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.

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.

Free Volumes in Polymer Nanocomposites

2008 ◽  
Vol 607 ◽  
pp. 177-179 ◽  
Author(s):  
Hong Min Chen ◽  
L. James Lee ◽  
Jin Tao Yang ◽  
Xiao Hong Gu ◽  
Yan Ching Jean
Keyword(s):  
Carbon Dioxide ◽  
Glass Transition ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
Positron Annihilation ◽  
Polymer Nanocomposites ◽  
Carbon Nanofiber ◽  
Positron Annihilation Lifetime Spectroscopy ◽  
Combination Effect ◽  
Positron Annihilation Lifetime

We have employed positron annihilation lifetime spectroscopy to measure the free volumes in nanocomposites of polystyrene with addition of carbon nanofiber (CNF) and carbon dioxide as a function of composition and of temperature. We found that the glass transition temperature (Tg) increases as a function of CNF compositions but significantly decreases as the exposure of CO2. We also investigate the combination effect of CNF and CO2 and found that the CO2 significantly weakens the bonding between PS and CNF interfaces. The Tg changes are compared with DSC.

Effect of hybrid nanoparticles on glass transition temperature of polymer nanocomposites

2015 ◽  
Vol 37 (7) ◽  
pp. 1978-1990 ◽  
Author(s):  
Vjacheslav I. Roldughin ◽  
Olga A. Serenko ◽  
Elena V. Getmanova ◽  
Natalia A. Novozhilova ◽  
Galina G. Nikifirova ◽  
...  
Keyword(s):  
Glass Transition ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
Polymer Nanocomposites ◽  
Hybrid Nanoparticles
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