摘要:

AbstractPoly(oxysilane imide)s were prepared via Diels‐Alder (DA) intermolecular polymerization of bis(2‐furylmethyloxy)‐dimethyl silane (1) with different bis(maleimido)‐compounds (2a–h). The DA reaction was carried out in tetrahydrofuran as solvent as well as in bulk followed by dehydration (aromatization) of poly(tetrahydrophthalimido)‐intermidiates (3a–h) in the presence of acetic anhydride. All poly(oxysilane imide)s (4a–h) were characterized by elemental analyses, IR spectral studies, and thermogravimetry.1and2were polymerized (at 130 ± 10°C) by in‐situ Diels‐Alder intermolecular reaction into poly(oxysilane imide)s‐glass fibre composites (i.e. laminates) without evolution of by‐products. The prepared composites were characterized by chemical resistivity

ISSN:0003-3146    

DOI:10.1002/apmc.1992.051950101

出版商:Hüthig&Wepf Verlag    

年代:1992

数据来源: WILEY

摘要:

AbstractPhotoinitiated surface grafting of acrylic monomers has been carried out onto high strength polyethylene (HSPE) yarn by means of a continuous process. The grafting reaction is initiated by UV irradiation of the yarn after presoaking in an acetone solution of initiator and monomer. Four initiators, benzophenone (BP), 4‐chlorobenzophenone (4‐CBP), 2‐hydroxy‐2‐cyclohexylacetophenone (HHA), and 2,2‐dimethoxy‐2‐phenylacetophenone (DMPA), and two monomers, acrylic acid (AA) and acrylamide (AM), have been used. After short irradiation time (10 to 20 s) successful grafting is obtained, as shown by ESCA and IR‐ATR spectra, dye adsorpotion from aqueous solution, and measurements of adhesion of single filaments to epoxy resin. Grafting efficiency of 74% has been reached for AA as monomer (26% is homopolymer). The tensile strength and modulus of the HSPE yarn are retained in the grafting process. The degree of surface grafting is mainly a function of structure and concentration of monomer and photoinitiator in the presoaking solution and of the irradiation conditions used. Increasing irradiation time gives increasing amounts of grafted polymer up to a certain limiting value. The reactivities of the four initiators have been compared showing the highest grafting yields of AA with BP and of AM with 4‐CBP as photoinitiator. AA grafted HSPE yarn can be dyed to rather deep color by dipping in an aqueous solution of Crystal Violet. Increased dye absorption by a factor of up to seven has been measured for yarn grafted with AA to the maximum level obtained. The filaments of the grafted yarn show increased adhesion to epoxy resin by a factor of up to five compared with the

ISSN:0003-3146    

DOI:10.1002/apmc.1992.051950102

出版商:Hüthig&Wepf Verlag    

年代:1992

数据来源: WILEY

摘要:

AbstractPoly‐α,β‐D, L‐aspartamides featuring carboxy‐functionalized side groups are synthesized by three different preparative routes: (i) aminolytic ring opening in polysuccinimide, (ii) N‐carboxymethylation of amine‐functionalized polyaspartamides, and (iii) nucleophilic addition of iminodiacetic acid to acryloylamino‐substituted poly‐aspartamides. The polymeric products, possessing inherent viscosities in the wide range of 5–30 ml g−1, are characterized microanalytically and spectroscopically. By virtue of the carboxylic acid side groups lending themselves to the reversible covalent bonding of suitably structured drug models, the polymers are designed to function as macromolecular carriers of chemotherapeutically active agents. Being perfectly soluble in aqueous media over a wide pH range, they fulfill a crucial precondition for carrier components in (parenterally administered) po

ISSN:0003-3146    

DOI:10.1002/apmc.1992.051950103

出版商:Hüthig&Wepf Verlag    

年代:1992

数据来源: WILEY

摘要:

AbstractSome materials, suitable for application in polymer‐surfactant flooding used in tertiary oil recovery (EOR), have been characterized by static and dynamic light scattering and studied in respect to their suitability in various model brines by measuring their rheological and dynamic‐rheological behaviour. Xanthan and polyacrylamides of different degree of hydrolysis have been used as polymers, an ethylene glycol sulfonate as surfactant.Correlations have been established between microscopic structural parameters (Hydrodynamic radius, radius of gyration, molar mass, shape of the polymers) and the macroscopic behaviour, such as viscosity and elasticity, being important rheological parameters for EOR application. Additional investigations on surface tension and long term viscosity study lead then to a judgement for the efficiency and long term stability of polymer‐surfactant slugs in various reservoirs of different sal

