Foamed polymers

Foamed polymers Foamed sheet Foamed silicone rubber Foam fractionation... 

Now for some real numbers. Table 3.1 is a ranked list of Young s modulus of materials - we will use it later in solving problems and in selecting materials for particular applications. Diamond is at the top, with a modulus of lOOOGPa soft rubbers and foamed polymers are at the bottom with moduli as low as 0.001 GPa. You can, of course, make special materials with lower moduli - jelly, for instance, has a modulus of about 10 GPa. Practical engineering materials lie in the range 10 to 10 GPa - a... 

In Eq. (10), is equilibrium volume of foamed polymer, VmeU is volume of thermoplastic melt at experimental temperature Tj Pf is foaming pressure. Other symbols are the same as in previous formulas. 

Shutov, F. A. Foamed Polymers Based on Reactive Oligomers, Vol. 39, pp. 1-64. 

Shimidzu, I. Cooperative Actions in the Nucleophile-Containing Polymers. Vol. 23, pp. 55-102. Shutov, F. A. Foamed Polymers Based on Reactive Oligomers, Vol. 39, pp. 1-64. 

Elastomers resulting from a series of organic reactions, e.g., a polyglycol ester of adipic acid reacted with an aromatic diisocyanate and cured with water, glycol or further reaction with an aromatic diisocyanate. These elastomers have high tensile strength, very high abrasion resistance, and lower hysteresis than natural rubber. A major use is in the manufacture of foamed polymers. 

Improved Oil Recovery (ior), where a range of more exotic fluids such as steam (hot water), caustic solutions, carbon dioxide, foams, polymers, surfactants, and so on are injected to improve recovery beyond what might be obtained by waterflooding alone. 

Japon, S., Leterrier, Y. and Manson, J.-A. E., Recycling of polyethylene terephthalate) into closed-cell foams, Polym. Eng. Sci., 40, 1942 (2000). 

Foamed polymers are low-density, cellular materials that contain bubbles of gas and are made in a variety of ways out of thermoplastics and thermosets. Their properties vary from rigid to flexible. The rigid foams are best known for their insulation properties (like in ice chests). The flexible foams are used extensively in cushioning (seats, mattresses). 

Foamed polymers. Thermosets and thermoplastics formed into low density, cellular materials containing bubbles of gas. Rigid foams have their gas bubbles in closed cells, inhibiting flexibility flexible foams have the bubbles in open cells, permitting the gas to escape as the foam is flexed. 

The density of the polymer clearly shows the formation of a foamed polymer. The density values for selected foams together with the polyimide homopolymers are shown in Table 11. The density values for the ODPA/FDA and PM-DA/FDA polyimides were both 1.28 g/cm and 3FDA/PMDA is 1.34, while most of the propylene oxide-based copolymers showed substantially lower values. The densities of the foamed copolymers derived from these copolymers ranged from 1.09 to 1.27 g/cm, which is 85-99 % of that of the polyimide homopolymers. This is consistent with 1-15 % of the film being occupied by voids. From these data (i.e., the comparison of Tables 10 and 11), it appears that the volume fraction of voids or the porosity is substantially less than the volume fraction of propylene oxide in the copolymer (i.e., 70 % or less). Thus the efficiency of foam formation is poor. Conversely, the propylene oxide-based copolymers with PMDA/ODA as the imide component did not show the expected density drop, and the values were essentially identical to that of the homopolymer. In PM-DA/ODA-based systems, molecular ordering and orientation were found to be critical in determining the stability of the foam structure. Where the character-... 

Hedrick JL, Di Pietro R, Plummer CJG, Hilborn J, Jerome R (1996) Polymer 37 5236 Charlier Y, Hedrick JL, Russel TP, Di Pietro R, Jerome R (1995) Polymer 36 4529 Hedrick JL, Charlier Y, Russel TP, Swanson S,SanchezM (1995) Polymer 36 1315 Hedrick JL, Di Pietro R, Charlier Y, Jerome R (1995) High performance polymers 7 133 Hedrick JL, Di Pietro R, Hawker C, Jerome R (1995) Polymer 36 4855 Hedrick JL, Labadie JW, Russel TP, Hofer D, Wakharkar V (1993) High temperature polymer foams. Polymer 34 4717... 

The use of crosslinked expanded EVA and other crosslinked foamed polymers in shoe soles is discussed, and developments by Main Group in injection moulding machines for the production of soles from such materials are examined. 

Journal of Vinyl and Additive Technology 6, No.l, March 2000, p.49-52 MOISTURE CROSSLINKING PROCESS FOR FOAMED POLYMERS... 

Diverse foam structure applications In foam rubber, foamed polymers, shaving foams, milk shakes, and whipped creams, slowly draining thin liquid films (TLF) are needed. Accordingly, the rate of drainage is the most important factor in such industrial foam applications. 

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