Assignment of the Glass Transition - read free eBook in online reader or directly download on the web page. Select files or add your book in reader. Download and read online ebook Assignment of the Glass Transition write by Rickey J. Seyler. This book was released on 1994. Assignment of the Glass Transition available in PDF, EPUB and Kindle.
Assignment of Glass Transition Temperatures Using Thermomechanical Analysis
Assignment of Glass Transition Temperatures Using Thermomechanical Analysis - read free eBook in online reader or directly download on the web page. Select files or add your book in reader. Download and read online ebook Assignment of Glass Transition Temperatures Using Thermomechanical Analysis write by CM. Earnest. This book was released on 1994. Assignment of Glass Transition Temperatures Using Thermomechanical Analysis available in PDF, EPUB and Kindle. The use of thermomechanical analysis (TMA) as a tool for assignment of glass transition temperatures, Tg, is discussed in this paper. An attempt to address the minimum requirements of TMA instrumentation necessary for Tg assignments is included. The subject of temperature calibration of the TMA instrument, which is a prerequisite for any temperature of transition assignment, is discussed. Methodology is offered for using the TMA nstrument in the expansion mode for Tg assignments. In addition, TMA methodology mploying a flat-tipped penetration probe for the assignment of the softening temperature, Ts, is also given here. For most amorphous materials, Ts is very close to the Tg value assigned by expansion TMA or differential scanning calorimetry (DSC).
Standard Test Method for Assignment of a Glass Transition Temperature Using Thermomechanical Analysis
Standard Test Method for Assignment of a Glass Transition Temperature Using Thermomechanical Analysis - read free eBook in online reader or directly download on the web page. Select files or add your book in reader. Download and read online ebook Standard Test Method for Assignment of a Glass Transition Temperature Using Thermomechanical Analysis write by . This book was released on 2008. Standard Test Method for Assignment of a Glass Transition Temperature Using Thermomechanical Analysis available in PDF, EPUB and Kindle.
Assigning the Glass Transition Temperature in Oriented Poly(ethylene Terephthalate)
Assigning the Glass Transition Temperature in Oriented Poly(ethylene Terephthalate) - read free eBook in online reader or directly download on the web page. Select files or add your book in reader. Download and read online ebook Assigning the Glass Transition Temperature in Oriented Poly(ethylene Terephthalate) write by MJ. Moscato. This book was released on 1994. Assigning the Glass Transition Temperature in Oriented Poly(ethylene Terephthalate) available in PDF, EPUB and Kindle. Thermoplastics like poly(ethylene terephthalate) (PET) can be melt processed into sheet and film formats for a variety of applications. Fabrication of these formats often involves application of a drawing process which can include drafting, tentering, heat setting, detentering, and heat relaxation. These various components add a thermomechanical history to the PET that will influence the glass transition. Thermomechanical analysis (TMA) in both the compressive mode and the tensile mode along with differential scanning calorimetry (DSC) techniques have been applied to a series of seven PET films generated using different drawing processes applied with an Iwamoto Biaxial Stretcher on extruded sheet from a single source. These measurements were undertaken to assign a glass transition temperature for each film. The assigned temperature ranged between 70°C and 94°C. Orientation and heat setting increased the temperature assigned as Tg while detentering both increased and lowered Tg on a direction-specific basis. Both the measurement technique and the assignment protocol employed to determine Tg contributed to differences in the assigned value. DSC results suggested the presence of two amorphous domains (mobile and constrained) in the film oriented uniaxially without constraint. TMA data demonstrated the assigned Tg may be direction specific and not a bulk property in oriented PET films.
Glass Transition of a Liquid Crystal Polymer
Glass Transition of a Liquid Crystal Polymer - read free eBook in online reader or directly download on the web page. Select files or add your book in reader. Download and read online ebook Glass Transition of a Liquid Crystal Polymer write by B. Cassel. This book was released on 1994. Glass Transition of a Liquid Crystal Polymer available in PDF, EPUB and Kindle. A commercially available liquid crystal polymer system having a very weak glass transition is investigated in order to illustrate the special problems of measurement and interpretation inherent in high-sensitivity Tg measurement. Differential scanning calorimetry, thermomechanical analysis, and dynamic mechanical analysis were employed over the temperature region from ambient to 175°C. A transition between 75 and 125°C with a midpoint around 100°C was detected by most techniques. The use of the maximum in the derivative of the measured signal as the primary assignment of the glass transition temperature is recommended. The results are discussed with reference to other literature on this polymer system.
