Gas permeation through glassy polymer membranes with relatively low glass-transition temperature

1993 ◽  
Vol 10 (1) ◽  
pp. 44-48 ◽  
Author(s):  
Seong-Youl Bae ◽  
Du-Hyon Cho ◽  
Sang-Wook Ko ◽  
Hee-Taik Kim ◽  
Hidehiro Kumazawa
Keyword(s):  
Glass Transition ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
Glassy Polymer ◽  
Polymer Membranes ◽  
Gas Permeation

Tissue Scaffold Engineering by Micro-Stamping

2014 ◽  
Vol 1626 ◽  
Author(s):  
Eric C. Schmitt ◽  
Robert D. White ◽  
Amrit Sagar ◽  
Thomas P. James
Keyword(s):  
Tissue Engineering ◽  
Glass Transition ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
Room Temperature ◽  
Polymer Membranes ◽  
Tissue Scaffold ◽  
Brittle Behavior ◽  
Excessive Strain ◽  
Hot Melt

ABSTRACTA hand operated benchtop stamping press was developed to conduct research on microscale hole fabrication in polymer membranes for applications as scaffolds in tissue engineering. A biocompatible and biodegradable polymer, poly(ε-caprolactone), was selected for micropunching. Membranes between 30 μm and 50 μm thick were fabricated by hot melt extrusion, but could not be stamped with a 200 μm circular punch at room temperature, regardless of die clearance due to excessive strain to fracture. This problem was overcome by cooling the membrane and die sets with liquid nitrogen to take advantage of induced brittle behavior below the polymer’s glass transition temperature. While cooled, 203 μm hole patterns were successfully punched in 33 μm thick poly(ε-caprolactone) membranes with 11% die clearance, achieving 71% porosity.

Effect of polymers chemical structure on the membrane characteristics

2016 ◽  
Vol 30 (1) ◽  
pp. 58-66 ◽  
Author(s):  
Inga A Ronova ◽  
Svetlana V Kryuchkova ◽  
Marina Y Yablokova ◽  
Alexander Y Alentiev ◽  
Lyudmila G Gasanova ◽  
...  
Keyword(s):  
Glass Transition ◽  
Comparative Analysis ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
Permeability Coefficient ◽  
Chemical Structure ◽  
Gas Transport ◽  
Polymer Membranes ◽  
Gas Transport Properties ◽  
Methylene Group

The comparative analysis of gas transport properties and conformational parameters of membranes obtained from two polyimides and polysulfone was made. It was shown that the introduction of a sulfone group instead of a methylene group in the amine component of polyimide leads to an increase in glass transition temperature and of polymer membrane permeability coefficient and a reduction in selectivity. Also it was demonstrated that the solvent used during the preparation of polymer membranes had a significant influence on their gas transport characteristics.

Mechanics and nanovoid nucleation dynamics: effects of polar functionality in glassy polymer networks

Soft Matter ◽  
2018 ◽  
Vol 14 (44) ◽  
pp. 8895-8911 ◽  
Author(s):  
Robert M. Elder ◽  
Tyler R. Long ◽  
Erich D. Bain ◽  
Joseph L. Lenhart ◽  
Timothy W. Sirk
Keyword(s):  
Fracture Toughness ◽  
Glass Transition ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
Glassy Polymer ◽  
Polymer Networks ◽  
Molecular Simulations ◽  
High Glass Transition Temperature

We use molecular simulations and experiments to rationalize the properties of a class of networks based on dicyclopentadiene (DCPD), a polymer with excellent fracture toughness and a high glass transition temperature (Tg), copolymerized with 5-norbornene-2-methanol (NBOH).

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