摘要:

AbstractNew macromers4, 8,and10,containing ester, alcohol, or acid functions, were prepared starting with vinyl chloride (CV) or vinylidene dichloride (CV2). The telomer1,resulting from CV2and CCI4was telomerized with allyl acetate and the product was transformed into the acrylate4by hydrolysis of the reaction product and subsequent esterification. Macromers8and10were prepared from CV by radical telomerization with thioglycolic acid(7)and 2‐mercaptoethanol(9),respectively. Reactive double bonds were introduced into these macromers by reaction with acrylic acid, Vinyl chloroformate, methacryloyl chloride, or2,3‐epoxypropyle methacrylate, leading to new macromers12, 13, 14,and15,respectiv

ISSN:0025-116X    

DOI:10.1002/macp.1983.021841201

出版商:Hüthig&Wepf Verlag    

年代:1983

数据来源: WILEY

摘要:

AbstractIn order to elucidate kinetics and mechanism of photoinitiation processes based on potassium trioxalatoferrate(III) (K3[Fe(cx)3])/ onium compounds/acrylamide (AA) interactions, photolysis and stationary photopolymerization were carried out. Diphenyliodonium chloride (Ph2I⊕Cl⊖) and triphenylsulfonium tetrafluoroborate (Ph3S⊕BF⊖4) were used as onium compounds. These compunds react with photolytically formed˙CO⊖2radicals by an electron transfer mechanism. The resulting phenyl radicals were detected by spin trapping with nitrosodurene. The quantum yield of the decomposition of onium salts, ϕIn, depends both on their reduction potentials and concentrations. Thus, an efficient redox reaction between˙CO⊖2radical and Ph3S⊕BF⊖4is impossible because the former reacts faster with the Fe(III) complex. The ratio between rate constants of these competitive reactions (onium compound/Fe(III)) are 0,1 (Ph2I⊕Cl⊖) and 4 · 10−4(Ph3S⊕BF⊖4). Only with the system K3[Fe(ox)3]/Ph2I⊕Cl⊖/AA a radically induced photopolymerization was observed. Both the rate and the quantum yield (ϕBr) depend on the Ph2I⊕Cl⊖concentration. A co

ISSN:0025-116X    

DOI:10.1002/macp.1983.021841202

出版商:Hüthig&Wepf Verlag    

年代:1983

数据来源: WILEY

摘要:

AbstractFormation of a supported titanium‐magnesium catalyst for propylene polymerization was studied using highly dispersed magnesium chloride (surface area ca. 100 m2/g). By means of X‐ray diffraction, chemical analysis, and measurement of the surface area it was found that: i) interaction of ethyl benzoate (EB) with MgCl2results in the formation of a compound EBEB·MgCl2(1:1 by mole); ii) milling of productsnEB · MgCl2(n<1) results in the decomposition of the lattice of the compound EB · MgCl2and in the decrease of the size of MgCl2crystallites; iii) treatment of the productnEB · MgCl2with titanium tetrachloride results in the removal of a part of EB in the form of an EB·TiCl4, complex from the support, the decomposition of the lattice of the compound EB·MgCi2an increase of the size of the MgCl2crystallites, and a sharp increase of the surface area; iv) a small amount of EB (EB/MgCl2= 0,1 to 0,2) considerably increases the isoptacticity of polypropylene. The high activity of catalysts prepared by milling is due to a higher surface area of these catalysts compared to unmille

ISSN:0025-116X    

DOI:10.1002/macp.1983.021841203

出版商:Hüthig&Wepf Verlag    

年代:1983

数据来源: WILEY

摘要:

AbstractPolymer‐supported macrocyclic polythioethers(7a, b,and8)were prepared from chloromethylated polystyrene resins(6)and 14‐ or 20‐membered a hydroxyl group containing polythioethers(3a, b,and5), which were synthesized by the reaction of the corresponding dithiols with 1,3‐dichloro‐2‐propanol(2). The polymer‐supported polythioethers were found to be highly efficient adsorbents of Ag(I), moderately effective for Cu(II), but less effective for Cd(II). For Ag(I) the binding ability of7ais almost independent of the morphology of the polymer support, whereas for Cu(II) the binding ability depends on the morphology. Adsorbed Ag(I) or Cu(II) were removed by treatment with an ammonia solution from the polymer‐supported macrocyclic polythioethers, which can be re‐used without a significant decrease i

ISSN:0025-116X    

DOI:10.1002/macp.1983.021841204

出版商:Hüthig&Wepf Verlag    

年代:1983

数据来源: WILEY

摘要:

