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1.
Zauresh S. Nurkeeva Al-Sayed Abdel Aal Vitaliy V. Khutoryanskiy Grigoriy A. Mun Aida G. Beksyrgaeva 《Radiation Physics and Chemistry》2003,67(6):717-722
Gamma-radiation grafting of vinyl ether of monoethanolamine and vinyl ether of ethyleneglycol (VEEG) on polyethylene films has been studied from binary monomer mixtures. The effect of co-monomer composition and total exposure radiation dose on the grafting process is investigated. A combination of potentiometric and gravimetric techniques is applied to determine the grafting degree of each monomer in the final graft copolymer. The presence of more active monomer VEEG in the mixture was found to enhance the grafting of both monomers because the increasing of copolymerization rate which in turn increases the total grafting degree. The modification of the hydrophilic properties of the graft copolymer is studied by examining the grafted films for water- and copper (II) ions uptake. 相似文献
2.
G.?A.?Mun I.?K.?Nam R.?R.?SarsengalievEmail author Z.?S.?Nurkeeva P.?I.?Urkimbaeva K.?Park 《Colloid and polymer science》2004,282(10):1111-1117
Amphiphilic hydrogels of copolymers of the vinyl ether of ethylene glycol and vinyl isobutyl ether were synthesized by -radiation-induced free radical polymerization. Hydrogels with certain copolymer compositions showed thermo-sensitive behavior in aqueous solutions. The swelling behavior of the hydrogels in cetylpyridinium bromide aqueous solution was studied. Increased swelling of the hydrogels was observed in the surfactant solutions. The increased swelling was more prominent for the hydrogels with a higher content of hydrophobic moiety in the copolymer composition, and with higher surfactant concentration. The reason for this phenomenon is discussed. Treatment of some hydrogels in the surfactant solutions resulted in higher swelling ability in distilled water with distinct thermo-induced contraction over a narrow temperature interval. 相似文献
3.
The properties of passive Q-switched short-cavity dye lasers (SCDL) and passive Q-switched distributed-feedback dye lasers (DFDL) are investigated theoretically by using rate-equation models. The calculations, in agreement with experimental results, predict a significant decrease of the pulse energy fluctuation and the pulse duration of both the SCDL and DFDL, when passive Q-switching is used. 相似文献
4.
V. V. Khutoryanskiy Z. S. Nurkeeva G. A. Mun A. D. Sergaziyev S. Kadlubowski N. A. Fefelova T. Baizhumanova J. M. Rosiak 《Journal of Polymer Science.Polymer Physics》2004,42(3):515-522
Water‐soluble temperature‐responsive polyelectrolytes and hydrogels have been synthesized by γ‐radiation copolymerization of [2‐(methacryloyloxy)‐ethyl]trimethylammonium chloride with N‐isopropylacrylamide. Complex formation of soluble copolymers with potassium hexacyanoferrates (II, III) was studied in aqueous solutions. It was shown that, depending on the concentration and temperature, the formation of soluble or insoluble polycomplexes is observed. The hydrogels show good ability to absorb potassium hexacyanoferrates (II, III) from aqueous solutions. Sorption ability of hydrogels depends on the content of cationic monomer in copolymer and the nature of coordination ion. © 2003 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys 42: 515–522, 2004 相似文献
5.
Grigoriy A. Mun Vitaliy V. Khutoryanskiy Zauresh S. Nurkeeva Perizat I. Urkimbaeva Daulet Zhunuspaev 《Journal of Polymer Science.Polymer Physics》2004,42(14):2625-2632
Amphiphilic random copolymers based on vinyl ether of ethylene glycol and vinyl butyl ether as well as their polycomplexes with poly(acrylic acid) were studied as polymeric reagents for the stabilization of water/n‐hexane emulsions. The emulsion stability strongly depended on the content of vinyl butyl ether in the copolymers as well as their concentration in solution. The more hydrophobic copolymers stabilized emulsions more efficiently. An increase in the temperature and the addition of inorganic salts reduced the emulsion lifetime. The formation of interpolymer complexes between the copolymers and poly(acrylic acid) significantly influenced the stability of the emulsions. © 2004 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys 42: 2625–2632, 2004 相似文献
6.
We study the functionb(n, d), the maximal number of atoms defined byn d-dimensional boxes, i.e. parallelopipeds in thed-dimensional Euclidean space with sides parallel to the coordinate axes.
We characterize extremal interval families definingb(n, 1)=2n-1 atoms and we show thatb(n, 2)=2n
2-6n+7.
We prove that for everyd,
exists and
.
Moreover, we obtainb*(3)=8/9. 相似文献
7.
Vitaliy V. Khutoryanskiy Zauresh S. Nurkeeva Aibek D. Sergaziyev Janusz M. Rosiak 《European Polymer Journal》2003,39(4):761-766
The complex formation of poly-2-[(methacryloyloxy)-ethyl]trimethylammonium chloride (PMADQUAT) with poly(acrylic acid) (PAA) of different molecular weights has been studied in aqueous solutions by potentiometric, viscometric, turbidimetric and FTIR spectroscopic methods. The formation of insoluble non-stoichiometric polyelectrolyte complexes has been shown. The stability of polyelectrolyte complexes in solutions of different pH and ionic strength has been evaluated. The formation of polyelectrolyte complexes between hydrogels of PMADQUAT and linear PAA of different molecular weights has been studied. It was shown that the molecular weight of PAA considerably affects the kinetics of interaction as well as the final state of gel-polymer complex. 相似文献
8.
Grigoriy A. Mun Zauresh S. Nurkeeva Vitaliy V. Khutoryanskiy Aibek D. Sergaziyev 《Colloid and polymer science》2002,280(3):282-289
The complex formation reactions of poly(vinyl ether of diethylene glycol) as well as vinyl ether of diethylene glycol–vinyl
butyl ether copolymers with poly(acrylic acid) have been studied in aqueous and alcohol solutions. The formation of interpolymer
complexes which were stabilized by hydrogen bonds was shown. The effects of molecular weight of poly(acrylic acid) and the
nature of the nonionic polymer on the composition and stability of interpolymer complexes were clarified. The critical pH
values of complexation were determined for different systems with various molecular weights and hydrophobic–hydrophilic balances.
The stability of the interpolymer complexes formed in aqueous and alcohol solutions with respect to dimethylformamide addition
was evaluated. The role of hydrophobic interactions and the presence of active groups on stability of the interpolymer complexes
is discussed.
Received: 23 July 2001 Accepted: 27 September 2001 相似文献
9.
本文研究了在-170℃到+20℃温度范围内,Sb-Cs光阶极的光效应对温度的依赖关系。在极限波长附近,当温度下降时,发现灵敏度单纯地下降。在短波的地方,灵敏度在一个宽的温度范围内与温度无关;只有到极低温度时,灵敏度才很快下降。 相似文献
10.