摘要:

AbstractAus aromatischen Polyamiden und Polyamid‐Hydraziden lassen sich asymmetrische Umkehrosmose‐Membranen herstellen. Polyamid‐Membranen weisen bei Druckfitration bei 100 bar Kochsalz zu mehr als 99% zurück, während Polyamid‐Hydrazid Membranen unter gleichen Bedingungen, bei quantitativem Rückhaltevermögen für MgSO4, Kochsalz nur zu 90 bis 98% zurückweisen. Herstellung und Eigenschaften dieser Membranen werde

ISSN:0003-3146    

DOI:10.1002/apmc.1978.050730101

出版商:Hüthig&Wepf Verlag    

年代:1978

数据来源: WILEY

摘要:

AbstractThe reaction between acroleindiethylacetal (3.3‐diethoxypropene) and free radicals and the behaviour of this acetal in the free radical copolymerization with unsaturated monomers has been investigated. The decomposition of benzoyl peroxide and tert.‐butyl peroxide in acroleindiethylacetal has been studied in the liquid phase. On the basis of the obtained products a mechanism is proposed which involves the abstraction of a hydrogen atom by a primary radical from a carbon atom which is adjacent to oxygen. We also tried to copolymerize the acetal with several conventional comonomers but copolymers were only obtained when acrylonitrile and maleic anhydride were used. The remarkably uniform composition of the copolymers from the acetal and maleic anhydride is explained through a donor‐acceptor complex between the two mon

ISSN:0003-3146    

DOI:10.1002/apmc.1978.050730102

出版商:Hüthig&Wepf Verlag    

年代:1978

数据来源: WILEY

摘要:

AbstractThe paper illustrates the graft emulsion polymerization of methylmethacrylate onto polybutadiene in two steps. In the first butadiene is polymerized using two radical initiators (AIBN and (NH4)2S2O8), whose ratio does not influence the relative amount of 1,2‐, 1,4‐trans and 1,4‐cis structures. The second step uses AIBN only: the grafting yield is very high. Grafting mechanism is discussed. The grafted polymer has good mechanical properties and its blends with PVC present very high impact strength. The mechanical properties are discussed. A statistical copolymer of butadiene and methylmethacrylate was prepared and compared with the grafted polymer. The copolymer is also a very good additive for PVC to elevate its impact str

ISSN:0003-3146    

DOI:10.1002/apmc.1978.050730103

出版商:Hüthig&Wepf Verlag    

年代:1978

数据来源: WILEY

摘要:

AbstractA cation exchange resin was synthesized from the condensation product of poly(iso‐butyl vinyl ether) and furfural by treating it with concentration sulphuric acid. The resin produced was characterized by measuring its total and salt splitting capacities, and by studying its thermal characteristics and behaviour to pH metric titration. The latter suggests the resin to be a weak one possibly containing COOH groups, which result from the oxidation of the furfural aldehyde group by sulphuric a

ISSN:0003-3146    

DOI:10.1002/apmc.1978.050730104

出版商:Hüthig&Wepf Verlag    

年代:1978

数据来源: WILEY

摘要:

AbstractLe film de polypropylène beétiré est un diélectrique de plus en plus utilisé dans la fabrication des condensateurs. L'article traite de son imprégnation par des composés polaires en vue d'améliorer ses propriétés dié

ISSN:0003-3146    

DOI:10.1002/apmc.1978.050730105

出版商:Hüthig&Wepf Verlag    

年代:1978

数据来源: WILEY

摘要:

AbstractAn PA‐6‐ und ‐66‐Filamentgarnen konnten Spannungsrisse definiert erzeugt werden. In Abhängigkeit von der bei der Behandlung im Spannungsrißkorrosion fördernden Bad wirkenden feinheitsbezogenen Fadenzugkraft wurden dabei unterschiedliche Rißlagen bezüglich der Faserachese festgestellt. für die Begründung der Rißlage wird auf die Kern‐Mantel‐Struktur der Fasern zurückgegriffen und unter Berücksichtigung der inneren Quellspannung und der äußeren Zugspannung eine Kräftebilanz für den Fasermantel erstellt. Die abgeleiten Beziehungen gestatten auch eine Abschätzung der bei einer turgo‐mechanischen Behandlung der Faser

ISSN:0003-3146    

DOI:10.1002/apmc.1978.050730106

出版商:Hüthig&Wepf Verlag    

年代:1978

数据来源: WILEY

摘要:

AbstractAcryloylation and methacryloylation of 1‐aryl‐2,2,2‐trichloroethanol were used in the preparation of (1‐aryl‐2,2,2‐trichloroethyl) acrylates and methacrylates, respectively, in which the aryl groups were represented by the phenyl, 4‐chlorophenyl, 4‐bromophenyl, and 2,5‐dichlorophenyl group. By radical polymerization using 2,2′‐azobis(isobutyronitrile), the esters were polymerized to hard transparent blocks or in benzene solution. The density of homopolymers, the temperature of their initial decomposition, the glass temperature and the limiting oxygen index of their continuous flaming combu

ISSN:0003-3146    

DOI:10.1002/apmc.1978.050730107

出版商:Hüthig&Wepf Verlag    

年代:1978

数据来源: WILEY

摘要:

AbstractA number of diacylperoxides, peroxydicarbonates, peresters and dialkylperoxides with various substituents were chosen to investigate their homolytic decomposition under pressures of up to 3000 bar and high temperatures of up to 200°C, discontinuously in steel autoclaves, in an optical high pressure cell and in flow processes. The measurements, carried out in isododecane as solvent with a peroxide concentration of 1% by weight show that pressure has a strong influence on the decomposition: the half‐life time at 3000 bar is twice that at normal pressure. The pressure dependence, which varies according to the structure of the peroxide and the decomposition mechanism, is interpreted by means of the activation volumes. On the basis of the results, recommendations are made on the choice of peroxides suitable as polymerization initiators for application at high pressures and temperatur

ISSN:0003-3146    

DOI:10.1002/apmc.1978.050730108

出版商:Hüthig&Wepf Verlag    

年代:1978

数据来源: WILEY

摘要:

AbstractAls Modell zur Ausarbeitung einer chemischen Methode zur Netzwerkanalyse von gehärteten Epoxidharzen eignet sich das lineare Polyadditionsprodukt aus Hexahydrophthalsäurediglycidylester und Piperazin. Durch alkalische Esterhydrolyse des Polymeren erhält man Spaltprodukte, die qualitativ sowie quantitativ bestimmt werden können. Der Einfluß des Mischungsverhältnisses der Readtionspartner sowie des Zusatzes von verschiedenen Beschleunigern wird disku

ISSN:0003-3146    

DOI:10.1002/apmc.1978.050730109

出版商:Hüthig&Wepf Verlag    

年代:1978

数据来源: WILEY

摘要:

AbstractBei der Reduktion von Oligoamiden durch Raney‐Nickel in alkalischem Milieu werden Oligoamine erhalten, welche Amino‐und Hydroxyl‐Endgruppen enth

ISSN:0003-3146    

DOI:10.1002/apmc.1978.050730110

出版商:Hüthig&Wepf Verlag    

年代:1978

数据来源: WILEY