摘要:

Improved syntheses of 5- and 6-aminosaccharins are described. The preparation and characterization of 4-nitro-2-sulfobenzoic anhydride, ethyl 4-nitro- and 4-amino-2-sulfamidobenzoates, and triethylammonium 6-amino-sacchatinate are also described. The direct ring nitration of saccharin and of two of its derivatives was attempted, and the results of these reactions and of the attempted preparation of aminosulfobenzoic anhydrides are detailed. A general procedure for the conversion of benzosulfonimide to the corresponding sulfobenzoic anhydride in high yield is also given.

ISSN:0022-233X    

DOI:10.1080/10601326908051926

出版商:Taylor & Francis Group    

年代:1969

数据来源: Taylor

摘要:

The model chelating compounds, N-(p-hydroxyphenyl)glycine, N-(p-methoxyphenyl)glycine, N-methyl-N-(p-hydroxyphenyl)glycine, N-(p-hydroxyphenyl)iminodiacetic acid, N-(p-hydroxybenzyl)glycine, and N-(p-hydroxyphenylethyl)iminodiacetic acid, were synthesized and characterized by composition analysis and infrared spectroscopy. Their chelating characteristics with Cu(II), Ni(II), Co(II), and Zn (II) ions were established by composition analysis and comparative infrared spectroscopy.

ISSN:0022-233X    

DOI:10.1080/10601326908051927

出版商:Taylor & Francis Group    

年代:1969

数据来源: Taylor

摘要:

According to elementary statistical theory of rubber elasticity, the modulus of rigidity τ/(λ - λ−2) is constant. The phenomenological theory predicts that this modulus is in first approximation equal to the sum of a constant (2C1) and a deformation-dependent term, 2C2. The dependence on elongation of experimental modulus data of many elastomers agrees more or less with the C2term. Several attempts have been made to explain this dependence on the basis of molecular phenomena or by refinements of the statistical theory of elasticity. At present there is no consensus of opinion on the origin or interpretation of the deformation-dependent term. Almost all of the data on this dependence have been generated in extension experiments.

ISSN:0022-233X    

DOI:10.1080/10601326908051928

出版商:Taylor & Francis Group    

年代:1969

数据来源: Taylor

摘要:

The infrared spectra (4000–650 cm−1) of a series of polyurethane elastomers synthesized from polytetrahydrofuran, diphenylmethane-4,4′-diisocyanate, and ethylenediamine were examined. By comparing the spectra with those of the constituent polytetrahydrofuran and of the model compounds for the hard segments of the elastomers containing the urea, urethane, and diphenylmethane groups, most of the stronger bands could be assigned with reasonable assurance to the vibrations of each constituent part. The frequencies of the urea and the urethane characteristic bands correspond to complete association of the polar groups in the polymers. The spectral changes produced by uniaxially stretching polyurethane films can be interpreted as due to the induced crystallization of the polyether blocks in the elastomer, which remain amorphous in the undistorted state. Polarization measurements on stretched samples confirmed that the polyether chains are oriented parallel to the direction of the stretch.

ISSN:0022-233X    

DOI:10.1080/10601326908051929

出版商:Taylor & Francis Group    

年代:1969

数据来源: Taylor

摘要:

One of the simplest polymerization mechanisms arises during the course of forming linear condensation polymers by the intermolecular reaction of bifunctional compounds.

ISSN:0022-233X    

DOI:10.1080/10601326908051930

出版商:Taylor & Francis Group    

年代:1969

数据来源: Taylor

ISSN:0022-233X    

DOI:10.1080/10601326908051931

出版商:Taylor & Francis Group    

年代:1969

数据来源: Taylor

ISSN:0022-233X    

DOI:10.1080/10601326908051932

出版商:Taylor & Francis Group    

年代:1969

数据来源: Taylor

ISSN:0022-233X    

DOI:10.1080/10601326908051933

出版商:Taylor & Francis Group    

年代:1969

数据来源: Taylor

ISSN:0022-233X    

DOI:10.1080/10601326908051934

出版商:Taylor & Francis Group    

年代:1969

数据来源: Taylor

摘要:

This is a scanned image of the original Editorial Board page(s) for this issue.

ISSN:0022-233X    

DOI:10.1080/10601326908051915

出版商:Taylor & Francis Group    

年代:1969

数据来源: Taylor