[en] Full text:The copolymerization reaction of ρ-(substituted) cyclopropyl styrene's with styrene has been studied. An influence of substituent's on reactivity of ρ-(substituted) cyclopropyl styrene's has been investigated. The copolymerization constant values and Q-e parameters of Alfrey-Praice scheme have been calculated. The parameters of microstructure of copolymers have been determined

[en] The preparation of wood-plastic combinations can be regarded as a special field of graft-copolymerization. It is therefore quite understandable why this idea was first introduced by graft-copolymerization specialists. On the basis of the theory and technique of radiation-induced graft- copolymerization, which has been greatly developed since 1950, wood-plastic combinations appeared simultaneously in the United States of America and in Europe. As is known, intensive American research on wood-plastic combinations is based on four patents by Kenaga from 1958, which were published in 1963. The worldwide interest in the matter was initiated, however, by Karpov's paper of 1960 based on Soviet patents from 1958 and 1960

[en] Published in summary form only

[en] The published data on the synthesis of C- and N-vinyltetrazoles and their chemical transformations (homo- and copolymerisation) involving the heterocycle and the vinyl group are systematised and generalised. The areas of possible application of these compounds are considered.

[en] Serum protein comprising specific binding proteins such as antibodies, B₁₂ intrinsic factor, thyroxin binding globulin and the like may be copolymerized with globulin constituents of serum by the action of ethylchloroformate to form readily packed insoluble precipitates which, following purification as by washing, are eminently suited for employment as competitive binding protein absorbents in radioassay procedures. 10 claims, no drawings

[en] A centrosymmetric polymer precursor, 4-(2,5-di(thiophen-2-yl)-1H-pyrrol-1-yl)butan-1-amine (TPBA), was synthesized via a Knorr–Paal reaction and its copolymer with EDOT was electrochemically synthesized and characterized. While P(TPBA) has only two colors in its oxidized and neutral states, its copolymer with EDOT has eight different colors. Electrochromic devices based on P(TPBA)/PEDOT and P(TPBA-co-EDOT)/PEDOT were constructed and characterized. The oxidized state of the device shows blue color whereas it shows purple for the reduced state. At moderate potentials the device has good transparency with green and gray colors. The maximum contrast and switching time of the multielectrochromic copolymer device were measured as 25% and 0.8 s at 575 nm. Copolymerization not only increases the polymer’s color scheme, but also improves its properties, such as redox stability and switching time. (paper)

[en] It was noticed during the tests conducted on the grafted jute (preceding paper) that water absorption in these samples decreases and resistance to certain micro-organisms increases. An investigation was carried out to determine whether the strength of jute on graft-copolymerization (under gamma radiation) would undergo any change. Variation in strength on 'grafting' in view of these improved properties would have a direct bearing on the commercial utility of jute fibre

[en] An advanced lithographic technology currently under investigation for integrated circuit fabrication having design rules of ≤ 0.20 μm is proximity x-ray lithography. High intensity x-rays produced using either a synchrotron storage ring or laser-produced plasma sources have been shown to meet the requirements for use in x-ray lithography. To offset the cost and space requirements of a synchrotron source, a pulsed laser point source x-ray stepper has been manufactured and is being evaluated at AT ampersand T. Numerous positive and negative tone resist formulations based on conventional and chemical amplification (CA) processes have been investigated. Resist performance criteria include resolving ≤ 0.20 μm line and space pairs in 0.40 μm thick films using an incident x-ray exposure dose of ≤ 20 mJ/cm². Single and multi-component CA resists consisting of 4-t-butoxycarbonyloxystyrene sulfone coplymers have been found to be leading candidates for positive acting x-ray resists. Addition of poly(2-methyl-1-pentene sulfone) to a novolac resin is shown to produce positive tone patterns when exposed to x-radiation. Submicron imaging in this resist is attainable but certain requirements such as having a high contrast x-ray mask are required. Negative CA resists are shown to produce high resolution patterns, but exhibit restricted process latitude when compared to conventional crosslinking negative resists. These resists however at present do not provide the resolution level needed in x-ray lithography. Future changes in the exposure wavelength, improvements in the delivery of the pulsed laser power of the x-ray point source should broaden the candidates of resists compatible with this advanced lithographic technology

[en] The contents are initiation of radical polymerization, photo-initiation, factors in free-radical polymerization, radiation-curable materials, cationic initiation. 4 tabs., 3 figs

[en] Radiation-induced copolymerization of N-vinylpyrrolidone with diethylaminoethyl methacrylate and its quaternary ammonium salt, N-(methacryloyloxyethyl)-N,N,N-triethylammonium iodide, in water was investigated. The structure and properties of the polymers were studied in relation to the conditions under which the process was carried out. Water-soluble polymers, of interest as modifiers of biologically active substances, were obtained. 6 refs., 2 figs