Zobrazeno 1 - 10
of 70
pro vyhledávání: '"N.Ya. Rapoport"'
Publikováno v:
Polymer Science U.S.S.R.. 28:943-951
A trimolecular mechanism is postulated for the reaction of polypropylene with oxygen, which represents the first step initiating the kinetic chain of oxidation. Crosslinking of polypropylene observed experimentally in the initial stages of oxidation
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::c2a8d02d70d0b48457b43ce63d5d71f5
https://doi.org/10.1016/0032-3950(86)90234-0
https://doi.org/10.1016/0032-3950(86)90234-0
Autor:
Gennadii E Zaikov, N.Ya. Rapoport
Publikováno v:
European Polymer Journal. 20:409-414
The influence of tensile stress on different stages of the chain oxidation of polypropylene (PP) has been studied. The degrees of oxidation at various sites of the stressed samples, oxidized up to failure, were determined by i.r. spectroscopy using a
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::ae9303c3e0991ecb927024d3f82cffdf
https://doi.org/10.1016/0014-3057(84)90069-7
https://doi.org/10.1016/0014-3057(84)90069-7
Autor:
N.Ya. Rapoport, Gennadii E Zaikov
Publikováno v:
Russian Chemical Reviews. 52:897-916
The characteristics of the kinetics and mechanism of the chain oxidation of stressed polymers are considered as a result of structural and conformational changes occurring in polymer matrices under the influence of mechanical stresses. Attention has
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::7c374f82888705c9d7802bac19a58f2a
https://doi.org/10.1070/rc1983v052n09abeh002899
https://doi.org/10.1070/rc1983v052n09abeh002899
Autor:
N.Ya. Rapoport, V.B. Miller
Publikováno v:
Polymer Science U.S.S.R.. 18:2678-2683
Transition from equilibrium compact conformations of macromolecular segments in the amorphous phase of isotropic polymers to elongated conformations in oriented samples markedly reduces the yield of hydroperoxide per mole absorbed oxygen in oxidation
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::41fc285faa2653bd29764419ae563014
https://doi.org/10.1016/0032-3950(76)90200-8
https://doi.org/10.1016/0032-3950(76)90200-8
Publikováno v:
Polymer Science U.S.S.R.. 18:2586-2590
The durability of isotactic PP films with drawing ratios in the range 850–900 has been investigated at 130°, under a constant load, varying the oxygen pressures, as well as at 130° with the oxygen pressure at 600 torr, with differences in the str
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::435cc53b18c59b7fdad03a6c5ee9dcf1
https://doi.org/10.1016/0032-3950(76)90185-4
https://doi.org/10.1016/0032-3950(76)90185-4
Publikováno v:
Polymer Science U.S.S.R.. 21:1851-1857
The rotational and translational diffusion of a spin probe in isotropic and orientated polypropylene is investigated. It is shown that when a free radical probe is introduced into the polymer after it has been stretched, the main factors affecting it
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::d51c8de8cdd308fea8a1b28b7570a6da
https://doi.org/10.1016/0032-3950(79)90091-1
https://doi.org/10.1016/0032-3950(79)90091-1
Publikováno v:
Polymer Science U.S.S.R.. 21:2286-2295
A definition of the induction period of polyolefin oxidation is proposed. It may be regarded as the time after which the oxidation kinetics are subject to regularities peculiar to reactions involving degenerate chain branching and mutual termination
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::9d710d07e6ac3271a51d24304a7a5fe9
https://doi.org/10.1016/0032-3950(79)90168-0
https://doi.org/10.1016/0032-3950(79)90168-0
Publikováno v:
Polymer Science U.S.S.R.. 20:2127-2134
A study was made of the durability of oriented isotactic PP under conditions of thermal oxidative degradation and in vacuum ( T = 130°) over a wide range of tensile stress. It was shown that under conditions of elastic deformation of samples durabil
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::cd2199d8785a05205c19079641746933
https://doi.org/10.1016/0032-3950(78)90340-4
https://doi.org/10.1016/0032-3950(78)90340-4
Publikováno v:
Polymer Science U.S.S.R.. 28:1370-1380
The kinetics of the decay of peroxide radicals of polypropylene and poly-4-methylpentene-1 in oxygen and an inert atmosphere has been studied. It is shown that the presence of reactive mobile side groups in poly-4-methylpentene-1 removes the “confo
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::99faec512788816c5561eb4e5bb6d476
https://doi.org/10.1016/0032-3950(86)90128-0
https://doi.org/10.1016/0032-3950(86)90128-0
Publikováno v:
Polymer Science U.S.S.R.. 30:1734-1741
The role of mechanical stresses in the advent and development of foci of oxidation in stressed oriented samples of isotactic PP in conditions of intense oxidation has been investigated. It has been established that the foci of the highest speed of in
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::2fe97f63db064e3de49706ab750a23d1
https://doi.org/10.1016/0032-3950(88)90397-8
https://doi.org/10.1016/0032-3950(88)90397-8