Density Measurements of Annealed Amorphous Polymers

1995 ◽  
Vol 60 (11) ◽  
pp. 1935-1940 ◽  
Author(s):  
František Lednický
Keyword(s):  
Glass Transition ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
Methyl Methacrylate ◽  
Density Measurement ◽  
Amorphous Polymers ◽  
Sufficient Accuracy ◽  
Density Measurements ◽  
Poly Methyl Methacrylate ◽  
Flotation Method

The flotation method of the density measurement was adapted to reach sufficient accuracy with which the differences due to annealing amorphous polymers above their glass transition temperature can be traced. The densities of amorphous poly(methyl methacrylate) and polystyrene increase logarithmically in the course of the annealing, which suggests that some arrangement or ordering takes place. However, the changes are not stable.

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

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.

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