摘要:

AbstractPolymere (Polyazine), die das reversible, bivalente Redoxsystem der 2,2′‐Azine aromatischer Heterocyclen enthalten, wurden aus bifunktionellen Salzen und Hydrazin dargestellt. Aus diesen Salzen und Hydrazonen wurden Bisazine als Modellverbindungen für die Polyazine erhalten. Durch Oxidation wurden Poly‐ und Bi‐Radikale dargestellt, die durch ihre ESR‐Spektren und die elektrische Leitfähigkeit charakterisiert wurden. Die Bisazine wurden polarographisch

ISSN:0025-116X    

DOI:10.1002/macp.1973.021720101

出版商:Hüthig&Wepf Verlag    

年代:1973

数据来源: WILEY

摘要:

Abstract5‐Chloro‐1‐(2′,3′‐dihydroxypropyl)‐uracil (1a), 9‐(2′,3′‐dihydroxypropyl)adenine‐1‐oxide (7), 9‐ and 3‐(2′,3′‐dihydroxypropyl)‐6‐methylthiopurine (4and5) were synthesized. Condensation polymerization of these compounds and other nucleoside analogues with phenoxy‐phosphoryl dichloride or dicarboxylic acids were carried out. All obtained oligomers9and11are very soluble in water and were found to have rel. mol. masses between 800 and 1300 accordin

ISSN:0025-116X    

DOI:10.1002/macp.1973.021720102

出版商:Hüthig&Wepf Verlag    

年代:1973

数据来源: WILEY

摘要:

AbstractDie Darstellung reaktiver Ester der Acryl‐, Methacryl‐ undN‐Vinylcarbaminsäure wird beschrieben. Die Verbindungen sind im Gegensatz zu anderen reaktiven Säurederivaten wie Säurechloriden, ‐anhydriden und Isocyanaten kristalline Monomere, die gut zu handhaben sind. Sie lassen sich leicht zu unvernetzten, löslichen Polymeren homo‐ und copolymerisieren. Die Copolymerisationsparameter wurden bestimmt. Entsprechend wie die aus der Peptidchemie bekannten reaktiven Ester reagieren sie in monomerer wie in polymerer Form bei niedriger Temperatur selektiv und schonend mit Nucleophilen in guten Ausbeuten, z. B. mit Aminen in wäßriger Lösung. Dies eröffnet die Möglichkeit zur nebenreaktionsfreien Bindung von Ph

ISSN:0025-116X    

DOI:10.1002/macp.1973.021720103

出版商:Hüthig&Wepf Verlag    

年代:1973

数据来源: WILEY

摘要:

AbstractAtaktisches Poly(2‐pyridyläthylen) [Poly(2‐vinylpyridin)] bildet mit Übergangsmetallverbindungen in Äthanol die folgenden Komplexe:[Mt(II)L2(C7H7N)2]n(1b, 1c), [MtJ2(C7H7N)3]n(2b, 2c), [NiJ2(C7H7N)4]n(3b), [FeCl2(C7H7N)2]n(1a), [CoCl2(C7H7N)3]n(2a) und [FeCl3(C7H7N)2]n(4), Mt = Co, Ni. L = Acetylacetonat. Das Koordinationsverhalten des Poly(2‐pyridyläthylens) und die IR‐Spektren werden

ISSN:0025-116X    

DOI:10.1002/macp.1973.021720104

出版商:Hüthig&Wepf Verlag    

年代:1973

数据来源: WILEY

摘要:

AbstractEinwirkung von Licht und Sauerstoff bei Raumtemperatur auf Polyurethane, die aus aromatischen Diisocyanaten und Diolen hergestellt wurden, führt zur Bildung von primären aromatischen Amino‐ und Hydroperoxy‐Gruppen. Oxidation der NH2‐Gruppen und Radikalreaktionen beim Zerfall der HOO‐Gruppen führen zur Verfärbung des Hochpolymeren. Die Bildung der NH2‐Gruppen und HOO‐Gruppen kann durch die Qualität der Ausgangs‐verbindungen, Reaktionsführung und geeignete Zusätze eingeschränkt werden. Diese Gruppen lassen sich durch Alkylierungsmittel bzw. Trioxo‐s‐triazin (Isocyanurat) abfangen. Polyurethane, die aus aliphatischen Diisocyanaten hergestellt wurden, unterlieg

ISSN:0025-116X    

DOI:10.1002/macp.1973.021720105

出版商:Hüthig&Wepf Verlag    

年代:1973

数据来源: WILEY

摘要:

