Polymer, isocyanate

Although the crystalline poly(allyl isocyanate) polymers are reported to be stable, many of these polymers depolymerize upon heating to yield monomers and cyclic trimers. The level of temperature sensitivity is a strong function of the length of the side chain. Room temperature depolymerization occurs in polar solvents in the presence of an initiator. Interestingly, the solution properties of poly(alkyl isocyanates) display an unusual degree of chain stiffness which is attributed to their helical configuration (64). 

Isocyanatomethyl-dimethylmonomethoxy silane allows the derivatization of any polymer having groups susceptible to the reaction with isocyanates. Polymers like polyethers or polyesters can be used and formulated into RTV-2 systems. 

Chavbn, Sympoaum on Isocyanate Polymers, ACS Meeting, September, 1956. 

At present, the future of the isocyanate polymers appears to be one of the most promising in the chemical field. 

Majumdar, T.K., Eberlin, M.N., Cooks, R.G., Green, M.M., Munoz, B., and Reidy, M.P., Structural Studies on Alkyl isocyanate Polymers by Thermal Degradation Tandem Mass Spectrometry, /. Am. Soc. Mass Spectrom, 2, 130 (1991). 

Hexamethylene isocyanate polymer. See Hexamethylene diisocyanate polymer Hexamethylenetetraamine. See Hexamethylenetetramine Hexamethylenetetramine CAS 100-97-0 EINECS/ELINCS 202-905-8 UN 1328 (DOT) INS239 E239 Synonyms Aminoform Ammonioformaldehyde Hexa Hexamethylenamine ... 

There is several research stodies carried out that made use of palm oil for PU preparation (Chian Gan 1998 Tuan Noor Maznee et al. 2001). Palm oil consists of mainly triglycerides (Tri-Gs), thus, it is necessary to introduce hydroxyl groups to a molecule of Tri-G for urethane reaction (Badri 2012). PU which sometimes is also known as urethane or isocyanate polymer has once been of the most important segments in the polymer industry for decades (Healy 1963). The onset of urethane bond dissociation is somewhere between 150°C and 220°C, depending on the type of substituent the isocyanate and polyol. Saturated hydrocarbons are... 

The polyurethanes [126, 132] are sometimes also called isocyanate polymers. They are characterized by the urethane linkage. Other functional groups, however, may be present in the polymer as well. The urethane linkages can be produced in polymers by several different routes. Among these, the most common ones are through reactions of the isocyanate groups with compounds... 

LC methods using fluorescence detection, like most reported LC methods for the determination of isocyanates, have mainly been applied to monomer diisocyanates. In as much as they provide a different detector response for each isocyanate derivative, they require individual isocyanate standards for quantification. As a result, their application to polymeric forms is subject to some drawbacks shared by determinations of polymers using chromatographic procedures, viz., the lack of appropriate standard materials. In fact, such important data as pvu ity, the precise identity of the polymeric components, and the nature of the additives used in the isocyanate polymers available for calibration are often lacking. 

Isocyanurate plastic n. A plastic based on isocyanate polymers in which trimeriza-tion of the isocyanates incorporates six-membered isocyanurate-ring groups in a chain. Elias HG (1977) Macromolecules, vols 1-2, Plenum Press, New York. 

Mulik S, Sotiriou-Levetis C, Leventis N (2006) Acid-catalyzed time-efficient synthesis of resOTcinol-formaldehyde aerogels and crosslinking with isocyanates. Polym Preprints 47 364—365. 

G. P. Belonovskaya, L. S. Adrianova, Zh. D. Chernova, L. A. Korotneva, and B. A. Dolgoplosk, New Type of Mutually Penetrating Polymeric Reticular Systems, Dokl Akad. Nauk SSSR 212(3), 615 (1973). IPN based on isocyanate polymers. 

Utility lies in the preparation of lower aUcyl carbamoyl chlorides and the corresponding isocyanates. Exposure of these alkyl carbamoyl chlorides to the conditions of the solvent phosgenation procedure and conventional thermal dehydrohalogena-tion techniques leads to extensive degradation and yield losses due to the formation of by-products (aDophanoyl chlorides and isocyanate polymers). 

Aharoni, Sh.M. Walsh, E.K. (1979). Rigid backbone polymers. HI. Partitioning of isocyanate polymers between isotropac and anisotropic phases.. Polym. Sci. Polym. Lett Ed., Vol. 17, pp. 321-327. 

Moisture cured) Isocyanate group reacts with water to form an amine, which reacts with isocyanate polymers to form the film available in one-part container, limited pot life—moisture reacts with isocyanate in can used for cold weather apphcations, poor color and gloss retention strong performance properties as steel coatings. 

Poly(tolylene 2,4-diisocyanate-co-poly ( 1,4-butanediol)) Poly(tetramethylene ether glycol)-TDI copolymer polytetramethylene glycol-tolylene isocyanate polymer 9069-50-5 Poly(oxy-1,4-butanediyl), oo-hydro-w-hydroxy-, poljmier with 1,3-diisocyanatomethyl-benzene R (C9H6N202- (C4H80) H20),... 

Other Compounds. Horner and co-workers [129-131] have described the production of optically active phosphines and arsines in the cathodic cleavage of quaternary phosphonium and arsonium salts. This reaction, like its reverse quaternization reaction, takes place with retention of configuration. Shapoval, Skobets, and Markova [132, 133] have described the production of a. stereoregular isocyanate polymer during reduction at a nickel cathode in dimethyl-formamide. The formation of a stereoregular product evidently demonstrates the orienting effect of the electrode on the molecules of the monomer in the polymerization process. 

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