摘要:

AbstractOn irradiating poly(N‐chloroamide)s in films or in solution in the range of 325–375 nm carboxamide groups are formed. The irradiated polymer contains chlorine which is linked to C‐atoms. This reaction can certainly not be explained with an intramolecular photorearrangement but with a sequence of photoreactions and dark reactions satisfactorily accounting for all observa

ISSN:0025-116X    

DOI:10.1002/macp.1980.021810201

出版商:Hüthig&Wepf Verlag    

年代:1980

数据来源: WILEY

摘要:

AbstractThe synthesis of some series of oligo(oxytetramethylene oxyterephthaloyl) [oligo(butylene terephthalate)s] with different but well‐defined end groups is described. The separation of artificial mixtures of the oligomers by high pressure liquid chromatography was studied under various elution and column conditions, and thus, the purity of the individual oligomers was demonstrated. The equilibrium melting pointT m0= 236 ± 4°C and the corresponding heat of melting ΔH m0= 28,7 kJ·mol−1of poly(butylene terephthalate) was determined from the analysis of the melting behaviour of the oligomers as depending on the degree of polymerization and the structure of the

ISSN:0025-116X    

DOI:10.1002/macp.1980.021810202

出版商:Hüthig&Wepf Verlag    

年代:1980

数据来源: WILEY

摘要:

AbstractIn connection with the research for new thermostable high molecular weight materials several polybenzimidazoles were prepared by condensing diphenyl 2,2′‐diiodobiphenyl‐4,4′‐dicarboxylate (1) with 3,3′‐diaminobenzidine (2), bis(3,4‐diaminophenyl) ether, 3,3′,4,4′‐tetraaminobenzophenone, 1,2,5,6‐tetraaminoanthraquinone, and 1,2,4,5‐tetraaminobenzene. Depending on the reaction time and temperature, partial replacement of iodine atoms by phenoxy groups occurred in the polymers. Model compounds were prepared by condensation of ester1witho‐phenylenediamine, 2,3‐diaminopyridine, and 3,4‐diaminopyridine. IR, UV, and1H NMR spectra of the model compounds were taken. The high thermostability of the polymers cou

ISSN:0025-116X    

DOI:10.1002/macp.1980.021810203

出版商:Hüthig&Wepf Verlag    

年代:1980

数据来源: WILEY

摘要:

AbstractSeveral potentially thermostable polyamides were prepared. 2,2′‐Diiodobiphenyl‐4,4′‐dicarboxylic acid and its diacid chloride1were synthesized. The latter was condensed with several amines, e.g., aniline,p‐toluidine,p‐chloroaniline, and 2‐aminopyridine, to prepare model compounds of polyamides testing the reactivity of the diacid dichloride1towards various amines, and to compare their spectra with those of the polymers. The polyamides themselves were prepared by solution and melt condensation of diacid chloride1with the following diamines:p‐phenylenediamine,m‐phenylenediamine, 2,6‐diaminotoluene, benzidine, bis(4‐aminophenyl)‐methane, 4,4′‐diaminobiphenyl sulfone, and 3,3′‐diaminobenzophenone. The solubility of the polyamides in different solvents and their inherent viscosities were also measured. The values of the inherent viscosity were in the range of 0,1–1,9. The UV, IR, and1H NMR spectra of the prepared polyamides were recorded. The melting points of the polymers were found to be higher than 360°C and the thermogravimetric curves showed that the po

ISSN:0025-116X    

DOI:10.1002/macp.1980.021810204

出版商:Hüthig&Wepf Verlag    

年代:1980

数据来源: WILEY

摘要:

AbstractPolymerization of methyl methacrylate (MMA) initiated with the system of sodium polyethylenephosphate (PEP‐Na), copper(II) chloride, and water was carried out. The effect of the mass of each component on the conversion of MMA was studied. The polymerization proceeded through a radical mechanism. The overall activation energy was found to be 54,5 kJ·mol−1. The formation of a complex of Cu(II)‐ion with PEP‐Na and water was confirmed by electronic absorption spectra. The initiation mechanism was d

ISSN:0025-116X    

DOI:10.1002/macp.1980.021810205

出版商:Hüthig&Wepf Verlag    

年代:1980

数据来源: WILEY

摘要:

AbstractPoly[2‐(methylsulfinyl)ethyl acrylate] (1) was synthesized as well as derivatives14C‐labelled in side groups (6) or14C‐labelled in the main chain (11). Polymer11with the14C‐labelled main chain was fractionated by precipitation. The η‐M‐relation determined by measurements of unlabelled polymers in the ultracentrifuge for comparison was used to establish the viscosimetrically determined molecular weights of the labelled fractions. After intravenous application of aqueous solutions of the polymer in rats the excretion rate up to 72 h after treatment was ascertained to ca. 50%; the concentration in the blood serum was found to be strikingly high. A tendency to reinforced storage in organs of high phagocytose activity by growing molecular weight was observed. The tumor affinity was — i