AbstractPoly(2,5‐thiophenediylvinylene‐1,4‐phenylenevinylene)s with one or two alkoxy groups as side chains of variable lenghts(8a, band9a – c)were prepared by Wittig‐reaction of 2,5‐thiophenedicarbaldehyde with the corresponding “bis(Wittig‐salt)s”. To establish the structure of the polymers, model compounds10and11were synthesized. Charge‐transfer (donor‐acceptor) complexes were prepared by iodine doping of the polyvinylenes8and9. The room temperature conductivity, σ298K, of the original polymers was found to be increased by several orders of magnitude upon doping. It was not possible to remove all the iodine from the charge‐tran

ISSN:0025-116X    

DOI:10.1002/macp.1983.021841205

出版商:Hüthig&Wepf Verlag    

年代:1983

数据来源: WILEY

摘要:

AbstractNew aromatic polyamides containing azomethine groups in the backbone and also having different linking groups like CH2, CH2CH2, and O were synthesized by reacting 4,4′‐[1,4‐phenylenebis(methylidynenitrilo)]dibenzoyl dichloride(2)with some diamines1a – d, 4,and6by the low temperature solution polycondensation method. The physical, spectral, and thermal properties of the synthesized polyamides were investigated. The effect of the nature of different linking groups on the properties of these aromatic polymides was explored by comparing their spec

ISSN:0025-116X    

DOI:10.1002/macp.1983.021841206

出版商:Hüthig&Wepf Verlag    

年代:1983

数据来源: WILEY

摘要:

AbstractCopolymerizations of alkyl acrylates (alkyl: ethyl, butyl, isobutyl,tert‐butyl, and 2‐ethylhexyl) with vinyl chloride and isobutylene in the presence of catalytic amounts of C2H5AlCl2were studied. Depending on the inonomer feed, equimolar or acrylate‐rich copolymers were obtained in most of these reactions. Onlytert‐butyl acrylate does not produce any copolymers, due to its decomposition under the action of C2H5AICI2. 2‐Ethylhexyl acrylate forms with isobutylene only acrylate‐rich copolymers. By13C NMR spectroscopy it could be shown that equimolar copolymers have an alternatio

ISSN:0025-116X    

DOI:10.1002/macp.1983.021841207

出版商:Hüthig&Wepf Verlag    

年代:1983

数据来源: WILEY

摘要:

AbstractThe influence of time, temperature, and concentration on the addition rate of 2‐phenylbutyric acid(1)to 2,3‐epoxypropanol(4),2,3‐epoxypropyl methacrylate(2), and its polymer3was studied in chloroform and 1, 4‐dioxane. The variation of the yeld with time and concentration of catalyst (tetramethyl ammonium salt of1) can be fairly well represented by the equationv=k[Acid] · [Epoxide]· [Catalyst], withk∼ 0,6 to 0,8 12· mol‐2·h‐1atT= 60°C and [Acid] ≈ 1 mol · 1‐1. The Arrhenius activation energy was found to be 70 to 80 kJ · mol‐1. With variation of the epoxide and acid concentrations

ISSN:0025-116X    

DOI:10.1002/macp.1983.021841208

出版商:Hüthig&Wepf Verlag    

年代:1983

数据来源: WILEY

摘要:

AbstractCuring of 2,2‐bis[4‐(2,3‐epoxypropoxy)phenyl]propane (diglycidyl ether of bisphenol A) (1) withm‐phenylenediamine (2) was performed in a variable temperature probe of a13C FT NMR spectrometer (62,89 MHz). The formation of an initial adduct was directly observed and the progress of polymerisation was followed by recording the13C NMR spectra at time intervals. Unreacted epoxide carbon atoms were detected in one sample as well as in a sample of1cured by a standard pr

ISSN:0025-116X    

DOI:10.1002/macp.1983.021841209

出版商:Hüthig&Wepf Verlag    

年代:1983

数据来源: WILEY

摘要:

AbstractCyclic oligomers of butylene terephthalate(16a – d)were synthesized by cyclocondensations of the corresponding dicarboxylic acid dichlorides(2or13)with diols(4, 10, or15). The linear educts2, 4, 10, 13,and15were obtained by stepwise synthesis. The resulting cyclic esters16a – dwere characterized byIR, NMR, and mass spectrosc

ISSN:0025-116X    

DOI:10.1002/macp.1983.021841210

出版商:Hüthig&Wepf Verlag    

年代:1983

数据来源: WILEY