Glass transition temperature changes of melt-blended polymer nanocomposites containing finely dispersed ZnO quantum dots

Soft Matter ◽  
2010 ◽  
Vol 6 (18) ◽  
pp. 4482 ◽  
Author(s):  
Minhao Wong ◽  
Ryotaro Tsuji ◽  
Steven Nutt ◽  
Hung-Jue Sue
Keyword(s):  
Quantum Dots ◽  
Glass Transition ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
Polymer Nanocomposites ◽  
Temperature Changes ◽  
Blended Polymer ◽  
Zno Quantum Dots

scholarly journals The effect of size and concentration of nanoparticles on the glass transition temperature of polymer nanocomposites

RSC Advances ◽  
2017 ◽  
Vol 7 (79) ◽  
pp. 50113-50120 ◽  
Author(s):  
Olga A. Serenko ◽  
Vyacheslav I. Roldughin ◽  
Andrey А. Askadskii ◽  
Elena S. Serkova ◽  
Pavel V. Strashnov ◽  
...  
Keyword(s):  
Glass Transition ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
Polymer Nanocomposites ◽  
Polyphenylene Dendrimers

Here we use model nanocomposites based on polystyrene and polyphenylene dendrimers to show both theoretically and experimentally that inclusion of rigid nanoparticles of 2.3–5 nm size into the polymer leads to a negligible glass transition temperature (Tg) increase.

Temperature Dependence of Free Volume in Epoxy/Rectorite Nanocomposites by Positron Annihilation

2008 ◽  
Vol 607 ◽  
pp. 210-212
Author(s):  
Ming Zhang ◽  
Shao Jie Wang ◽  
L.M. Liu ◽  
Peng Fei Fang
Keyword(s):  
Glass Transition ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
Low Temperature ◽  
Temperature Dependence ◽  
Viscous Flow ◽  
Polymer Nanocomposites ◽  
Free Volume ◽  
Softening Temperature ◽  
Flow Temperature

Recently polymer nanocomposites[1,2] have been receiving special attention because of its advantages and unique properties in comparison to the traditional polymer composites.The structural transformation of Epoxy (cured by polyamide) and epoxy/Rectorite nanocomposite(with 0.5% rectorite content) is studied by PALS as a function of temperature from 30K to 490K. For Epoxy and Epoxy/Rectorite nanocomposite, the glass transition temperature (Tg) is observed to be 270K and 260K, the second transition temperature (Tγ) is 160K and 120K, the viscous flow temperature (Tf) is the same as 380K. The result shows that properties of the free-volume in nanocomposite have been changed by the rectorite platelets fully separated in material at low temperature. At the same time, we find that the intensity of o-Ps decreases with increase of the temperature at the softening temperature above the Te.

scholarly journals Direct measurement of X-ray induced heating of microcrystals

2019 ◽  
Author(s):  
Anna J Warren ◽  
Danny Axford ◽  
Robin L Owen
Keyword(s):  
Glass Transition ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
Temperature Control ◽  
Macromolecular Crystallography ◽  
Temperature Dependent ◽  
Temperature Changes ◽  
X Ray ◽  
Dose Rates ◽  
Validation Tool

AbstractTemperature control is a key aspect of macromolecular crystallography, with the technique of cryocooling routinely used to mitigate X-ray induced damage. Beam induced heating could cause the temperature of crystals to rise above the glass transition temperature, greatly increasing the rate of damage. X-ray induced heating of ruby crystals 20-40 microns in size has been quantified non-invasively by monitoring the emission wavelengths of X-ray induced fluorescence during exposure to the X-ray beam. For beamsizes and dose-rates typically used in macromolecular crystallography the temperature rises are of order 20 K. The temperature changes observed are compared with models in the literature and can be used as a validation tool for future models.SynopsisX-ray induced heating of micro-crystals is quantified through the temperature-dependent shift in X-ray induced fluorescence from ruby crystals.

Experimental Investigation and Monte Carlo Simulation of Glass Transition in Polymer Nanocomposites

2005 ◽  
Vol 23 ◽  
pp. 339-342 ◽  
Author(s):  
Rengaswamy Jayaganthan ◽  
Rohitkumar H. Vora
Keyword(s):  
Experimental Investigation ◽  
Monte Carlo Simulation ◽  
Monte Carlo ◽  
Glass Transition ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
Polymer Nanocomposites ◽  
Clay Nanocomposites

The glass transition temperature (Tg) of Fluoro-Poly(ether-imide) and Fluoro-Poly(either-Imide)/MMY clay Nanocomposites has been investigated by both experiments and Monte Carlo Simulation. It was observed that the (Tg) values of the nanocomposites increases with increase in clay contents.

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