Zobrazeno 1 - 10
of 20
pro vyhledávání: '"Bohumil Bednář"'
Autor:
Karel Procházka, Jitka Trněná, Mats Almgren, Petr Svoboda, Bohumil Bednář, Bo Medhage, Emad Mukhtar
Publikováno v:
Polymer. 34:103-110
Diblock polystyrene- block -poly(hydrogenated isoprene) was fluorescence labelled by random covalent attachment of anthracene at the polystyrene block (the average number of anthracenes per copolymer chain was 0.88). Micellization of the labelled cop
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::f75b888af9278d3aa480107573d810e8
https://doi.org/10.1016/0032-3861(93)90290-q
https://doi.org/10.1016/0032-3861(93)90290-q
Publikováno v:
Collection of Czechoslovak Chemical Communications. 58:213-233
Theories allowing interpretation of the results of time-resolved polarization spectrofluorimetry in solutions are reviewed and their applicability under various conditions is discussed. For the reorientation of rigid molecules in an isotropic medium,
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::ef77a5d64148fc7fc547ef1c72199e27
https://doi.org/10.1135/cccc19930213
https://doi.org/10.1135/cccc19930213
Publikováno v:
Angewandte Makromolekulare Chemie. 192:145-153
The homogeneous polyaddition reaction of pyromellitic dianhydride with 4,4′-diaminodiphenylmethane was investigated. The dependence of the number average molecular weights on time has a maximum; low equilibrium values of Mn are caused by a disturbe
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::48860995064c5bb76204f124333c4265
https://doi.org/10.1002/apmc.1991.051920112
https://doi.org/10.1002/apmc.1991.051920112
Publikováno v:
European Polymer Journal. 27:487-491
Polyamic acids, polyimides and polyisoimides have been prepared from pyromellitic acid dianhydride and 1,n-bis(4-aminophenoxyalkanes). The synthesized polymers were characterized by physical and physico-chemical methods. The prepared polyimides and p
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::cf896b9bbe6ae6838188e2ef3115a3de
https://doi.org/10.1016/0014-3057(91)90172-k
https://doi.org/10.1016/0014-3057(91)90172-k
Publikováno v:
Die Makromolekulare Chemie. 191:2631-2637
Imidization of polyamic acid prepared from pyromellitic dianhydride and 4,4′-methylenedianiline was investigated at 373–493 K. At a certain degree of imidization, depending on the reaction temperature, the reaction is significantly slowed down. F
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::3c14789688c28e71b2dbaa9b1bd3fca3
https://doi.org/10.1002/macp.1990.021911111
https://doi.org/10.1002/macp.1990.021911111
Publikováno v:
Journal of Liquid Chromatography. 13:1765-1783
The shape of the SEC chromatogram of a reversibly associating system in the SEC is a result of several competing processes: (a) SEC mechanism, (b) re-equilibration of the perturbed association equilibrium, and (c) the axial dispersion of individual c
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::ffa8f9f29999d1bbc13629ffbb3525a3
https://doi.org/10.1080/01483919008048991
https://doi.org/10.1080/01483919008048991
Publikováno v:
J. Chem. Soc., Faraday Trans.. 86:1103-1108
Block copolymers in selective precipitants form multimolecular micelles via closed association, which is characterized by an equilibrium between a unimer (molecularly dissolved copolymer) and micelles. A theoretical model is developed which accounts
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::78aa92e535306811c6474d2c00be8609
https://doi.org/10.1039/ft9908601103
https://doi.org/10.1039/ft9908601103
Autor:
Jaroslav Straka, Miroslav Marek, Pavel Schmidt, Bohumil Bednář, Bohdan Schneider, Jaroslav Králíček
Publikováno v:
European Polymer Journal. 26:941-945
i.r. and 13C-CP-MAS-NMR spectra were recorded for polyamidocarboxylic acid, polyimide and polyisoimide based on pyromellitic acid dianhydride (PMDA) and 4,4′-diaminodiphenylmethane (MDA), and of polyimide based on PMDA and 4,4′-diaminodiphenyleth
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::45fd02d6587bdc8c079056cdeeb449c7
https://doi.org/10.1016/0014-3057(90)90105-d
https://doi.org/10.1016/0014-3057(90)90105-d
Publikováno v:
Polymer. 25:1178-1184
The behaviour of dilute solutions of a three-block copolymer poly[styrene-b-(ethene-co-butene)-b-styrene] in mixtures of tetrahydrofuran (THF)/ethanol was studied using viscometry, osmometry and light scattering. In solutions with a lower ethanol con
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::374db31dc2b48fe48cd10be31c7701f6
https://doi.org/10.1016/0032-3861(84)90360-4
https://doi.org/10.1016/0032-3861(84)90360-4
Publikováno v:
Die Makromolekulare Chemie. 183:203-210
Homopolymers of 2,3-epoxypropyl methacrylate with various molecular masses were prepared by solution polymerization with 2,2′-azoisobutyronitrile as initiator. The effect of polymerization conditions on the molecular parameters (weight- and number-
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::885aa4afe4c8742a900eb7b9d2480f67
https://doi.org/10.1002/macp.1982.021830118
https://doi.org/10.1002/macp.1982.021830118