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1

Digitale Medien

The connection between the measured glass transition temperature and the time dependent order parameter description of the glass transition (1981)

Havliček, Ivan

Springer

Polymer bulletin 5 (1981), S. 597-601

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ISSN: 1436-2449

Quelle: Springer Online Journal Archives 1860-2000

Thema: Chemie und Pharmazie , Maschinenbau , Physik

Notizen: Summary The time dependent order parameter concept of the glass transition is used in a description of the relaxation behaviour of the glassforming material. The connection between the macroscopic theory and the measured glass transition temperature has been determined. It has been found that in a case when the Prigogine-Defay ratio is greater than unity, different values of the relaxation functions of entropy and volume obtained by different experiments (e.g., isobaric dilatometry and isothermal compression) should be used in order to obtain the identical Tg. The Prigogine-Defay ratio is found to be a decreasing function of the observation time reaching values between unity in the limit of infinite time and a limit which corresponds to extremely short experiments.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF00255298

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2

Digitale Medien

Separation of styrene oligomers by Supercritical Fluid Chromatography (SFC) using a modified HPCL-instrument (1981)

Schmitz, Franz P. ; Klesper, Ernst

Springer

Polymer bulletin 5 (1981), S. 603-608

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ISSN: 1436-2449

Quelle: Springer Online Journal Archives 1860-2000

Thema: Chemie und Pharmazie , Maschinenbau , Physik

Notizen: Summary An instrument for High Performance Liquid Chromatography (HPLC) was modified by relatively simple means for working in the field of Supercritical Fluid Chromatography (SFC). By use of this modified apparatus three different gradient methods were tried with respect to their applicability for the analytical separation of oligomers. Especially by using a gradient in eluent composition or by a pressure gradient good resolution could be obtained.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF00255299

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3

Digitale Medien

Synthesis of ABA triblock copolymers containing electrono-donor or electrono-acceptor pendant groups in A blocks (1981)

Percec, Virgil

Springer

Polymer bulletin 5 (1981), S. 643-649

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ISSN: 1436-2449

Quelle: Springer Online Journal Archives 1860-2000

Thema: Chemie und Pharmazie , Maschinenbau , Physik

Notizen: Summary α,ω-p-Toluensulphonic acid ester of poly(ethyleneglycoladipate) was synthesized and used to initiate the cationic isomerization polymerization of 2-phenyl-2-oxazoline, 2-(β-N-Carbazolylethyl)-2-oxazoline and 2-(3,5-dinitrophenyl)-2-oxazoline. ABA triblock copolymers containing poly(N-benzoylethylenimine), poly [N-β(N-carbazolyl)propionyl ethyleneimine] or poly(3,5-dinitrobenzoylethylenimine) blocks (A block) and poly (ethyleneglycoladipate) blocks (B block) have been synthesized.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF00255305

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4

Digitale Medien

Effect of nucleating agents upon the kinetics of polybutene-1 crystallization (1981)

Cortazar, Milagros ; Guzmán, Gonzalo M.

Springer

Polymer bulletin 5 (1981), S. 635-641

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ISSN: 1436-2449

Quelle: Springer Online Journal Archives 1860-2000

Thema: Chemie und Pharmazie , Maschinenbau , Physik

Notizen: Summary The influence of various nucleating agents on the crystallization parameters of polybutene-1 is reported. Isothermal crystallization is investigated by differential scanning calorimetry. The morphology induced by the differents nucleating agents has been observed by hot stage polarizing microscopy. It has been stated that the addition of nucleating agent affects the crystallization rate, dimension and homogeneity of spherulitic sizes. The induction time ti, the semicrystallization time t1/2, the crystallization rate constant K, and the Avrami coefficient n were measured and related to the different characteristics of the specimens. Because of the fractional values of n obtained in this study, it is not possible to propose well determined mechanisms of crystallization.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF00255304

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5

Digitale Medien

NMR study on phase transitions in lyotropic liquid crystals caused by hydrophobic additives (1981)

Derzhanski, A. ; Zheliaskova, A.

