Poly heat stable

Phycotoxins accumulate in fish and shellfish because of the natural feeding habits of the respective organisms, rather than because of food handling or processing practices. The toxins causing the diseases discussed in this chapter are heat stable (Australia New Zealand Food Authority, 2001 Committee on Evaluation of the Safety of Fishery Products, 1991). Complete inactivation of saxitoxin (associated with PSP) requires at least ten minutes of exposure to 260°C dry heat. Brevetoxins (associated with NSP) were inactivated (i.e., to levels below the limit of assay detection using Japanese medaka [Oryzias latipes]) by exposure to 500°C heat for 10 to 15 minutes (Poli, 1988). Complete inactivation required 10 minutes exposure to 2760°C dry heat (Wannamacher, 2000). 

FR 2236887 (French) 1975 Poly( ether imides) General Electric DR Heath, JGWirth Moldable, heat-stable polyim-ide-siloxanes... 

The internal structure of the cross-linked synthetic polypeptides is maintained by heat-stable, covalent bonding between the cross-linked amino acid side chains and by heat-labile, noncovalent side chain interactions between glutamic acid and lysine residues (electrostatic) and between tyrosine residues (nonpolar). The stability of the spatial structure of a polymer depends upon the relative proportion of covalent and noncovalent bonding that it contains and increases as the number of cross-links increases. According to the current theories of protein structure, the charged amino acid residues would be arrayed on the surface of the molecule, and the tyrosine residues would be internally placed and thus interact to give a hypochromic effect. Am(6)-poly Glu52Lys33Tyr15 (No. 3B) (Fr. 1) displays such an effect, and the molar extinction coefficient of the cross-linked derivative is 25% lower than that of the parent polymer. This hypo-... 

Irradiation at 240 0, and at reduced pressure, of 1,4-dimaleimidobenzene affords 50% yields of poly-bismaleimides, which remain unaffected by temperatures as high as 600°C (Ivanov Russian Patent 164,678). Similarly, heating of 4,4 -dimaleimidodiphenyl-methane affords polymers which are heat stable to 460°C. These infusible and Intractable products suffer from extreme brittleness, which severely restricts their practical utility (Sambeth Grundschober ... 

Mallakpour S, Zadehnazari A. Synthesis and characterization of novel heat stable and pro-cessable optically active poly(amide-imide) nanostructures bearing hydroxyl pendant group in an ionic green medium. J Polym Environ 2013 21(1) 132. ... 

Poly(ethylene) can be chlorinated in bulk (e.g., in a fluidized bed), solution (e.g., in CCU), emulsion, or suspension. A chlorine source and free-radical-forming agents are used. Products with 25%-40% chlorine are rubberlike, since the irregular substitution reduces the crystallinity. Products of high chlorine content are similar to PVC, and consequently they are described by some companies as heat-stable poly(vinyl chloride). These products are added to poly (vinyl chloride) to improve impact strength or they are used for hot water pressure tubing. 

Poly(ethylene oxide) decomposes upon heating at lower temperatures than does polyethylene. Among the volatile products are found formaldehyde, ethanol, ethylene oxide, carbon dioxide, and water. Polyipropylene oxide) is also less heat stable than polypropylene. Isotactic poly(propylene oxide) is somewhat more stable than the atactic one. 

Because of their smaller particle size (50-500 nm), emulsion poly-merizates assimilate plasticizer more quickly than do suspension poly-merizates (75-150 jam). Emulsion polymerizates are also more heat stable, since they contain smaller quantities of substances added as polymerization aids (alkali and phosphate) than do the suspension polymerizates. On the other hand, the higher cost and the tendency toward discoloration due to residual emulsifier impurity are both disadvantageous. Because of smaller quantities of polar groups (from emulsifier), suspension polymerizates possess better electrical properties than do emulsion polymerizates. 

Endotoxins are produced primarily by gramnegative bacteria. They act as antigens, are firmly bound to the bacterial cell wall and are complex in nature. They have protein, poly-saccharide and lipid components. Endotoxins are relatively heat stable and are in general active without a latent period. The toxins causing typhoid and paratyphoid fevers, salmonellosis and bacterial dysentery are in this group. Salmonellosis is very serious. It is an infection by toxins of about 300 different but closely related organisms. The infec-... 

Chem. Analysis 1% mono ester, 99% di, tri, poly ester CAS 25339-99-5 EINECS/ELINCS 246-873-3 Uses Emulsifier for cosmetics and personal care Features Yields heat-stable emulsions Properties Liq. HLB 1 Environmental Environmentally friendly Surfhope SE COSME C-1205 [Mitsubishi-Kagaku Foods]... 

Chem. Analysis 80% mono ester, 20% di, tri, poly ester CAS 26446-38-8 EINECS/ELINCS 247-706-7 Uses Emulsifier for cosmetics and personal care Features Yields heat-stable emulsions Properties Powd. HLB 16 Environmental Environmentally friendly Surfhope SE COSME C-1800 [Mitsubishi-Kagaku Foods] Chem. Descrip. Sucrose stearate Ionic Nature Nonionic Chem. Analysis 100% di, tri, poly ester CAS 25168-734 EINECS/ELINCS 246-705-9 Uses Emulsifier for cosmetics and personal care Features Yields heat-stable emulsions Properties Powd. HLB < 1 Environmental Environmentally friendly Surfhope SE COSME C-1801 [Mitsubishi-Kagaku Foods] Chem. Descrip. Sucrose stearate Ionic Nature Nonionic... 

Chem. Analysis 20% monoester 80% dl-, tri-, and poly-ester Uses Emulsifier for cosmetics and personal care Featums Yields emulsions which are exceptionally heat stable Pmperties Pellet HLB 3.0 Toxicology Mild... 

Vinylidene Chloride Copolymer Latex. Vinyhdene chloride polymers are often made in emulsion, but usuaUy are isolated, dried, and used as conventional resins. Stable latices have been prepared and can be used direcdy for coatings (171—176). The principal apphcations for these materials are as barrier coatings on paper products and, more recently, on plastic films. The heat-seal characteristics of VDC copolymer coatings are equaUy valuable in many apphcations. They are also used as binders for paints and nonwoven fabrics (177). The use of special VDC copolymer latices for barrier laminating adhesives is growing, and the use of vinyhdene chloride copolymers in flame-resistant carpet backing is weU known (178—181). VDC latices can also be used to coat poly(ethylene terephthalate) (PET) bottles to retain carbon dioxide (182). 

Xanthene Dyes. This class is best represented by Rhodamine B. It has high fluorescent brilliance but poor light and heat stabihty it may be used in phenohcs. Sulfo Rhodamine is stable and is useflil in nylon-6,6. Other xanthenes used in acryhcs, polystyrene, and rigid poly(vinyl chloride) are Solvent Green 4, Acid Red 52, Basic Red 1, and Solvent Orange 63 (see Xanthene dyes). 

Siloxane containing polyester, poly(alkylene oxide) and polystyrene type copolymers have been used to improve the heat resistance, lubricity and flow properties of epoxy resin powder coatings 43). Thermally stable polyester-polysiloxane segmented copolymers have been shown to improve the flow, antifriction properties and scratch resistance of acrylic based auto repair lacquers 408). Organohydroxy-terminated siloxanes are also effective internal mold release agents in polyurethane reaction injection molding processes 409). 

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