymer composition profile, previously calculated conversion-dependent monomer feed profiles were used to determine
Polymer, 1995
A new approach to estimate conversion and copolymer composition in semicontinuous emulsion copoly... more A new approach to estimate conversion and copolymer composition in semicontinuous emulsion copolymerization systems based on calorimetric measurements was developed. The proposed approach was checked for two different monomer systems: butyl acrylate-styrene and vinyl acetate—butyl acrylate. The estimated values of conversion and copolymer composition obtained from calorimetric data were compared with measurements of conversion and cumulative copolymer composition by gravimetry,
Macromolecules, 2000
... Gurutze Arzamendi and Jose Ramon Leiza. Industrial & Engineering Chemistry Research 2008 ... more ... Gurutze Arzamendi and Jose Ramon Leiza. Industrial & Engineering Chemistry Research 2008 47 (16), 5934-5947. ... Michael Buback, Pascal Hesse, Thomas Junkers, Tatiana Sergeeva, and Thomas Theis. Macromolecules 2008 41 (2), 288-291. ...
Macromolecular Symposia, 2002
ABSTRACT
Journal of Applied Polymer Science, 2001
The adhesive properties (tack, shear, and peel) of 2-ethyl hexyl acrylate/ methyl methacrylate co... more The adhesive properties (tack, shear, and peel) of 2-ethyl hexyl acrylate/ methyl methacrylate copolymer latex particles of different composition profiles (constant, positive, and negative gradients) but similar molecular weight distributions were studied. The composition profile had a strong effect on tack in the region of low molecular weights (weight-average molecular weight Յ 100,000 g/mol), but this effect was less important for higher molecular weights. No effect of the composition profile on shear or peel was observed for low-molecular-weight latices; nevertheless, for higher molecular weights (400,000 g/mol), resistance to shear strongly increased as heterogeneity increased, and resistance to peel was higher for gradient profiles.
Chemical Engineering Journal, 2002