AbstractThe ability of the system bis[(—)‐ephedrine]copper(II) chelate (Cueph)/carbon tetrachloride/pyridine (Py) to initiate the styrene polymerization was studied. In the region near to an equal mole ratio [CCl4] : [Py]the rate of polymerization depends linearly on the concentration of pyridine. At a mole ratio [CCl4]<[Py] an inhibition period is observed which is inversely dependent on the concentration of CCl4. The rate of polymerization decreases with increasing inhibition period. On the basis of spectrophotometric investigations in the UV region the formation of an adduct of Cueph with Py is to be assumed. The effect of this adduct on the course of the styrene polymerization initiated by the system Cueph/CCl4/Py is discus

ISSN:0025-116X    

DOI:10.1002/macp.1973.021720106

出版商:Hüthig&Wepf Verlag    

年代:1973

数据来源: WILEY

摘要:

AbstractCationic copolymerizations of furfural were carried out with several vinyl monomers. No copolymers were obtained with some hydrocarbon comonomers. At low temperatures furfural copolymerized with vinyl ethers selectively through the aldehyde group. On the other hand, deeply‐colored copolymers of complex structures were formed at higher temperatures (ca.0°C). Three typical vinyl ethers (p‐tolyl vinyl ether, dihydropyran, and divinyl ether) were selected as comonomers, and their copolymerization behaviour studied in detail. The monomer reactivity ratios for furfural (M1) andp‐tolyl vinyl ether (M2) werer1= 0,15 ± 0,15,r2= 0,25 ± 0,05. The furfural (FF) contents were fairly independent of the monomer feeds when dihydropyran (DHP) and divinyl ether (DVE) were used as comonomers: 37–47% for FF‐DHP copolymers and 40–50% for FF‐DVE copolymers. More than half of the second vinyl groups were consumed in the FF‐DVE copolymers indicating the formation of 1,3‐dioxane rings as in the case of benzald

ISSN:0025-116X    

DOI:10.1002/macp.1973.021720107

出版商:Hüthig&Wepf Verlag    

年代:1973

数据来源: WILEY

摘要:

AbstractA mixture of 2,3‐epoxypropyl ethyl maleate and fumarate (4) was obtained from ethyl potassium maleate and 1‐chloro‐2,3‐epoxy propane.Copolymerization of4with styrene was carried out and the monomer reactivity ratios were found to ber1= 0,30 andr2= 0,05 (M1: styrene,M2: ester4).Qandevalues were found to be 0,55 and 1,28, respectively. Copolymerizations of4with ethylene were performed to improve the chemical reactivity of polyethylene, and the reactivity was studied by means of a homogeneous reaction with dibutylamine. The observed kinetic data may be divided into two parts:ko(non‐catalytic rate constant) = 1,75 · 10−5dm3mol−1s−1,kc(product‐induced catalytic rate constant) = 2,25 · 102dm6mol

ISSN:0025-116X    

DOI:10.1002/macp.1973.021720108

出版商:Hüthig&Wepf Verlag    

年代:1973

数据来源: WILEY

摘要:

AbstractThe complex formation in chloroform solution of poly(N‐vinylcarbazole) andN‐ethylcarbazole with the electron acceptors tetracyanoethylene, tetrachloro‐p‐benzoquinone (chloranil) and 1,3,5‐trinitrobenzene was studied. The stability of the donor‐acceptor complexes with mole ratios of 1:1 was determined spectrophotometrically by a modified method of successive dilution.A mathematical method was developed for a simultaneous determination of the extinction coefficient and of the stability constant by conversion of a quadratic relation into a linear form and by application of the least square method. The experimental results were treated by a computer program.The values obtained by this method for the extinction coefficients and for the stability constants ofN‐ethyl carbazole complexes are higher than those of poly(N‐vinylcarbazole) complexes. The change of the electron affinity of the acceptors does not affect considerably the stability constants o

ISSN:0025-116X    

DOI:10.1002/macp.1973.021720109

出版商:Hüthig&Wepf Verlag    

年代:1973

数据来源: WILEY

摘要:

AbstractDifferent poly(vinyl ketone)sin which R is an alkyl or phenyl radical were reduced by lithium aluminum hydride or by potassium tetrahydroborate.The influences of the substituent R, of the nature and quantity of the hydride, and of the duration of the reaction on the degree of reduction are described. Amine derivatives of the polyalcohols are prepared.

ISSN:0025-116X    

DOI:10.1002/macp.1973.021720110

出版商:Hüthig&Wepf Verlag    

年代:1973

数据来源: WILEY