ISSN:0003-3146    

DOI:10.1002/apmc.1992.051950104

出版商:Hüthig&Wepf Verlag    

年代:1992

数据来源: WILEY

摘要:

AbstractEs wird über die Herstellung und Charakterisierung von dünnen Filmen aus Poly(p‐phenylen‐1, 3,4‐oxadiazolen) berichtet. Die aus H2SO4‐Lösungen präparierten Filme besitzen eine gute optische Transparenz und sind mechanisch stabil. Filme aus Michungen mit Polyamiden zeigen ein ähnliches Verhalten und sind aufgrund ihrer thermischen Eigenschaften für spezielle Anwendungen interessant. Bei faserverstärkten Filmen zeigen erste Untersuchungen, daß spezielle Grenzflächenbe

ISSN:0003-3146    

DOI:10.1002/apmc.1992.051950105

出版商:Hüthig&Wepf Verlag    

年代:1992

数据来源: WILEY

摘要:

AbstractPolymerization of β,β′‐(ethylenedithio)dipropionitrileIUPAC name: 4,7‐dithiadecane dinitrile.with formaldehyde in the presence of sulfuric acid was carried out in order to permit the synthesis of polymides containing thioether groups. The obtained poly(amide thioether)s were characterized; they coordinate mercury (II) with a high degree of sele

ISSN:0003-3146    

DOI:10.1002/apmc.1992.051950106

出版商:Hüthig&Wepf Verlag    

年代:1992

数据来源: WILEY

摘要:

AbstractCellulose‐g‐poly(glycidyl methacrylate) copolymer was reacted with aqueous solutions containing mixtures of both sodium sulfite and citric acid, in order to synthesize bifunctional cation exchangers containing both sulfonic and carboxylic acid groups. Factors affecting the reaction, such as percent neutralization of citric acid with sodium carbonate, time, temperature, liquor ratio, reagents‐to‐epoxide molar ratio, and monosodium salt of citric acid‐to‐epoxide molar ratio were studied. Reaction conditions were selected to prepare five kinds of cation exchangers of different sulfonic and carboxy contents. These exchangers were characterized by potentiometric titrations, durability tests, and water

ISSN:0003-3146    

DOI:10.1002/apmc.1992.051950107

出版商:Hüthig&Wepf Verlag    

年代:1992

数据来源: WILEY

摘要:

AbstractDie Verwendbarkeit der aus 2‐Furaldehyd erhaltenen Halogentriole 2,3‐Dichlor‐ und 2,3‐Dibrom‐1,4,7‐heptantriol als reaktive Flammschutzmittel für PUR‐Hartschäume wurde untersucht. Zur Modifikation der Schäume wurden diese Verbindungen allein und im synergistischen System mit Antimont

ISSN:0003-3146    

DOI:10.1002/apmc.1992.051950108

出版商:Hüthig&Wepf Verlag    

年代:1992

数据来源: WILEY

摘要:

AbstractRedox polymerization of methylmethacrylate (MMA) using Ce(IV) with poly(oxyethylene) having azo and hydroxy functions was carried out to yield methylmethacrylate‐ethylene glycol block copolymers with labile azo linkages in the main chain. These prepolymers were used to initiate the radical polymerization of styrene through the thermal decomposition of the azo group, resulting in the formation of multiblock copolymers. Successful blocking has been confirmed by fractional precipitation, a strong change in the molecular weight distribution and spectral measurement

ISSN:0003-3146    

DOI:10.1002/apmc.1992.051950109

出版商:Hüthig&Wepf Verlag    

年代:1992

数据来源: WILEY

摘要:

AbstractEpoxy resins derived from Bisphenol A have been modified with new diphenols containing imide moieties in order to improve their thermal properties. The diphenols have been synthesized from dianhydrides and aminophenols by condensation reactions. Diphenols as well as modified resins have been characterized by IR and NMR spectroscopy. The thermal characteristics were evaluated by DSC and TGA.

ISSN:0003-3146    

DOI:10.1002/apmc.1992.051950110

出版商:Hüthig&Wepf Verlag    

年代:1992

数据来源: WILEY