Springer

Polymer bulletin 5 (1981), S. 667-672

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ISSN: 1436-2449

Quelle: Springer Online Journal Archives 1860-2000

Thema: Chemie und Pharmazie , Maschinenbau , Physik

Notizen: Summary Broad line NMR spectra have been measured at room temperature of the binary system Arkopal (C9H19C6H4O(CH2CH2O)15H) -heavy water (40 % to 60 % by weight) and of the ternary systems Arkopal — heavy water — paraffin at different paraffin concentrations at constant Arkopal — heavy water ratio. It has been established how the additives change the lyotropic phases.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF00255308

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6

Digitale Medien

Plasma-induced polymerization (1981)

Simionescu, Cristofor I. ; Simionescu, Bogdan ; Leanca, Monica ; [weitere]

Springer

Polymer bulletin 5 (1981), S. 61-66

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ISSN: 1436-2449

Quelle: Springer Online Journal Archives 1860-2000

Thema: Chemie und Pharmazie , Maschinenbau , Physik

Notizen: Summary Investigations carried out in plasma-induced polymerization (copolymerization) led to the idea of the existence of “living” macroradicals. Their presence in both homogeneous and heterogeneous media was experimentally proved and theoretically explained and their use as macromolecular initiators in polymerization processes is exemplified.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF00256136

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7

Digitale Medien

Physico-chemical studies of polymeric carriers: 2. Molecular mass determination of poly(N-vinylpyrrolidone-co-maleic acid) fractions (1981)

Csákvári, Éva ; Azori, Mária ; Tüdős, Ferenc

Springer

Polymer bulletin 5 (1981), S. 673-677

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ISSN: 1436-2449

Quelle: Springer Online Journal Archives 1860-2000

Thema: Chemie und Pharmazie , Maschinenbau , Physik

Notizen: Summary Critical interpretation of the various conceptions concerning the problems in characterization of linear polyelectrolyte type polymers containing maleic acid as a comonomer is given. Proper conditions to avoid the fundamental experimental difficulties are proposed. Our conception is supported by molecular light scattering measurements of hydrolysed, fractionated poly (N-vinylpyrrolidone-co-maleic anhydride) samples. It was found that the problems were eliminated by the reduction of the degree of dissociation of carboxyl groups to a minimum value.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF00255309

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8

Digitale Medien

Relationship between preferential adsorption coefficient and intrinsic viscosity in ternary systems (1981)

Katime, Issa A. ; Amo, B.

Springer

Polymer bulletin 5 (1981), S. 67-74

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ISSN: 1436-2449

Quelle: Springer Online Journal Archives 1860-2000

Thema: Chemie und Pharmazie , Maschinenbau , Physik

Notizen: Summary The relation proposed between the preferential adsorption coefficient, λ, and the intrinsic viscosity, ¦η¦ λ¦η¦=λ∞¦η¦+AKθ has been applied in this paper to previously published data. This equation is found to be valid in theta condi tions and far away from them. The obtained results are compared to the ones calculated with the Dondos-Benoit equation.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF00256137

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9

Digitale Medien

Acid and enzymic hydrolysis of Kappa carrageenan (1981)

Rochas, Cyrille ; Heyraud, Alain

Springer

Polymer bulletin 5 (1981), S. 81-86

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ISSN: 1436-2449

Quelle: Springer Online Journal Archives 1860-2000

Thema: Chemie und Pharmazie , Maschinenbau , Physik

Notizen: Summary This paper describes the acid and enzymic hydrolysis of Kappa carrageenan and the gel permeation chromatography of the charged oligosaccharides.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF00256139

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10

Digitale Medien

An empirical model for the melt viscosity of polymer blends (1981)

Dobrescu, Viorica

Springer

Polymer bulletin 5 (1981), S. 75-80

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ISSN: 1436-2449

Quelle: Springer Online Journal Archives 1860-2000

Thema: Chemie und Pharmazie , Maschinenbau , Physik

Notizen: Summary On the basis of experimental data for blends of polyethylene with different polymers an empirical equation is proposed to describe the dependence of melt viscosity of blends on component viscosities and composition. The model ensures the continuity of viscosity vs. composition curves throughout the whole composition range, the possibility of obtaining extremum values higher or lower than the viscosities of components, allows the calculation of flow curves of blends from the flow curves of components and their volume fractions.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF00256138

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