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 Effects of Residual Solvent on Glass Transition Temperature of Poly(methyl methacrylate)

2018 ◽  
Vol 46 (3) ◽  
pp. 117-121 ◽  
Author(s):  
Asae Ito ◽  
Viknasvarri Ayerdurai ◽  
Azusa Miyagawa ◽  
Akikazu Matsumoto ◽  
Haruki Okada ◽  
...  
Keyword(s):  
Glass Transition ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
Methyl Methacrylate ◽  
Residual Solvent ◽  
Poly Methyl Methacrylate

Enhancement of the glass transition temperature of poly(methyl methacrylate) by salt

2018 ◽  
Vol 50 (9) ◽  
pp. 857-863 ◽  
Author(s):  
Asae Ito ◽  
Panitha Phulkerd ◽  
Viknasvarri Ayerdurai ◽  
Mizuki Soga ◽  
Antoine Courtoux ◽  
...  
Keyword(s):  
Glass Transition ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
Methyl Methacrylate ◽  
Poly Methyl Methacrylate

Effects of sequence length distribution on heat capacity and glass transition temperature of styrene—methyl methacrylate copolymers

Polymer ◽  
1994 ◽  
Vol 35 (17) ◽  
pp. 3698-3702 ◽  
Author(s):  
Hidematsu Suzuki ◽  
Yoshiyuki Nishio ◽  
Noritaka Kimura ◽  
V.B.F. Mathot ◽  
M.F.J. Pijpers ◽  
...  
Keyword(s):  
Heat Capacity ◽  
Glass Transition ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
Methyl Methacrylate ◽  
Length Distribution ◽  
Sequence Length ◽  
Methacrylate Copolymers

Large Strain Mechanical Behavior of Poly(methyl methacrylate) (PMMA) Near the Glass Transition Temperature

2006 ◽  
Vol 128 (4) ◽  
pp. 559-563 ◽  
Author(s):  
G. Palm ◽  
R. B. Dupaix ◽  
J. Castro
Keyword(s):  
Glass Transition ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
Methyl Methacrylate ◽  
Mechanical Behavior ◽  
Strain Hardening ◽  
Uniaxial Compression ◽  
Large Strain ◽  
Strain Rates ◽  
Poly Methyl Methacrylate

The mechanical behavior of amorphous thermoplastics, such as poly(methyl methacrylate) (PMMA), strongly depends on temperature and strain rate. Understanding these dependencies is critical for many polymer processing applications and, in particular, for those occurring near the glass transition temperature, such as hot embossing. In this study, the large strain mechanical behavior of PMMA is investigated using uniaxial compression tests at varying temperatures and strain rates. In this study we capture the temperature and rate of deformation dependence of PMMA, and results correlate well to previous experimental work found in the literature for similar temperatures and strain rates. A three-dimensional constitutive model previously used to describe the mechanical behavior of another amorphous polymer, poly(ethylene terephthalate)-glycol (PETG), is applied to model the observed behavior of PMMA. A comparison with the experimental results reveals that the model is able to successfully capture the observed stress-strain behavior of PMMA, including the initial elastic modulus, flow stress, initial strain hardening, and final dramatic strain hardening behavior in uniaxial compression near the glass transition temperature.

Sign in / Sign up

Export Citation Format

Share Document