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.

Synthesis and Gas Transport Properties of New High Glass Transition Temperature Ring-Opened Polynorbornenes

2002 ◽  
Vol 35 (12) ◽  
pp. 4677-4684 ◽  
Author(s):  
Armando Pineda Contreras ◽  
Mikhail A. Tlenkopatchev ◽  
Maria del Mar López-González ◽  
Evaristo Riande
Keyword(s):  
Glass Transition ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
Transport Properties ◽  
Gas Transport ◽  
High Glass Transition Temperature ◽  
Gas Transport Properties

scholarly journals Glass transition temperature from the chemical structure of conjugated polymers

2020 ◽  
Vol 11 (1) ◽  
Author(s):  
Renxuan Xie ◽  
Albree R. Weisen ◽  
Youngmin Lee ◽  
Melissa A. Aplan ◽  
Abigail M. Fenton ◽  
...  
Keyword(s):  
Glass Transition ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
Conjugated Polymers ◽  
Chemical Structure

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.

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