Temperature dependent rheology of surfactant-hydroxypropyl cellulose solutions.

Temperature dependent rheology of surfactant-hydroxypropyl cellulose solutions.

Date: December 2002
Creator: Snively, C. Todd
Description: The rheology of 1-8% hydroxypropyl cellulose (HPC) solutions has been studied in the temperature range of 20-45 degrees Celsius. The results showed that the relative viscosity at each HPC concentration decreases with increasing temperature. The relative viscosity decreases drastically at about 43 degrees Celsius due to a phase transition. The influence of anionic surfactant, sodium dodecylsulfate (SDS), induced gelation of a 2% HPC solution. The HPC solutions gelled at surfactant SDS concentrations ranging from 0.4 to 1.0 critical micelle concentration (CMC). The gelation of the HPC/SDS hydrogel is explained in the surfactant SDD - bridged HPC linear polymer chains. The complex viscosity - concentration profile was determined below the CMC of the SDS - water pair. The peak itself was a function of frequency indicating the presence of two relaxation times within the gelled network.
Contributing Partner: UNT Libraries
The effects of color concentrate in polyolefins.

The effects of color concentrate in polyolefins.

Access: Use of this item is restricted to the UNT Community.
Date: December 2001
Creator: Flora, Paul
Description: Throughout history consumer products were generally manufactured from wood and metal. They either had to hold their natural color or become subject to painting. When plastics entered the industry, it was recognized for its ease of shaping, re-usability, physical properties and its low cost. One of plastics' greatest benefits is its ability to hold a given color from within allowing it to avoid use of paint. This paper will give a brief overview on the effects of pigments when incorporated in a polyolefin. It will provide a classification of the main types of pigments and how each effect the properties of the product through: crystallization, weatherability, opacity, coloristic values and of course viscosity.
Contributing Partner: UNT Libraries
NBS Viscometer Calibrating Liquids and Capillary Tube Viscometers

NBS Viscometer Calibrating Liquids and Capillary Tube Viscometers

Date: December 26, 1962
Creator: Hardy, R. C.
Description: Report discussing measurements of viscosity made with relative viscometers. These instruments must be calibrated with liquids whose viscosities are known. NBS provides a series of 10 oils for this purpose. Their viscosities range from 0.02 to 450 poises and their temperature coefficients of viscosity range from 2.1 to 9.4 percent per degree C. The less viscous oils are more stable. Correction formulas for errors or conditions are presented.
Contributing Partner: UNT Libraries Government Documents Department
Selected Values of the Physical Properties of Various Materials

Selected Values of the Physical Properties of Various Materials

Date: September 1958
Creator: Tebo, F. J.
Description: Report issued by the Argonne National Laboratory discussing selected physical properties of various solids, liquids, and gases of interest in nuclear reactor heat transfer and fluid flow analysis. In most cases, values for thermal conductivity specific heat, density, viscosity, and Prandtl numbers are given as functions of temperature. This report includes tables, and illustrations.
Contributing Partner: UNT Libraries Government Documents Department
Mathematical Representation of Viscosity of Ionic Liquid + Molecular Solvent Mixtures at Various Temperatures Using the Jouyban-Acree Model

Mathematical Representation of Viscosity of Ionic Liquid + Molecular Solvent Mixtures at Various Temperatures Using the Jouyban-Acree Model

Date: May 6, 2013
Creator: Jouyban, Abolghasem; Soleymani, Jafar; Jafari, Farshad; Khoubnasabjafari, Mehry & Acree, William E. (William Eugene)
Description: Article on mathematical representation of viscosity of ionic liquid and molecular solvent mixtures at various temperatures using the Jouyban-Acree model.
Contributing Partner: UNT College of Arts and Sciences