Depression of the Glass Transition Temperature in Ultra-Thin, Grafted Polystyrene Films

1994 ◽  
Vol 366 ◽  
Author(s):  
J. L. Keddie ◽  
R. A. L. Jones
Keyword(s):  
Thin Films ◽  
Glass Transition ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
Ultrathin Films ◽  
Native Oxide

ABSTRACTWe have used ellipsometry to measure the glass transition temperature (Tg) of ultrathin films of polystyrene (PS) (less than 10 nm thick) obtained by grafting PS-COOH on the native oxide of Si. We find that Tg in these ultra-thin films is depressed from the bulk value by as much as, 35 K. This is in qualitative accord with our earlier results on thicker non-grafted films of PS.

Impact of Surface-Modified Nanoparticles on Glass Transition Temperature and Elastic Modulus of Polymer Thin Films

2007 ◽  
Vol 40 (22) ◽  
pp. 7755-7757 ◽  
Author(s):  
Jong-Young Lee ◽  
Kristin E. Su ◽  
Edwin P. Chan ◽  
Qingling Zhang ◽  
Todd Emrick ◽  
...  
Keyword(s):  
Thin Films ◽  
Glass Transition ◽  
Elastic Modulus ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
Polymer Thin Films ◽  
Surface Modified ◽  
Surface Modified Nanoparticles

Variations in the glass transition temperature of polyester with special architectures confined in thin films

Polymer ◽  
2010 ◽  
Vol 51 (1) ◽  
pp. 129-135 ◽  
Author(s):  
M. Erber ◽  
A. Khalyavina ◽  
K.-J. Eichhorn ◽  
B.I. Voit
Keyword(s):  
Thin Films ◽  
Glass Transition ◽  
Transition Temperature ◽  
Glass Transition Temperature

scholarly journals Influence of grafting on the glass transition temperature of PS thin films

2017 ◽  
Vol 40 (1) ◽  
Author(s):  
Marceau Hénot ◽  
Alexis Chennevière ◽  
Eric Drockenmuller ◽  
Kenneth Shull ◽  
Liliane Léger ◽  
...  
Keyword(s):  
Thin Films ◽  
Glass Transition ◽  
Transition Temperature ◽  
Glass Transition Temperature

Glass Transition Temperature in Confined Polymers

2006 ◽  
Vol 977 ◽  
Author(s):  
Rahmi Ozisik ◽  
Tong Liu ◽  
Richard W. Siegel
Keyword(s):  
Thin Films ◽  
Glass Transition ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
Nearest Neighbor ◽  
Scanning Calorimetry ◽  
Thin Film Thickness ◽  
Confined Polymers ◽  
Microscope Images ◽  
Scanning Electron

AbstractGlass transition temperature of polyetherimide (PEI) thin films and nanoporous PEI samples was investigated using differential scanning calorimetry. In both of these systems, the glass transition temperature decreased with respect to the bulk value. In the nanoporous system, scanning electron microscope images were used to characterize pore size distribution, and Monte Carlo simulations were performed to calculate the nearest neighbor pore-to-pore distances. Pore-to-pore distances and thin film thickness values were used to establish a quantitative analogy between thin films and nanoporous system.

Electrical Properties of Polymer Composites

2005 ◽  
Vol 482 ◽  
pp. 391-394
Author(s):  
T. Podgrabinski ◽  
Petr Slepička ◽  
V. Rybka ◽  
Václav Švorčík
Keyword(s):  
Thin Films ◽  
Glass Transition ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
Electrical Properties ◽  
Hysteresis Loops ◽  
Temperature Hysteresis ◽  
Electrical Field ◽  
Measured Polarization ◽  
Pmma Solution

Permittivity of about 1 µm thin films prepared from polymethylmetactrylate (PMMA) solution doped with 20 % of diphenyl sulfoxide was studied. Permittivity of the films was measured as a function of the temperature. The measurement of the dependence of polarization on electrical field was performed using a standard Sawyer-Tower circuit. The presence of the dopant increases the composite permittivity namely above the PMMA glass transition temperature. Hysteresis loops observed on the measured polarization vs. electrical field dependence indicate easier and more pronounced polarizability of the composite comparing to pristine PMMA.

scholarly journals The Glass-Transition Temperature of Supported PMMA Thin Films with Hydrogen Bond/Plasmonic Interface

Polymers ◽  
2019 ◽  
Vol 11 (4) ◽  
pp. 601 ◽  
Author(s):  
Jiayao Chen ◽  
Jing Li ◽  
Lirong Xu ◽  
Wei Hong ◽  
Yuzhao Yang ◽  
...  
Keyword(s):  
Thin Films ◽  
Glass Transition ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
Surface Effect ◽  
Quartz Substrate ◽  
Dynamics Simulation ◽  
Enhanced Fluorescence ◽  
Polymeric Thin Film ◽  
Fluorescence Measurements

The interfacial effect is one of the significant factors in the glass-transition temperature (Tg) of the polymeric thin film system, competing against the free surface effect. Herein, the Tgs of poly (methyl methacrylate) (PMMA) films with different thicknesses and substrates are studied by fluorescence measurements, focusing on the influence of interfacial effects on the Tgs. The strong interaction between PMMA and quartz substrate leads to increased Tgs with the decreased thickness of the film. The plasmonic silver substrate causes enhanced fluorescence intensity near the interface, resulting in the delayed reduction of the Tgs with the increasing film thickness. Moreover, as a proof of the interface-dependent Tgs, hydrogen bonds of PMMA/quartz and molecules orientation of PMMA/silver are explored by the Raman spectroscopy, and the interfacial interaction energy is calculated by the molecular dynamics simulation. In this study, we probe the inter-relationship between the interfacial interactions arising from the different substrates and the Tg behavior of polymer thin films.

Glass transition of ion-containing polymer melts in bulk and thin films

Soft Matter ◽  
2021 ◽  
Vol 17 (37) ◽  
pp. 8420-8433 ◽  
Author(s):  
Wei Li ◽  
Monica Olvera de la Cruz
Keyword(s):  
Thin Films ◽  
Molecular Dynamics ◽  
Glass Transition ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
Molecular Dynamics Simulations ◽  
Polymer Melts ◽  
Transition Behavior ◽  
Dynamics Simulations

We investigate the glass transition behavior of ion-containing polymers via molecular dynamics simulations, revealing its coupling with ionic correlations as well as variations of the glass transition temperature in bulk and thin films.

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