Zobrazeno 1 - 10
of 37
pro vyhledávání: '"R. S. Velichkova"'
Publikováno v:
Journal of Applied Polymer Science. 91:3251-3258
The structure and physicomechanical properties of nylon 6 (N-6) modified with polyethylene oxide–polyisoprene–polyethylene oxide (PEO-PI-PEO) copolymers via activated anionic polymerization have been investigated by using differential scanning ca
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::38c43d52837ca0e17bdc4f155c2816cb
https://doi.org/10.1002/app.13510
https://doi.org/10.1002/app.13510
Publikováno v:
Journal of Polymer Science Part A: Polymer Chemistry. 41:487-496
Block copolymers of the A-B-C-B-A type were synthesized for the first time via the activated anionic polymerization of hexanelactam (HL) with Na-HL as an initiator and macroactivators [or polymeric activators (PACs)] as elastificators for nylon-6. Th
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::c0d408904b2c8975a80332ad27fcb795
https://doi.org/10.1002/pola.10599
https://doi.org/10.1002/pola.10599
Autor:
R. S. Velichkova, P. Mihailova, O. Peshev, I. Uzunov, L. Lakov, S. D. Ivanova, D. Christova, P. Tzvetkova
Publikováno v:
Designed Monomers and Polymers. 6:11-21
Allyl-functionalized cyclotriphosphazenes (CPs) have been synthesized, characterized, and applied as cross-linking agents in the radical polymerization of 2-hydroxyethyl methacrylate (HEMA). The effect of the number of allylic substituents in the CP
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::1ceae954f11edb3dbcfa846235b8d748
https://doi.org/10.1163/156855503321127493
https://doi.org/10.1163/156855503321127493
Publikováno v:
Journal of Applied Polymer Science. 84:1448-1456
The structure, crystallization, and phase behavior of nylon6-b-polytetrahydrofuran-b-nylon6 triblock copolymers synthesized via activated anionic polymerization have been studied. The composition, molecular weight of polytetrahydrofuran (PTHF) soft b
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::2fa62ac977439167fda5f7551c998763
https://doi.org/10.1002/app.10448
https://doi.org/10.1002/app.10448
Autor:
R. S. Velichkova, D. Christova, O. Peshev, L. Lakov, S. D. Ivanova, P. Tzvetkova, P. Mihailova
Publikováno v:
Designed Monomers and Polymers. 4:329-341
New cyclotriphosphazene (CP) derivatives bearing two or six triethoxysilyl groups were synthesized via aminolysis of N3P3Cl6. With a view to decreasing the steric hindrance in the consequent sol-gel process, silane groups in a non-geminal position we
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::4f97d18de7036e17f00a553ed0d69191
https://doi.org/10.1163/156855501753210817
https://doi.org/10.1163/156855501753210817
Publikováno v:
Journal of Polymer Science Part A: Polymer Chemistry. 38:4154-4164
ABA-type copolymers were synthesized by the anionic polymerization of hexanelactam with the sodium salt of hexanelactam as an initiator and amino-terminated polytetrahydrofuran telechelic functionalized with diisocyanates. Two types of diisocyanates,
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::7e873d816cc52a18285a742009009be3
https://doi.org/10.1002/1099-0518(20001115)38:22<4154::aid-pola160>3.0.co
https://doi.org/10.1002/1099-0518(20001115)38:22<4154::aid-pola160>3.0.co
Publikováno v:
European Polymer Journal. 30:741-747
Poly(vinyl acetal)s with different degree of acetalization have been synthesized from poly(vinyl alcohol) and 4-dimethylaminobenzaldehyde. After quaternization and crosslinking they have been converted in ion exchange hydrogels. As quaternizing reage
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::e831d845c0aa26455faacd0fd16061cb
https://doi.org/10.1016/0014-3057(94)90125-2
https://doi.org/10.1016/0014-3057(94)90125-2
Publikováno v:
European Polymer Journal. 29:1129-1136
Various graft copolymers were obtained by ring-opening of succinic groups in styrene-isoprene block copolymers, modified with maleic anhydride, using reagents containing nucleophilic groups. Comblike hydrophilic graft copolymers were prepared using p
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::342336644fd44344bfddf78f5316fc1a
https://doi.org/10.1016/0014-3057(93)90321-6
https://doi.org/10.1016/0014-3057(93)90321-6
Autor:
Z. Mitov, R. S. Velichkova
Publikováno v:
European Polymer Journal. 29:603-607
A kinetic study of the addition of maleic anhydride to styrene-isoprene block copolymers at 60, 70 and 80° in the presence of α,α′-azoisobutyronitrile has been made using i.r. spectroscopy. The reaction is first order with respect to maleic anhy
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::0159e08e234121d16f9a84df7fd2cad3
https://doi.org/10.1016/0014-3057(93)90024-a
https://doi.org/10.1016/0014-3057(93)90024-a
Autor:
R. S. Velichkova, Z. Mitov
Publikováno v:
European Polymer Journal. 29:597-601
The mechanism and site of addition of maleic anhydride to styrene-isoprene block copolymers have been investigated. Conditions have been found for modification of the olefinic unsaturation up to 15–20% without crosslinking. 1 H-NMR and 13 C-NMR and
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::284e2db47d026f54959a655b8165dafa
https://doi.org/10.1016/0014-3057(93)90023-9
https://doi.org/10.1016/0014-3057(93)90023-9