Some features of fibre preparation from a copolymer of acrylonitrile with 5-vinyl-2-methylpyridine

Conclusions Increasing the content of ionogenic grups in a copolymer of acrylonitrile with 5-vinyl-2-methylpyridine leads to a change in intermolecular interaction is solutions of the polymer, and this exerts an effect on their rheological properties.The parameters of the process of spinning and fibre strengthening are determined by the composition of the copolymer, a change in fibre properties being observed at a content of active groups in the copolymer which is greater than 40% by wt.Translated from Khimicheskie Volokna, No. 3, pp. 17–19, May–June, 1986.     

Synthesis of a copolymer of acrylonitrile with sodium methallylsulfonate in dimethyl sulfoxide and the preparation of a chemisorptive fibre based on it

Conclusions Conditions have been developed for the synthesis of a copolymer of acrylonitrile and sodium methallylsulfonate in dimethyl sulfoxide containing up to 2–1/2% water by wt., using a redox initiating system.Fibres spun from the indicated copolymer have satisfactory physico-mechanical properties, and their static exchange capacity is as much as 1.1 meq/g.Translated from Khimicheskie Volokna, No. 4, pp. 16–18, July–August, 1990.     

Relaxation properties of a chemisorption fiber based on the copolymer of acrylonitrile and 2-methyl-5-vinylpyridine

The relaxation properties of chemisorption fibers based on copolymers of acrylonitrile and 2-methyl-5-vinylpyridine synthesized in aqueous medium and in dimethyl sulfoxide were investigated. It was shown that the conditions of synthesis of the copolymers affect the relaxation properties of the fibers. It was hypothesized that the change in the relaxation properties is due to the composite composition of the copolymers, which is determined by the copolymerization constants.All-Russian Scientific-Research Institute of Polymer Fibers, Mytishchi. Translated from Khimicheskie Volokna, No. 4, pp. 36–39, July–August, 1992.     

Hydrazidation of fibres based on acrylonitrile copolymers

Conclusions A scheme has been suggested for the catalytic effect of carboxyl groups on the conversion of -CN groups in acrylonitrile copolymers in modification with hydrazine hydrate.It has been shown that the hydrazidation of acrylonitrile copolymers is accompanied by the appearance of stable free radicals, the rate of formation of these correlating with the rate of nitrile group conversion.The suggestion has been made that a three-dimensional chemical network which is formed during hydrazidation aids in stabilizing the radicals.A chemisorptive fibre with anion-exchange groups has been prepared, which has satisfactory physico-mechanical and sorptive properties.Translated from Khimicheskie Volokna, No. 4, pp. 10–12, July–August, 1988.     

2-氯-5-甲基吡啶的合成

主要介绍了以2-氨基-5-甲基吡啶为原料,经重氮化合成2-氯-5-甲基吡啶的过程及影响因素.     

2-氨基-5-甲基吡啶重氮化合成2-氯-5-甲基吡啶的方法研究

以2-氨基-5-甲基吡啶为原料,经重氮化、氯代热解反应制得了2-氯-5-甲基吡啶,研究了浓盐酸用量、亚硝酸钠用量、氯代温度、氯代时间、不同氯代剂对2-氯-5-甲基吡啶收率的影响。优化工艺条件为:氯化亚铜为催化剂,n(2-氨基-5-甲基吡啶)∶n(盐酸)=1∶3、n(2-氨基-5-甲基吡啶)∶n(亚硝酸钠)=1∶1.1、重氮化温度为0～5℃,氯代温度45℃、氯代时间8 h、稀盐酸为氯代剂,优化条件下产品的收率为74.76%。     

Addition polymerization of norbornene, 5-vinyl-2-norbornene and 2-methoxycarbonyl-5-norbornene with a catalyst based on a palladium(0) precursor complex

Pd(dibenzylideneacetone)₂, when activated in situ with 1 equiv of [CPh₃][B(C₆F₅)₄] in the presence of 1 equiv of P(C₆H₁₁)₃, efficiently catalyzed the addition polymerization and copolymerization of norbornene and its derivatives. Homopolymerization of 5-vinyl-2-norbornene took place regio-selectively with the endo-cyclic double bond to give high-molecular weight polymers, while the exocyclic double bond remained intact so that the resulting polymer had pendent vinyl groups along the polymer chain. In the polymerization of a mixture of the endo-/exo- isomers of 2-methoxycarbonyl-5-norbornene, the endo-isomer was consumed prior to consumption of the exo-isomer, contrary to the well-known tendency in Pd(II)-based catalyst systems. Another notable feature of the present catalytic system was the strong dependency of the molecular weight on the reaction temperature, which was studied in detail for the copolymerization of 2-methoxycarbonyl-5-norbornene with norbornene: we could control the molecular weight without the use of a chain transfer agent. The extracted oligomeric fraction of poly(norbornene) showed the presence of a terminal CC double bond as well as a C₆F₅ unit that was bound to the first norbornane unit in the polymer chain.     

