摘要:

AbstractThe kinetics of polymerization of acrylamide initiated by potassium peroxodisulfate, in the presence and absence of Ag(I) and Cu(II) ions, was studied. The rate law for the polymerization was established. Cu(II) ions were found to reduce both the rate and degree of polymerization.

ISSN:0025-116X    

DOI:10.1002/macp.1979.021800301

出版商:Hüthig&Wepf Verlag    

年代:1979

数据来源: WILEY

摘要:

AbstractSulfadiazinacrylamid was absorbed after oral and intraperitoneal application in rats to a high extent; the absorption from the intraperitoneum was retarded. Glucose treatment delayed the absorption after both application forms. At comparatively high renal and enteral excretion rates the biological half life time of the monomer was estimated to 8 h. A tumouraffinity was not found but there were indications for a preferred storage in the RES.Poly[sulfadiazinacrylamide] was absorbed after intraperitoneal injection to a clear extent, where at the beginning of the treatment under simultaneous glucose load the absorption was delayed. 24 h after injection higher concentrations in metabolic organs and those of the RES were established. After oral application of the polymer an effective resorption was excluded. The elimination of the intraperitoneally injected polymer happened at negligibly low dose rates; after oral application the elimination process was finished within 24 h after treatment of the test animals. The polymer showed no tumouraffinity.

ISSN:0025-116X    

DOI:10.1002/macp.1979.021800302

出版商:Hüthig&Wepf Verlag    

年代:1979

数据来源: WILEY

摘要:

AbstractThe reaction of a nitrile (acetonitrile) with a metalated amine (aniline and benzylamine) was attempted, in order to obtain the corresponding amide via hydrolysis of the amidine. This reaction was also applied for the preparation of polyamides, using diamines and dinitriles. The reaction of aliphatic diamines with aliphatic dinitriles yielded 20–30% of polyamides of low degrees of polymerizatio

ISSN:0025-116X    

DOI:10.1002/macp.1979.021800303

出版商:Hüthig&Wepf Verlag    

年代:1979

数据来源: WILEY

摘要:

AbstractPolycarbonate3was synthesized by copolymerisation of 4‐(p‐hydroxyphenylisopropyl)phenol with [3,5‐Bis(hydroxymethyl)phenylazo]‐methylmalonodinitrile (2a). This azo groups containing polycarbonate was employed as initiator for graft copolymerisations. The content of azo functions in the resulting copolymers was determined by1H NMR, microanalysis, and DSC‐measurements, andMnby vapor pressure osmometry. Grafting was carried out with styrene in 1,4‐dioxane and the resulting products were characterized by IR,1H NMR, HPLC, and vapor pressur

ISSN:0025-116X    

DOI:10.1002/macp.1979.021800304

出版商:Hüthig&Wepf Verlag    

年代:1979

数据来源: WILEY

摘要:

AbstractThe dependence of the apparent dissociation constant and of intrinsic viscosity on the degree of dissociation of 2‐hydroxyethyl methacrylate‐methacrylic acid copolymers was investigated. It was found that the conformational transition indicated in the potentiometric titration was distinct only with copolymers containing at least ca. 48 mole% of methacrylic acid. The transition is probably related with the local configurational and conformational structure while being uncorrelated with the transition of the coiled form of the macromolecule into the expanded

ISSN:0025-116X    

DOI:10.1002/macp.1979.021800305

出版商:Hüthig&Wepf Verlag    

年代:1979

数据来源: WILEY

摘要:

AbstractThe free radical copolymerizations of 6,8‐dimethyl‐4‐oxo‐5‐chromanylmethyl acrylate (DCA) with styrene (St), methyl methacrylate (MMA), and vinyl chloride (VC) by the solution polymerization method were studied. For copolymerization of DCA(M1) with St(M2), the reactivity ratios werer1=0,32,r2=0,70; with MMA(M2) they werer1=0,43,r2=2,00; and with VC(M2) they werer1=4,00,r2=0,08. TheQandevalues for DCA were 0,54 and 0,42, respectively. It was also shown that the chromanone skeleton acts as UV‐absorber, and inhibits photodegradation of the

