As it is observed, in PDMS membranes as rubbery polymers
, selectivity of larger gases over smaller gases increases with enhancement of feed pressure.
Diffusion coefficients of rubbery polymer
materials decrease with increasing molecular size.
At rubbery polymer
of PDMS in comparison with glassy polymer of PES, penetrant solubility coefficient is more important than diffusion coefficient.
The distribution of strands, p(n), in an unfilled rubbery polymer
is characterized by a relatively small standard deviation [[SIGMA].
Conversely, addition of a rubbery polymer
such as the EO copolymer decreases the stiffness but increases the elongation at break and provides improved impact resistance.
0] = Position of the front between glassy and rubbery polymer
Topics of the 17 papers include glassy and rubbery polymers
, highly permeable polymers, glassy polymers, substituted polyacetylenes, perfluoropolymers, polyimides, zeolite membranes, carbon membranes, polymer membranes for organic liquids, solid-state facilitated transport membranes for the separation of olefins/paraffins and oxygen/nitrogen, using a unified approach to membrane permeation using a solution-diffusion model, and using such methods as positron annihilation lifetime spectroscopy for free volume evaluation in polymers.
Polymers and other organic materials are typically much more compliant compared to the metallic and ceramic types of materials to which instrumented indentation mainly has been applied, with modulus values ranging from a few GPa for common glassy polymers to a few MPa or lower for rubbery polymers
and many biological materials.
Biomed structures Chemists synthesized new gelatinous and rubbery polymers
that may serve as superior dressings for wounds (162: 20) and as scaffolds for artificial organs and tissues (161: 323,408; 162: 93).
And rubbery polymers
, while robust, have so far performed poorly as carriers of current.
The amine functionalized rubbery polymers
can be utilized in tire tread rubbers where the rubbery polymers
may provide desirable wear properties without substantially sacrificing other performance characteristic(s), e.
Since polyurethanes chains easily form hydrogen bond, these polymers can be very crystalline, so they are frequently used to compose block copolymers (having the properties of thermoplastic elastomers) with soft rubbery polymers