Some peculiarities of the copolymer precipitation in spinning a strongly-acid chemisorptive fibre

Conclusions The existence of polyelectrolyte swelling (self-elongation of the fibre on change of medium) has been established in strongly acid undrawn gel-fibre.It has been shown that cementing of the strongly-acid fibre after drying, when the fibre has been wet-spun into aqueous-organic baths, is caused by the presence of solvent which is strongly retained on the fibre.A possible mechanism for the retention of solvent by the strongly-acid gel-fibre has been advanced.Translated from Khimicheskie Volokna, No. 4, pp. 32–34, July–August, 1987.     

Structural features and properties of fibres based on mixtures of an ethylene-vinylacetate copolymer with a copolyamide

Conclusions By x-ray analysis, we have confirmed the previously expressed hypothesis of a forced deformation of SÉVA on flow of an SÉVA—SPA mixture as a result of specific interaction of the components at the interface: the degree of orientation of the SÉVA macromolecules in the microfibres is higher than in a monofilament from the starting polymer.It has been shown that ultrathin SÉVA fibres are characterized by a porosity, caused by micro- and macro-hollows, which causes a decrease in their strength as compared with the strength of ordinary SÉVA fibres.Kiev Technological Institute for Light Industry. Translated from Khimicheskie Volokna, No. 2, pp. 39–41, March–April, 1992.     

Spectrophotometric analysis of polymer mixtures based on a copolymer of acrylonitrile and a polyamido acid in dimethylacetamide

Conclusions An instrumental method of analysis of the composition and concentration of polymer compositions from mixtures of a copolymer based on acrylonitrile and a polyamido acid in dimethyl acetamide from their IR spectra has been proposed.The rapidity and selectivity of the method, and the possibility of carrying out the analysis directly on the object without use of auxiliary operations, made it possible to recommend it for serial analyses.Translated from Khimicheskie Volokna, No. 6, pp. 55–56, November–December, 1986.     

2-氯-5-甲基吡啶生产工艺改进

针对由3-甲基吡啶-N-氧化物与三氯氧磷反应生产2-氯-5-甲基吡啶过程中存在的收率偏低问题,通过添加助剂三氯化铝,使合成收率达到了68%.与原有工艺相比,合成收率提高了16%,有效地降低了生产成本,具有生产应用前景.     

3-甲基吡啶-N-氧化物深度氯化以提高产品收率

针对由3-甲基吡啶-N-氧化物与三氯氧磷生产2-氯-5-甲基吡啶过程存在的收率偏低问题,通过固体光气的深度氯化,使合成收率达到了76%,2-氯-5-甲基吡啶和2-氯-3-甲基吡啶合计总收率达95%,大幅度降低了生产成本。     

Fabrication of sorption-active fibres based on hydrated cellulose-polyglycidyl methacrylate graft copolymer

Interpolation equations describing the depth of polymer-analog transformations of a graft copolymer as a function of the conditions of conducting the process were obtained using mathematical methods of design of experiments. The optimum parameters of polymer-analog transformations of HC—PGMA graft copolymer under the effect of thiourea and potassium thiocyanate were determined. The sorption-active fibres obtained in the optimum conditions have a RDC of 2.0–4.5 mmole/g. Translated fromKhimicheskie Volokna, No. 6, pp. 41–43,November–December, 1998.     

Producing a fibre-forming copolymer of acrylonitrile with vinylene carbonate in homogeneous conditions

Conclusions 1. We have studied the copolymerization of AN with VC in homogeneous conditions. We calculated the copolymerization constants to be r_AN=14.9±0.1; r_VC=0.085±0.001.2. We selected conditions for producing fibre-forming copolymer, and obtained fibre with satisfactory mechanical indices.All-Union Scientific-Research Institute for Synthetic Fibres (VNIIV). Translated from Khimicheskie Volokna, No. 4, pp. 50–51, July–August, 1969.     

Copolymerization behavior of 2-vinyl-5-methyl furan

Summary The title monomer was copolymerized with methyl methacrylate, isobutyl methacrylate n-butyl acrylate. The results of the copolymerization experiments were analyzed using a nonlinear least squares error-invariables method in order to obtain reactivity ratios for each monomer pair. In all cases the 2-vinyl-5-methyl furan proved to be the more reactive monomer, although this monomer is not as reactive as some other vinyl heterocycles have proved to be in copolymerizations with these same or similar comonomers.