Polymer-nanoparticle interfacial interactions in polymer nanocomposites: Confinement effects on glass transition temperature and suppression of physical aging

2006 ◽  
Vol 44 (20) ◽  
pp. 2935-2943 ◽  
Author(s):  
Perla Rittigstein ◽  
John M. Torkelson
Keyword(s):  
Glass Transition ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
Polymer Nanocomposites ◽  
Physical Aging ◽  
Confinement Effects ◽  
Interfacial Interactions ◽  
Polymer Nanoparticle

scholarly journals Physical Aging Behavior of a Glassy Polyether

Polymers ◽  
2021 ◽  
Vol 13 (6) ◽  
pp. 954
Author(s):  
Xavier Monnier ◽  
Sara Marina ◽  
Xabier Lopez de Pariza ◽  
Haritz Sardón ◽  
Jaime Martin ◽  
...  
Keyword(s):  
Glass Transition ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
Physical Aging ◽  
Glassy State ◽  
Aging Behavior ◽  
Scanning Calorimetry ◽  
Narrow Temperature Range ◽  
Glass Forming ◽  
Fast Scanning Calorimetry

The present work aims to provide insights on recent findings indicating the presence of multiple equilibration mechanisms in physical aging of glasses. To this aim, we have investigated a glass forming polyether, poly(1-4 cyclohexane di-methanol) (PCDM), by following the evolution of the enthalpic state during physical aging by fast scanning calorimetry (FSC). The main results of our study indicate that physical aging persists at temperatures way below the glass transition temperature and, in a narrow temperature range, is characterized by a two steps evolution of the enthalpic state. Altogether, our results indicate that the simple old-standing view of physical aging as triggered by the α relaxation does not hold true when aging is carried out deep in the glassy state.

Tacticity and surface chemistry effects on the glass transition temperature of thin supported PMMA films.

2000 ◽  
Vol 629 ◽  
Author(s):  
Y. Grohens ◽  
L. Hamon ◽  
P. Carriere ◽  
Y. Holl ◽  
J. Schultz
Keyword(s):  
Glass Transition ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
Surface Chemistry ◽  
Thin Layer ◽  
Methyl Methacrylate ◽  
Silicon Wafer ◽  
Interfacial Interactions ◽  
Opposite Trend ◽  
Chain Organization

ABSTRACTThe glass transition temperature (Tg) of thin supported films of stereoregular poly(methyl methacrylate) on silicon has been investigated by ellipsometry in temperature. The Tg of the spin coated layers of isotactic PMMA increases for thickness lower than 100 nm whereas a depression of the Tg is observed for the syndiotactic PMMA. This opposite trend in the Tg variation in thin layer between the two isomers evidenced a fascinating effect of the chain organization at an interacting interface. Hydrofluric acid surface etching of the silicon wafer was shown to decrease the threshold thickness at which the change in Tg occurs for both PMMA isomers. The influence of the interfacial interactions along with the tacticity dependent characteristics of the polymer will be discussed.

scholarly journals Physical aging of polycarbonate far below the glass transition temperature: Evidence for the diffusion mechanism

2004 ◽  
Vol 70 (22) ◽  
Author(s):  
D. Cangialosi ◽  
M. Wübbenhorst ◽  
J. Groenewold ◽  
E. Mendes ◽  
H. Schut ◽  
...  
Keyword(s):  
Glass Transition ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
Physical Aging ◽  
Diffusion Mechanism

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.

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