Zobrazeno 1 - 10
of 15
pro vyhledávání: '"Päivi Pitkänen"'
Publikováno v:
Chemical Engineering Research and Design. 90:1517-1526
Methylaluminoxane microspheres were prepared using a hydrocarbon-in-perfluorocarbon-emulsion solvent extraction process. The effect of the preparation conditions on the size of the microspheres was investigated. As expected, the size of the microsphe
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::bbf8cbd36f77087a54d3a722fd6fe558
https://doi.org/10.1016/j.cherd.2012.02.008
https://doi.org/10.1016/j.cherd.2012.02.008
Publikováno v:
Journal of Dispersion Science and Technology. 33:234-244
Microspheres were prepared using a hydrocarbon-perfluorocarbon solvent extraction process. The effect of the physical properties and the emulsification conditions on the mean microsphere size was investigated. The viscosity of the dispersed and the c
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::187b9b8356038d8de2a1834bb0e23a81
https://doi.org/10.1080/01932691.2011.561166
https://doi.org/10.1080/01932691.2011.561166
Publikováno v:
Chemical Engineering & Technology. 33:1635-1644
Microspheres can be prepared using a hydrocarbon-perfluorocarbon-based solvent extraction process. The effect of changing the surfactant amount, emulsification temperature, and stirring speed on the size of microspheres was investigated. The surfacta
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::83dd601c5feb82d569cd70de2910d111
https://doi.org/10.1002/ceat.201000037
https://doi.org/10.1002/ceat.201000037
Autor:
John Severn, Esa Kokko, Päivi Pitkänen, Tapani A. Pakkanen, Janne Maaranen, Anneli Pakkanen, Mikko Linnolahti, Virve A. Karttunen
Publikováno v:
Journal of Organometallic Chemistry. 693:3915-3922
Ligand effects on chain termination reactions in hafnocene-catalyzed ethene polymerization process have been systematically studied by quantum chemical methods. β-hydrogen transfer to metal, β-hydrogen transfer to monomer and hydrogenolysis were st
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::e90a4f9547ecc9f07fe2d70e7c2fca05
https://doi.org/10.1016/j.jorganchem.2008.09.070
https://doi.org/10.1016/j.jorganchem.2008.09.070
Autor:
Päivi Pitkänen, Janne Maaranen, Virve A. Karttunen, John Severn, Esa Kokko, Mikko Linnolahti, Tapani A. Pakkanen
Publikováno v:
Organometallics. 27:3390-3398
The influence of the ligand structures of hafnocene polymerization catalysts on ethene insertion and chain propagation was systematically studied by quantum chemical methods. Altogether 54 hafnocenes were studied as a function of the ligand structure
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::c95d563949e263e39c7a190efa639e33
https://doi.org/10.1021/om800050d
https://doi.org/10.1021/om800050d
Autor:
Virve A. Karttunen, John Severn, Tapani A. Pakkanen, Anniina Turunen, Janne Maaranen, Päivi Pitkänen, Esa Kokko, Mikko Linnolahti
Publikováno v:
Journal of Organometallic Chemistry. 693:155-163
The influence of ligand structure of hafnocenes on activation of the polymerization catalysts has been studied by quantum chemical methods. Altogether 54 hafnocenes were included in the analysis, supplemented by four zirconocenes for comparison. The
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::99a6f7a245579188f4fcf0954125159f
https://doi.org/10.1016/j.jorganchem.2007.10.037
https://doi.org/10.1016/j.jorganchem.2007.10.037
Publikováno v:
Theoretical Chemistry Accounts. 118:899-913
The performance of quantum chemical methods for geometry prediction of hafnocenes was evaluated. HF, B3LYP and MP2 in combination with nonrelativistic (MHF) and relativistic (MWB and LANL2DZ) basis sets for hafnium together with standard basis sets 3
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::457b429407cf10daccdef394fcb9a8cf
https://doi.org/10.1007/s00214-007-0375-6
https://doi.org/10.1007/s00214-007-0375-6
Publikováno v:
Macromolecular Chemistry and Physics. 208:851-861
Six (Cp)(4-phenyl-indenyl)MCl2 (A) and four (Cp)(1-phenyl-indenyl)MCl2 (C) (M=Zr/Hf) based complexes were tested in ethene homo- and copolymerisation under different conditions to explain how the differences in the complex structure affect the polyme
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::654b30cd6c50092093bf53e6f8aed888
https://doi.org/10.1002/macp.200600595
https://doi.org/10.1002/macp.200600595
Publikováno v:
Polymer. 45:4623-4631
Accurate characterisation of the tacticity distribution in isotactic polypropylene is important for obtaining better structure property correlations and for the indirect investigation of the active sites in heterogeneous Ziegler–Natta catalysts. In
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::4763ae491793123e9080dc084d3accc2
https://doi.org/10.1016/j.polymer.2004.05.027
https://doi.org/10.1016/j.polymer.2004.05.027
Publikováno v:
Polymer. 45:3091-3098
Two polypropylene samples, one with relatively low isotacticity and the other with high isotacticity were fractionated using a series of solvents and temperatures. For both samples 4–9 fractions were collected and characterised with differential ca
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::c212804f853b1c58c05d4f51b77890bf
https://doi.org/10.1016/j.polymer.2004.02.060
https://doi.org/10.1016/j.polymer.2004.02.060