Polyamides, aromatic

The reverse reaction is an intramolecular acidolysis of amide group by the o-carboxyhc acid to reform anhydride and amine. This unique feature is the result of an ortho neighboring effect. In contrast, the acylation of an amine with ben2oic anhydride is an irreversible reaction under the same reaction conditions. The poly(amic acid) stmcture (8) can be considered as a class of polyamides. Aromatic polyamides that lack ortho carboxylic groups are very... 

Polyalkylarylsilanes, solid-state studies, 3, 605 Poly[(alkyl)(aryl)silylene]s, preferential screw sense, 3, 616 Polyamides, aromatic, 7t-complexed, 12, 362 Polyamidoferrocenylalkylthiolate—gold nanoparticles, synthesis, 6, 195—196... 

An example of how ab initio calculations may be applied to the study of fragments of polymer chains is given by Jaffe, Yoon, and McLean, who studied a series of mono- and diphenyl molecules containing up to 35 atoms. These compounds are models for a variety of important polymers such as polycarbonates (see Figure 1), polyimides, aromatic polyamides, aromatic polyesters, and polyether sulfone. A variety of basis sets, representing linear combination of Gaussian functions to approximate Slater-type orbitals (STOs) as compiled in Table 1, were employed. 

Polyacrylonitrile (PAN) PAN-Polyvlnylchlorlde Copolymer PAN-Methallyl Sulfonate Copolymer Polyamide (aromatic)... 

Polyamides, aromatic amines, cylcoaliphatic amines, reactive diluents, and specialty epoxy resins, which are used as performance additives in epoxy formulations... 

Nylon is a polyamide. Aromatic polyamides are called aramides. Dacron is a polyester. Polycarbonates are polyesters with two ester groups bonded to the same carbon. A urethane is a compound that has an ester and an amide group bonded to the same carbon. 

Amines 1. Enhaneement of axisymmetrie fiber strength 2. Fiber wettability enhaneement 3. Enhaneement of fiber adhesion 4. Stimulation of fiber s antistatie properties Aromatic polyamides Aromatic polyamides Aromatic polyamides Aromatic polyamides... 

J. Preston. Polyamides, aromatic. In H. F. Mark, N. Bikales, C. G. Overberg-er, and G. Menges, editors. Encyclopedia of Polymer Science and Engineering, volume 11, pages 381-409. Wiley Interscience, New York, 2nd edition, 1988. 

TRADE NAME, ALTERNATIVE NAMES Ultramid T (BASF), nylon 6/6T, polyphthalamide CLASS Aromatic polyamides aromatic nylon... 

ACRONYM, ALTERNATIVE NAME, TRADE NAME PPA, polyphthalamide, Amodel (Amoco) CLASS Aromatic polyamides aromatic nylons... 

Nylon 6 copolymer Nylon 6,6 Nylon 6,10 Nylon 6,12 Nylon 11 Nylon 12 Nylon MXD6 Polyamides, aromatic Keylar... 

Preston, J., Polyamides, aromatic, in Encyclopedia of Polymer Science and Technology, 2nd ed., Wiley Intersdence, New York, 1988. 

Chemical treatment consists of three weU-known treatment processes for ensuring rehable operation of RO membranes. First, a 20% sodium bisulphite (SBS) solution is injected by the chemical dosing pump (one pump is on standby). The iiyection rate is proportional to the RO feed water flow rate and is controlled by the PLC based on the chlorine concentration monitored by a chlorine analyser downstream of the in-line mixer. SBS like sodium sulphite and sodium metabisulphite is a reducing agent commonly used to dechlorinate RO feed or lower the chlorine concentration to less than 0.05 mg/1 in RO plants that use polyamide aromatic membranes. It takes 7.33 mg/1 of 20% NaHS03 solution to remove 1 ppm of residual chlorine in water on a stoichiometric basis. 

Preston J. Polyamides, aromatic. In Mark HE, Bikales N, Overberger CG, Menges G, editors. Encyclopedia of polymer science and engineering, vol. 11. 2nd ed. New York Wiley Interscience 1988. p. 381 09. 

Melt glues are amorphous and/or partially crystalline polymers above their glass transition temperatures or melt temperatures. Their viscosities should not be too high so that they can wet surfaces well, and not too low so that they do not flow away from where they are applied. Best results are obtained for viscosities of about 10-1 000 Pa s. Poly(ethylenes), poly(ethylene-co-vinyl acetate), poly(vinyl butyrals), versamides, polyamides, aromatic copolyesters, polyurethanes, bitumens, and asphalts, for example, are used as melt glues. The adhesive effect is produced by solidification of the melt glue. 

The primary chemical classes from which adhesives are made include epoxies, acrylics, phenolics, urethanes, natural and synthetic elastomers, amino resins, silicones, polyesters, polyamides, aromatic polyheterocyclics, and the various natural products such as carbohydrates and their derivatives as well as plant- and animal-based proteins. Chemical class was once a relatively clean differentiator of adhesives, but so many adhesives now are hybrids, designed to take advantage of specific attributes of more than one chemical class or type of material. Hybridization can be accomplished by incorporating into an adhesive a nonreactive resin of a different chemical class adding another type of reactive monomer, oligomer,... 

Perfluorinated Polymers, Polytetrafluoroethylene Polyamides, Aromatic Polyamides, Plastics Polyarylates Poly(arylene sufide)s Polycarbonates Cyclohexanedimethanol Polyesters Polyesters, Main Chain Aromatic Polyesters, Thermoplastic Polyethers, Aromatic Poly(ethylene naph-thanoate) Polyimides Polyketones Poly(phenylene ether) Polysulfones Poly(trimethylene terephthalate) Rigid Rod Polymers Syndiotactic Polystyrene . 

Rigid-rod polymers are often liquid crystalline polymers classified as lyotropic, such as the aramid Kevlar (DuPont), or thermotropic liquid crystalline polymers, such as Vectran (Celanese) (see Polyamides, Aromatic Liquid Crystalline Polymers, Main-Chain Liquid Crystalline Thermosets). 

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