摘要:

AbstractThe syntheses of 3‐acryloyloxyalkyl‐ and 3‐acryloyloxyaryl‐2‐phenyl‐4‐thiazolidones (3a–c) from the corresponding hydroxyl derivatives2a–cand acrylic acid chloride are described. These monomers were homopolymerized and copolymerized withN‐vinyl‐2‐pyrrolidone by radical initiation. The resulting water soluble copolymers were tested in animals for radioprotective activity and pro

ISSN:0025-116X    

DOI:10.1002/macp.1977.021780501

出版商:Hüthig&Wepf Verlag    

年代:1977

数据来源: WILEY

摘要:

AbstractThe structures of two homologous series of oligo[(2‐hydroxy‐1,3‐phenylene)methylene]s completely esterified with methacrylic acid, were spectroscopically analysed. The molar decadal absorption coefficients of ultraviolet absorption maxima of the two homologous series confirm Hunter's relation. The vinylidene, ester, and substitution bands of the infrared spectra as well as the mass spectra agree with the accepted structures. The1H NMR spectra permit to differentiate between exterior and interior groups of the mole

ISSN:0025-116X    

DOI:10.1002/macp.1977.021780502

出版商:Hüthig&Wepf Verlag    

年代:1977

数据来源: WILEY

摘要:

AbstractThe general conditions are described for the synthesis of ω‐hydroperoxy polymers by reaction of oxygen with CLi bonds of anionic living polymers. Secondary reactions as interchain coupling and the formation of alcohols are also discussed. In order to obtain a quantitative hydroperoxydation the following experimental parameters must be observed: (a) slow addition of the living solution to a polar solvent saturated by oxygen; (b) low concentration of living ends; (c) bulky terminal units; (d) lowest possible tempera

ISSN:0025-116X    

DOI:10.1002/macp.1977.021780503

出版商:Hüthig&Wepf Verlag    

年代:1977

数据来源: WILEY

摘要:

AbstractTo clarify the initiation and propagation mechanisms of the polymerization ofN‐vinylcarbazole (1) initiated by benzoyl peroxide (2), the spin trapping technique using 2‐methyl‐2‐nitrosopropane (5) was applied. From the ESR spectrum observed from this system, the 1‐(N‐carbazolyl)‐2‐benzoyloxyethyl radical (6a) was found to be trapped as its nitroxyl radical6b, which was confirmed by a comparison with similar nitroxyl radicals (7band8b) derived from the systems, di‐tert‐butyl peroxalate/1/5and2/N‐ethylcarbazole/5, respectively. Therefore, it was concluded that the1/2system produces easily a primary propagating radical of1viz.6a. Further, the monomer1was found to show a remarkable accelerating effect on the radical decomposition of2. From the copolymerization of1with styrene initiated by2, it was concluded that6apropagates by ordinary successive ß

ISSN:0025-116X    

DOI:10.1002/macp.1977.021780504

出版商:Hüthig&Wepf Verlag    

年代:1977

数据来源: WILEY

摘要:

AbstractThe polymerization of methyl methacrylate (MMA) with 1,2,3,10a‐tetrahydrophenanthrene‐1,2‐dicarboxylic anhydride (TH) (10), which is a stable Diels‐Alder adduct of α‐vinylnaphthalene and maleic anhydride, was investigated by kinetic and spin trapping methods. TH could induce radical polymerizations of MMA and methyl acrylate with a considerably high rate, and the rate of polymerization (Rp) of MMA was found to follow the equation:Rp=k[TH]0,3[MMA]1,6. The overall activation energy and the chain transfer constant to TH for this polymerization were determined to be 47,7 kJ/mol and 0,52, respectively. From these results, an initiation mechanism involving a hydrogen‐transfer from TH to MMA was proposed, which is similar toMayo's initiation mechanism for the thermal polymerization of styrene. To confirm this mechanism, the spin trapping technique was applied. The results obtained regarding the trapping of the initiating radicals supported this hydrogen‐transfer initia

ISSN:0025-116X    

DOI:10.1002/macp.1977.021780505

出版商:Hüthig&Wepf Verlag    

年代:1977

数据来源: WILEY

摘要:

AbstractLysine, as cupric complex, was fixed by its ε‐NH2end group onto pentamethylene or 3‐oxapentamethylene dichloroformates, and to sebacoyl dichloride. Copper elimination yields dicarbamates and diamides which can be used as prepolymers or as crosslinking ag

ISSN:0025-116X    

DOI:10.1002/macp.1977.021780506

出版商:Hüthig&Wepf Verlag    

年代:1977

数据来源: WILEY

摘要:

AbstractCarbon dioxide was copolymerized with methyloxirane and 7‐oxabicyclo[4.1.0]heptane using triethylaluminium as a catalyst component. Factors to control the copolymer composition were sought on the basis of an assumed copolymerization mechanism. Compared to nonpolar solvents, ethereal solvents were found to increase the carbon dioxide content in the copolymer obtained by the triethylaluminium/water system, giving a fraction with almost alternating sequence. The addition of a Lewis base, especially treiphenylphosphine, to triethylaluminium was also useful to get copolymers of high carbon dioxide content. The coincidence of these results with the expectation from the assumed copolymerization scheme clearly indicates that the copolymerization proceeds through a coordinated anionic mechanis

ISSN:0025-116X    

DOI:10.1002/macp.1977.021780507

出版商:Hüthig&Wepf Verlag    

年代:1977

数据来源: WILEY

摘要:

AbstractThe kinetics of the production of ethylene during the radiation induced autoxidation of poly(oxytetramethylene) were determined in chloroform solution at 25°C. It was found that the primary oxidative degradation of the polymer generating ethylene is part of a chain reaction process

ISSN:0025-116X    

DOI:10.1002/macp.1977.021780508

出版商:Hüthig&Wepf Verlag    

年代:1977

数据来源: WILEY

摘要:

AbstractThe kinetics of the production of random chain scissions by oxidative degradation of poly(oxytetramethylene) was determined during the radiation‐induced autoxidation of solutions of the polymer in chloroform at 25°C. Ethylene oxide resulting from autoxidation of ethylene produced by unimolecular decomposition of alkoxy‐1 alkylperoxy radicals partly inhibits the chain scission. This property allowed the characterization of the existence of a second primary mechanism of oxidative degradation of the polymer as non‐terminating bimolecular reaction of these peroxy radicals followed by a ß‐scission of the produced alkoxy

ISSN:0025-116X    

DOI:10.1002/macp.1977.021780509

出版商:Hüthig&Wepf Verlag    

年代:1977

数据来源: WILEY

摘要:

AbstractResults from previous publications of the series are interpreted and discussed in terms of a reaction scheme. Probabilities of the different non‐terminating reactions of α‐alkoxyalkylperoxy radicals during the autoxidation of solutions of poly(oxytetramethylene) 10−2g cm−3≤c≤ 6.10−2g cm−3were determined as follows: for the H atom abstraction = 0,2–0,4, for the monomolecular decomposition (reference) = 1, and for the non‐terminating bimolec

ISSN:0025-116X    

DOI:10.1002/macp.1977.021780510

出版商:Hüthig&Wepf Verlag    

年代:1977

数据来源: WILEY