Zobrazeno 1 - 10
of 57
pro vyhledávání: '"V, Chrástová"'
Publikováno v:
European Polymer Journal. 32:153-158
A monomer mixture of styrene (St) and maleic anhydride (MA) was grafted on isotactic polypropylene (PP) powder at 80 °C in benzene. During that process ungrafted copolymer is formed at the same time. The initiators are peroxide groups formed on the
Publikováno v:
Acta Polymerica. 41:293-297
The copolymerization of styrene with maleic anhydride initiated with hydroperoxides of isotactic powdered polypropylene in the presence of an activator and a nonionic emulsifier was studied. In the investigated system the initiator forms a solid phas
Publikováno v:
Makromolekulare Chemie. Macromolecular Symposia. 31:237-248
The contribution refers to the possibility of using emulsion polymerization of styrene, initiated by a heterogeneous initiator Chydroperoxide of isotactic powdered polypropylene) in the presence of a complex type activator, for the synthesis of block
Publikováno v:
Polymer. 22:1054-1057
Extremely high molecular weight polystyrenes with a M w in the range 10.8 × 10 6 to 2.2 × 10 7 were prepared by emulsion polymerization initiated with a heterogeneous initiator at 30°C, which has a ‘living character’. Samples of polystyrene we
Publikováno v:
European Polymer Journal. 21:89-92
I.R. analysis of isotactic powdered polypropylene containing acrylic acid grafts, with acidic groups esterified with epichlorohydrin, has revealed that the carbonyl contents gradually increase when the esterification is carried out at 90 to 120° whi
Publikováno v:
European Polymer Journal. 12:627-630
Hydroperoxides of oxidized powdered isotactic polypropylene have an unfavourable influence on the modification of polypropylene by styrene in the presence of chelate Fe 2+ -triethylenetetramine in emulsion at 30°. Elimination of hydroperoxides from
Publikováno v:
Acta Polymerica. 36:252-255
Charakteristische Konstanten fur die Veresterung der Carboxylgruppen der auf isotaktisches Polypropylen gepfropften Acrylsaure mit Phenylglycidylether als Modellsubstanz wurden bestimmt. Die Unterschiede dieser an der festen Phase durchgefuhrten Reak
Publikováno v:
European Polymer Journal. 10:551-556
High molecular weight monodisperse polystyrene has been prepared in an emulsion system by using powdered oxidized isotactic polypropylene as an initiator together with triethylenetetramine as an activator. Rate of polymerization increases linearly wi
Publikováno v:
European Polymer Journal. 13:661-664
By analytical determination of peroxides of powdered isotactic polypropylene capable of initiating polymerization in an emulsion system at 30°, it was proved that binding of styrene on polypropylene occurs only when the polymerization activator (e.g
Publikováno v:
European Polymer Journal. 21:85-88
Polyacrylic acid grafts on isotactic polypropylene powder may be esterified with epichlorohydrin via its epoxygroup at 60–90° heterogeneously without using a catalyst. Under these conditions, the rate constant was in the range 4 × 10 to 39 × 10