ISSN:0025-116X    

DOI:10.1002/macp.1980.021810206

出版商:Hüthig&Wepf Verlag    

年代:1980

数据来源: WILEY

摘要:

AbstractCopolymers of methacrylaldehyde with hydrophilic monomers — 2‐hydroxyethyl methacrylate, 5‐hydroxy‐3‐oxapentyl methacrylate, 8‐hydroxy‐3,6‐dioxaoctyl methacrylate,N‐ethylmethacrylamide,N,N‐diethylacrylamide, andN,N‐diethylmethacrylamide — were prepared by solution polymerization inN,N‐dimethylformamide initiated with 2,2′‐azodiisobutyronitrile. In the copolymer of methacrylaldehyde (1) with 2‐hydroxyethyl methacrylate (2) (r1= 0,77,r2= 0,36) and in the copolymer of methacrylaldehyde withN,N‐diethylacrylamide (r1= 3,79,r2= 0,14) the content of CHO groups corresponds to that ot methacrylaldehyde units in the triads comonomer — methacrylaldehyde — comonomer; in the copolymer of methacrylaldehyde withN‐ethylmethacrylamide (r1= 4,07,r2= 0,14) both comonomers react with each other and the content of CHO groups is very low, while in the copolymer of methacrylaldehyde with 5‐hydroxy‐3‐oxapentyl methacrylate (r1= 1,48,r2= 0,34) the majority of methac

ISSN:0025-116X    

DOI:10.1002/macp.1980.021810207

出版商:Hüthig&Wepf Verlag    

年代:1980

数据来源: WILEY

摘要:

AbstractA series of pure ethylene polymerizations performed to maximum pressures of 2,5 kbar and temperatures up to 250°C is discussed. The rate data which are obtained via quantitative infrared and near infrared spectroscopy closely fit to an overall polymerization rate law of the order 2,5 ± 0,2 in the ethylene concentration. The overall activation energy is determined to be 136,3 ± 6 kJ/mol. For the initiation reaction an activation energy of 209,8 ± 12 kJ/mol is derived. This fairly large value establishes that in dense high purity ethylene a thermally initiated (spontaneous) reaction to high molecular weight material occ

ISSN:0025-116X    

DOI:10.1002/macp.1980.021810208

出版商:Hüthig&Wepf Verlag    

年代:1980

数据来源: WILEY

摘要:

AbstractNMR chemical shifts of the methoxyl and α‐methyl protons in the alternating methyl methacrylate‐styrene copolymer are calculated by taking into account the contributions of the diamagnetic shielding and the magnetic anisotropy effect of the benzene rings in styrene units. The conformational probabilities of the copolymer chain are calculated according to Flory's matrix method. It is deduced from the calculation that NMR should occur at higher field for the methoxyl and at lower field for the α‐methyl protons of the methyl methacrylate unit in meso configuration with an adjacent styrene unit (regarding the methoxycarbonyl and phenyl groups) than for the corresponding protons in the unit of racemic configuration. Further, the differences between the chemical shifts for these protons in meso and racemic dyads are nearly equivalent to the differences in chemical shifts between two adjacent peaks of the observed triplet spectra. This result indicates that the spectral assignment based on a theoretical calculation is quite consistent with the one made by a conventional simulation method: from the lower magnetic field, peaks of cosyndiotactic, coheterotactic, and coisotactic triads appear in this order for the methoxyl protons and in the opposite order for the α‐methyl protons. Magnetic anisotropy effect contributes to these tacticity‐dependent chemical shifts to a far greater extent than diamagnetic shielding. The variation of the chemical shifts due to measuring temperature, probability of isotactic addition, and interactions between groups more than five bonds apart is al

ISSN:0025-116X    

DOI:10.1002/macp.1980.021810209

出版商:Hüthig&Wepf Verlag    

年代:1980

数据来源: WILEY

摘要:

AbstractSteady shear viscosities were measured over a range of shear rates from lower to upper‐Newtonian flow region for solutions of polystyrene in the high‐viscosity solvent tricresyl phosphate at three different temperatures. The influence of solvent viscosity on the non‐Newtonian flow property was studied and compared with the results obtained previously by use of a lowviscosity solvent with similar solvent power for polystyrene as tricresyl phosphate. For the moderately concentrated solutions, the non‐Newtonian viscosity could be explained by Graessley's entanglement viscosity theory modified by a frictional viscosity. The result shows that only the frictional viscosity is affected by variation of solvent viscosity. As the entanglement viscosity decreases with increasing shear rate and is practically masked by the shear independent frictional viscosity, the flow appears as to be upper‐Newtonian in spite of the difference in solvent viscosity. The lower critical concentration for entanglement was determined on the basis of a lower limit for the applicability of the modified Graessley theory. The values of the critical concentrations are independent of the magnitude of solvent vi

ISSN:0025-116X    

DOI:10.1002/macp.1980.021810210

出版商:Hüthig&Wepf Verlag    

年代:1980

数据来源: WILEY