Zobrazeno 1 - 10
of 69
pro vyhledávání: '"Ye.B. Lyudvig"'
Autor:
B.G. Belen'kaya, Ye.B. Lyudvig
Publikováno v:
Polymer Science U.S.S.R.. 21:1373-1380
The equilibrium concentration and the stability of the three types of cations, present in the system during the cationic polymerization of ϵ-caprolactone (CP) will sharply decrease as indicated. There will be no ionic associations in the presence of
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::eeb0c570e52385527c28808223ef2a65
https://doi.org/10.1016/0032-3950(79)90041-8
https://doi.org/10.1016/0032-3950(79)90041-8
Publikováno v:
Polymer Science U.S.S.R.. 16:924-930
It is shown that in the cationic polymerization of β-propiolactone the introduction of ketones into a system leads to a bimolecular chain termination reaction. Kinetically this is reflected in a deviation of the reaction rate from first order with r
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::fac186b7b66ca7efbe42680ad289b26d
https://doi.org/10.1016/0032-3950(74)90200-7
https://doi.org/10.1016/0032-3950(74)90200-7
Autor:
B.G. Belen'kaya, Yu.P. Vauchskii, A.A. Vel'ts, A.L. Izyumnikov, Ye.D. Rogozhkina, Ye.B. Lyudvig
Publikováno v:
Polymer Science U.S.S.R.. 28:1976-1984
The mechanism of the cationic polymerization of ϵ-caprolactone initiated by p -toluenesulphonic acid in the presence of ethylene glycol was studied. Ethylene glycol sharply increases the rate of the process, transforming it to the hydroxomechanism w
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::89f0576d2a3e1a9fafcff19e6206adb0
https://doi.org/10.1016/0032-3950(86)90421-1
https://doi.org/10.1016/0032-3950(86)90421-1
Publikováno v:
Polymer Science U.S.S.R.. 28:2464-2471
The kinetics and mechanism of cationic copolymerization of glycolide with L - and D , L -lactide under the action of SnCl 2 ·2H 2 O in the melt at 140–180°C is studied by PMR spectroscopy and gravimetric methods. The kinetics of the consumption o
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::5ba7b2dc37e9f97c8e5d158c4224b076
https://doi.org/10.1016/0032-3950(86)90069-9
https://doi.org/10.1016/0032-3950(86)90069-9
Autor:
Ye.B. Lyudvig, B.G. Belen'kaya
Publikováno v:
Polymer Science U.S.S.R.. 20:639-646
The rate of β-propiolactone (PL) polymerization over (C2H5)2HOSbF6 as initiator in CH2Cl2 or CH3NO2 is described by the equation: v=kpKc12 [M]/[M]0χ (12 ⩽ χ ⩽2) typical for the cationic polymerization of lactones on triplet ions. The process m
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::d5700ce8062fbf13102240f5bc486a16
https://doi.org/10.1016/0032-3950(78)90150-8
https://doi.org/10.1016/0032-3950(78)90150-8
Publikováno v:
Polymer Science U.S.S.R.. 17:3133-3140
The polymerization of glycolide in a melt containing SbF3 proceeds to 100% conversion in the temperature interval 160–175° and the number of active centres increases with time. The polymerization process features reactions of chain propagation and
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::dd5aff9c243267752068ca5ec76fa1b6
https://doi.org/10.1016/0032-3950(75)90344-5
https://doi.org/10.1016/0032-3950(75)90344-5
Publikováno v:
Polymer Science U.S.S.R.. 20:2219-2226
The heat content, C ° p , of ϵ-caprolactone (CL) and of its polymer (PCL) were determined between 13·8–350°K within 0·3% error limits. The temperatures and the enthalpies of their transitions were also investigated. The values of H °( T ), S
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::b2a03ec6666db211cefa938d0a642ab4
https://doi.org/10.1016/0032-3950(78)90388-x
https://doi.org/10.1016/0032-3950(78)90388-x
Publikováno v:
Polymer Science U.S.S.R.. 24:306-313
Kinetic and PMR spectroscopic methods have been used to investigate the cationic polymerization of e-caprolactone initiated by (C 2 H 5 ) 3 O+SbF − in the presence of ethylene glycol at 20–60°C. Alcohols markedly increase the rate of polymerizat
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::46b0e370fd47fdce55fa1888dda9f35a
https://doi.org/10.1016/0032-3950(82)90176-9
https://doi.org/10.1016/0032-3950(82)90176-9
Publikováno v:
Polymer Science U.S.S.R.. 25:1491-1497
A study was made of cationic polymerization of dl-lactide in melt with and SnCl2·2H2O initiators. Up to 70–80% conversion the process is independent of the concentration of components and is described by the empirical equation −d[M]/dt = keff, w
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::7b7021bfdc60f8f161b5da6e93cbc3ca
https://doi.org/10.1016/0032-3950(83)90087-4
https://doi.org/10.1016/0032-3950(83)90087-4
Publikováno v:
Polymer Science U.S.S.R.. 18:1941-1951
Taking as an example the polymerization of β-propiolactone in the presence of hydroxylic compounds with initiators of different types, it is shown that the hydroxomechanism observed previously in polymerization of β-propiolactone by oxonium salts i
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::2c342d041cf737dc2f76cd3e6dff7731
https://doi.org/10.1016/0032-3950(76)90375-0
https://doi.org/10.1016/0032-3950(76)90375-0