摘要:

AbstractA new twisted smectic mesophase formed in Tween 80 (1) (monooleate of the ether of sorbitan with 4 mol of polyethyleneglycol)‐water system was found. The induced circular dichroism (CD) spectra of achiral molecules dissolved in this twisted smectic mesophase are compared with those in the thermotropic cholesteric mesophase. Pyrene and fluorene and their derivatives, acridine, phenazine, and phenothiazine were used as achiral molecules (solute molecules). It was found that the signs and shape of the induced CD bands observed in the twisted smectic mesophase were dependent on the solute concentration. The magnitude of the induced CD bands was dependent on the symmetry of the solute molecules and the value of the geometrical ratio of short‐axis to long‐axis of the solute molecules. Furthermore, it was demonstrated that the relative polarization directions of the solute molecules could be determined by means of the induced CD in the Tween 80‐water system using a simple modified C2‐symm

ISSN:0025-116X    

DOI:10.1002/macp.1982.021830421

出版商:Hüthig&Wepf Verlag    

年代:1982

数据来源: WILEY

摘要:

AbstractThe mesophase induced circular dichroism (CD) of biphenyl and its derivatives was investigated using the Tween 80 (monooleate of the ether of sorbitan with 4 mol of polyethyleneglycol)‐water system, which can form a twisted smectic mesophase. The sign of CD bands in this mesophase is explained by a modified C2‐symmetry rule, since it can be considered that alignment of the solute molecules in this mesophase can be elucidated in terms of a pseudo‐C2symmetry, when the concentration of the solute is comparatively high. The assignments of the electronic transitions of the solute molecules show a good accordance with results of magnetic circular dichroism

ISSN:0025-116X    

DOI:10.1002/macp.1982.021830422

出版商:Hüthig&Wepf Verlag    

年代:1982

数据来源: WILEY

摘要:

AbstractThe interaction of polypeptides with dyes in a lyotropic mesophase, consisting of Tween 80 (monooleate of the ether of sorbitan with 4 mol of polyethyleneglycol) and water, was studied, and the arrangement of dyes in the mesophase was discussed on the basis of the spectral change of circular dichroism under an electric field. The following results were observed. (1) The addition of a polypeptide to the mesophase considerably influenced the helical pitch of the mesophase. (2) In the mesophase the complexes of polypeptides with dyes were formed more easily than in aqueous solution. (3) When this mesophase was used as an orientation solvent under the electric field, the observed variation of circular dichroism bands could be used for an assignment of each band polarization. Thus, in the acidic region, acridine orange molecules are bound in such a manner that their long‐axes of molecular plane form a right‐handed super‐helix around the core of the α‐helix of poly(α,L‐glutamic acid). In the alkaline region, the poly(α,L‐glutamic acid)‐acridine orange complex cannot take a helical form, even when the mole ratio of polypeptide residues to dye

ISSN:0025-116X    

DOI:10.1002/macp.1982.021830423

出版商:Hüthig&Wepf Verlag    

年代:1982

数据来源: WILEY

摘要:

AbstractThe molecular parameters of macromolecular networks made by stepwise polymerization of polyfunctional monomers bearing identical reactive groups are established from the calculation of the probability that a functional group leads to a finite chain. The determination of this finite chain probability as a function of reaction extent and characteristics of the system is computed directly from very simple implicit equations. Thus, sol fraction, cross‐link density, effective network chains numbers, dangling trees numbers, and cycle rank are derived easily in very general system

ISSN:0025-116X    

DOI:10.1002/macp.1982.021830424

出版商:Hüthig&Wepf Verlag    

年代:1982

数据来源: WILEY

摘要:

AbstractThe development in the preceding paper is extended to the stepwise polymerization of polyfunctional monomers bearing A and B coreactive groups, a monomer being able to carry together A and B functional groups. The molecular parameters characterizing the post‐gel properties of such macromolecular networks are derived quite as directly as in the order I systems and have expressions which are morphologically analogou

ISSN:0025-116X    

DOI:10.1002/macp.1982.021830425

出版商:Hüthig&Wepf Verlag    

年代:1982

数据来源: WILEY

摘要:

AbstractThe viscoelastic behaviour of polyether‐based polyurethane networks containing sodium tetraphenylborate was investigated by means of dynamic mechanical measurements. A quantitative analysis of the storage modulus dependence on temperature, frequency, and salt concentration gives rise to three superposition correlations, viz. frequency‐temperature, frequency‐concentration, and concentration‐temperature. The frequency‐temperature superposition follows a WLF behaviour, while the other two are approximately linear expressions particularly well verified in the zone of the transit

ISSN:0025-116X    

DOI:10.1002/macp.1982.021830426

出版商:Hüthig&Wepf Verlag    

年代:1982

数据来源: WILEY

摘要:

AbstractBlock oligomers of general formula CH3(CH2)nO[CH2CH2O]9(CH2)nCH3wheren= 0 to 25 have been prepared. All blocks are monodisperse. Examination of their crystallinity (by differential scanning calorimetry, X‐ray scattering, infra‐red and Raman spectroscopy) shows that, within defined limits (n>9, crystallisation temperature high), the block oligomers can crystallise completely. A likely structure is 7/2 helical monoclinic oxyethylene blocks and planar zigzag low density methylene blocks, with the oxyethylene helices normal to the lamella end‐planes and the methylene chains t

ISSN:0025-116X    

DOI:10.1002/macp.1982.021830427

出版商:Hüthig&Wepf Verlag    

年代:1982

数据来源: WILEY

ISSN:0025-116X    

DOI:10.1002/macp.1982.021830428

出版商:Hüthig&Wepf Verlag    

年代:1982

数据来源: WILEY