scholarly journals Spinnability of Liquid. A Visco-elastic State. I. Spinnability and Anomalous Viscosity

1952 ◽  
Vol 25 (2) ◽  
pp. 88-93 ◽  
Author(s):  
Tsurutaro Nakagawa
Keyword(s):  
Elastic State ◽  
Anomalous Viscosity

Elasto-plastic state of curve beam system subjected to complex loading

1996 ◽  
Vol 18 (4) ◽  
pp. 14-22
Author(s):  
Vu Khac Bay
Keyword(s):  
Cylindrical Shell ◽  
Solution Method ◽  
Complex Loading ◽  
Numerical Results ◽  
Elastic Solution ◽  
Plastic State ◽  
Curve Beam ◽  
Elastic State ◽  
Elastic Plastic ◽  
Beam System

Investigation of the elastic state of curve beam system had been considered in [3]. In this paper the elastic-plastic state of curve beam system in the form of cylindrical shell is analyzed by the elastic solution method. Numerical results of the problem and conclusion are given.

The Rubber Elastic State

1999 ◽  
pp. 39-53
Author(s):  
Ulf W. Gedde
Keyword(s):  
Elastic State

scholarly journals STUDIES ON THE ANOMALOUS VISCOSITY AND FLOW-BIREFRINGENCE OF PROTEIN SOLUTIONS

1944 ◽  
Vol 27 (3) ◽  
pp. 233-271 ◽  
Author(s):  
A. S. C. Lawrence ◽  
Margaret Miall ◽  
Joseph Needham ◽  
Shih-Chang Shen
Keyword(s):  
Film Flow ◽  
Surface Film ◽  
Mosaic Disease ◽  
Flow Birefringence ◽  
Bulk Phase ◽  
Protein Solutions ◽  
Amphibian Embryo ◽  
Anomalous Viscosity ◽  
Group A ◽  
Group B

1. An extensive investigation has been made of protein particle shape using the methods of flow-birefringence and anomalous viscosity measurement in the coaxial cell. 2. As a result of investigations on a number of proteins, it is concluded that they may be divided into four groups. Group A consists of those which show flow-anomaly both in the bulk phase and in the surface film. These also show flow-birefringence in the bulk phase. Examples: tobacco mosaic disease virus nucleoprotein; myosin. Though corpuscular proteins, they have elongated particles before denaturation. Group B consists of those which show flow-anomaly only (in the first instance) in the surface film, and no flow-birefringence in the bulk phase. They are probably close to spherical in shape in solution, but form elongated particles as they denature in the surface film. After this process has been completed, they may show flow-anomaly also in the bulk phase. Some proteins show flow-anomaly in the surface film immediately it forms, others only show it after a certain time has elapsed for the building up of the film. We designate the former as group B1 and the latter as group B2. Group B1, immediate surface film flow-anomaly. Examples: serum euglobulin, amphibian embryo euglobulin b. Group B2, slowly appearing surface film flow-anomaly. After the film has once been fully formed and then dispersed by shaking, the solution may have the properties of that of a protein in group B1; i.e., anomalous flow in the film may occur immediately on testing in the viscosimeter. Examples: avian ovalbumin, amphibian embryo pseudoglobulin. Group C consists of those proteins which show flow-anomaly neither in the bulk phase nor in the surface film, under the conditions used by us. They are probably close to spherical in shape. Examples: insulin, methaemoglobin, amphibian embryo euglobulin c, mucoproteins. 3. The theoretical significance of protein fibre molecules, whether native or formed by denaturation in the living cell, is discussed, especially in relation to experimental morphology and cytology.

scholarly journals Термомеханический анализ эффекта памяти формы полиуретанового композита, используемого для создания развертываемых конструкций космического назначения

2019 ◽  
Vol 45 (9) ◽  
pp. 32
Author(s):  
Т.А. Шалыгина ◽  
С.Ю. Воронина ◽  
А.Ю. Власов ◽  
К.А. Пасечник ◽  
И.В. Обверткин
Keyword(s):  
Shape Memory ◽  
Shape Memory Effect ◽  
Memory Effect ◽  
Recovery Rate ◽  
Viscoelastic Properties ◽  
Original Form ◽  
Elastic State ◽  
Three Point Bending ◽  
Polyurethane Composite

The possibility of using a three-point bending clamp thermomechanical analyzer for study the shape memory effect of a constructional polyurethane composite is investigated. The viscoelastic properties of the sample in the region of the transition from the glassy to the highly elastic state are studied. The parameters affecting the recovery rate of the original form (Rr) and the fixation factor of the temporary form (Rf) are determined. The conditions for deforming and cooling the polyurethane composite are established, which allow to achieve the values of Rr = 99.98% and Rf = 99.70%.

Anomalous viscosity behavior of polymer solutions at very low concentrations

1957 ◽  
Vol 26 (113) ◽  
pp. 213-226 ◽  
Author(s):  
Tōru Kawai ◽  
Kazuhisa Saito ◽  
W. R. Krigbaum
Keyword(s):  
Polymer Solutions ◽  
Anomalous Viscosity ◽  
Viscosity Behavior ◽  
Low Concentrations

Thermopolarization Phenomena in the Temperature Range of Glass Transition of Amorphous Polydiethylsiloxane

2018 ◽  
Vol 773 ◽  
pp. 15-19
Author(s):  
I.V. Popov
Keyword(s):  
Glass Transition ◽  
Amorphous Phase ◽  
Elastic State ◽  
Structural Units ◽  
Flexible Chain ◽  
Experimental Conditions ◽  
Temperature Range ◽  
Maximum Value ◽  
Temperature Dependences ◽  
Amorphous Phase Formation

The transition from the glass to the highly elastic state in polydiethylsiloxane (PDES) is not reflected on the temperature dependences of the relative permittivity, the dielectric loss tangent, and the specific volumetric electrical conductivity. But, the peak of the current of thermostimulated depolarization (TSD) is fixed in the temperature range of the transition to the highly elastic state. The peak of the TSD current at T ~ 130K indicates a continuous amorphous phase formation in the experimental conditions. The maximum value of the TSD current directly depends on the content of the amorphous phase in the polymer. The cooling of the polymer in an electric field reduces the magnitude of the peak. Exposure in the mesophase leads to an almost complete absence of thermopolarization effects near the glass transition temperature. This peak of the TSD current in the absence of preliminary polarization is characteristic, presumably, only for flexible-chain polymers where structural units have pyroelectric properties. Under certain conditions, PDES demonstrates itself as an active dielectric in the temperature range of 90 - 180K.

Sign in / Sign up

Export Citation Format

Share Document