ISSN:0025-116X    

DOI:10.1002/macp.1979.021800306

出版商:Hüthig&Wepf Verlag    

年代:1979

数据来源: WILEY

摘要:

AbstractBromodifluoroacetaldehyde (5) was prepared from methyl bromodifluoroacetate (4) by reduction with lithium aluminium hydride.4was in turn prepared by bromination of chlorotrifluoroethylene (1) and treatment of the resulting 1,2‐dibromo‐1‐chlorotrifluoroethane (2) with fuming H2SO4and HgO.5, properly purified, could be polymerized with anionic and cationic initiators to poly[oxy‐2‐(bromodifluoro)ethylidene] (12). Certain initiators produce partially or entirely amorphous soluble12of relatively low molecular weight. Most polymers, however, are insoluble, crystalline, and presumably isotactic. Thermal vacuum degradation of the polymers12gave monomer5in essentially quantitative yield. The thermal stability of polymers can significantly be improved by endcapping or treating with agents which replace unstable end groups. The ceiling temperature of the polymerization of5was determined to be +48°C.5was copolymerized with trichloroacetaldehyde with cationic or anionic initiators to copolymers containing predominantly units of5. 5could also be copolymerized with phenyl isocyanate to a polymer containing oxycarbamid

ISSN:0025-116X    

DOI:10.1002/macp.1979.021800307

出版商:Hüthig&Wepf Verlag    

年代:1979

数据来源: WILEY

摘要:

AbstractDuring thermal cleavage of benzpinacol (1) in unsaturated polyester resins only 20–40% of the produced semibenzpinacol radicals (2) react via hydrogen transfer. The other radicals disproportionate into benzophenone and benzhydrol or add directly to the double bonds of the unsaturated polyester resin or to the growing polymer radicals. As during thermal cleavage of benzpinacol bis(trimethylsilyl) ether (5) in unsaturated polyester resins only up to 10% of the diphenyltrimethylsiloxymethyl radicals (6) undergo secondary fragmentation, we suppose that the curing of unsaturated polyester resins with5is initiated mainly by the relatively stable primary radicals6. The different activity of the two compounds1and5in initiating radical polymerisation is explained by different mechanisms in the initiation proces

ISSN:0025-116X    

DOI:10.1002/macp.1979.021800308

出版商:Hüthig&Wepf Verlag    

年代:1979

数据来源: WILEY

摘要:

AbstractCopolymers ofN‐vinylcarbazole (VCZ) with methyl methacrylate (MMA) and styrene (ST) were prepared using doubly‐labelled benzoyl peroxide as initiator and the relative numbers of benzoyloxy and phenyl end‐groups were determined. In the copolymers containing MMA, the ratios of the two types of end‐group are those expected for products of free radical polymerization. The copolymers of VCZ with ST contain benzoyloxy and phenyl end‐groups in proportions which correspond to those found in homopolymers of VCZ made in non‐radical polymerizations promoted by t

ISSN:0025-116X    

DOI:10.1002/macp.1979.021800309

出版商:Hüthig&Wepf Verlag    

年代:1979

数据来源: WILEY

摘要:

AbstractCharge‐transfer complex formation and alternating copolymerization ofp‐oxathiene (POT)‐maleic anhydride (MAnh) system were studied. Relative reactivity of POT‐MAnh complex was obtained from three kinds of terpolymerizations. For example, in terpolymerization of POT, MAnh and acrylonitrile (AN), monomer reactivity ratios of POT‐MAnh complex and AN were found asr1(complex)=55,8 andr2(AN)=0,0176 at 60°C. POT‐MAnh,p‐dioxene‐MAnh and vinyl ether‐MAnh systems were compared in relative reactivity and some physical properties concerning charge‐transfer complex. The reactivity of those MAnh complexes was found to be controlled more significantly by some properties related to electron‐donating power of donors rather than by resonance and polarity terms of s

ISSN:0025-116X    

DOI:10.1002/macp.1979.021800310

出版商:Hüthig&Wepf Verlag    

年代:1979

数据来源: WILEY