Methylene diisocyanate poly

Polyurethanes. Metal-containing polyurethanes have been synthesized by poly-condensing Co2+, Cu2+ salts of mono(hydroxyethyl) phthalate with hexa-methylene diisocyanate and tolylene diisocyanates [47] (Fig. 19). 

MC MDI MEKP MF MMA MPEG MPF NBR NDI NR OPET OPP OSA PA PAEK PAI PAN PB PBAN PBI PBN PBS PBT PC PCD PCT PCTFE PE PEC PEG PEI PEK PEN PES PET PF PFA PI PIBI PMDI PMMA PMP PO PP PPA PPC PPO PPS PPSU Methyl cellulose Methylene diphenylene diisocyanate Methyl ethyl ketone peroxide Melamine formaldehyde Methyl methacrylate Polyethylene glycol monomethyl ether Melamine-phenol-formaldehyde Nitrile butyl rubber Naphthalene diisocyanate Natural rubber Oriented polyethylene terephthalate Oriented polypropylene Olefin-modified styrene-acrylonitrile Polyamide Poly(aryl ether-ketone) Poly(amide-imide) Polyacrylonitrile Polybutylene Poly(butadiene-acrylonitrile) Polybenzimidazole Polybutylene naphthalate Poly(butadiene-styrene) Poly(butylene terephthalate) Polycarbonate Polycarbodiimide Poly(cyclohexylene-dimethylene terephthalate) Polychlorotrifluoroethylene Polyethylene Chlorinated polyethylene Poly(ethylene glycol) Poly(ether-imide) Poly(ether-ketone) Polyethylene naphthalate Polyether sulfone Polyethylene terephthalate Phenol-formaldehyde copolymer Perfluoroalkoxy resin Polyimide Poly(isobutylene), Butyl rubber Polymeric methylene diphenylene diisocyanate Poly(methyl methacrylate) Poly(methylpentene) Polyolefins Polypropylene Polyphthalamide Chlorinated polypropylene Poly(phenylene oxide) Poly(phenylene sulfide) Poly(phenylene sulfone)... 

Frere et al. have reported the synthesis and characterization of PU microcapsules containing water, by interfacial polycondensation using three different diols, viz. 1,5- pentane diol, poly(ethylene glycol)s (PEG 600, PEG 1500, PEG 4200), and two different isocyanates, viz. diphenyl methylene diisocyanate (MDl) and poly(hexa-methylene diisocyanate) [25]. The surfactant used is ABA block copolymer from... 

The interfacial interaction between poly(lactic acid) (PLA) and starch was improved and mechanical properties of PLA blends with starch were enhanced by an addition of methylene diisocyanate (MDI) [111-112]. 

Wang H., Sun X., Seib P. Strengthening blends of poly(lactic acid) and starch with methylene diisocyanate, J Polym. Sci. 82 (2001) 1761. 

The abbreviations and symbols are as follows MDI methylene diisocyanate, TDI toluene diisocyanate, HuMDI aliphatic MDI, [NCOJo initial isocyanate concentration, PEG poly(ethylene glycol), MW molecular weight, T temperature, k kinetic rate constant, E The Arrhenius activation energy, A pre-exponential factor. It is assumed that the reactions follow an Arrhenius relationship of k = Aexp(—E /PT). 

Biodegradable poly(phosphoester-urethanes) containing bisglycophosphite as the chain extender were synthesized. Methylene bis-4-phenyl isocyanate (MDI) and toluene diisocyanate (TDI) were initially used as diisocyanates. Since there was a concern that the degradation products could be toxic, the ethyl 2,6-diisocyanatohexanoate (LDI) was synthesized and replaced the MDI (or TDI). The hydrolytic stability and solubility of these polymers were tested. Preliminary release studies of 5-fluorouracil from MDI based poly(phosphoester-urethane) and methotrexate from LDI based poly(phosphoester-urethane) are also reported. 

Materials and Purification. Chemicals were purchased from Aldrich chemical company and used as received unless otherwise noted 1,1,1,3,3,3-hexamethyl disilazane, ethylene glycol, triphosgene, poly(ethylene oxide) (MW = 600), poly(tetramethylene oxide) (MW = 1000), poly(caprolactonediol) (MW = 530), toluene diisocyanate (TDI), anhydrous ethanol (Barker Analyzed), L-lysine monohydride (Sigma) and methylene bis-4-phenyl isocyanate (MDI) (Kodak). Ethyl ether (Barker Analyzer), triethylamine and dimethyl acetamide were respectively dried with sodium, calcium hydride and barium oxide overnight, and then distilled. Thionyl chloride and diethylphosphite were distilled before use. 

Commonly used isocyanates are toluene diisocyanate, methylene diphenyl isocyanate, and polymeric isocyanates. Polyols used are macroglycols based on either polyester or polyether. The former [polyethylene phthalate) or polyethylene 1,6-hexanedioate)] have hydroxyl groups that are free to react with the isocyanate. Most flexible foam is made from 80/20 toluene diisocyanate (which refers to the ratio of 2,4-toluene diisocyanate to 2,6-toluene diisocyanate). High-resilience foam contains about 80% 80/20 toluene diisocyanate and 20% poly(methylene diphenyl isocyanate), while semi-flexible foam is almost always 100% poly(methylene diphenyl isocyanate). Much of the latter reacts by trimerization to form isocyanurate rings. 

A synthetic approach to poly(ester-urethanes) was recently published by Xue et al. [48]. Glycerol was employed as a trifunctional initiator in the enzymatic ROP of CL. The three-arm PCL triol was then reacted with methylene-diphenyl diisocyanate (MDI) and hexanediol to yield a three-arm PCL-based poly(ester-urethane) with shape-memory properties. 

Two series of polyether polyurethanes (PU) based on hydroquinone bis (P-hydroxyethyl) ether (HQEE) or 1,4-butanediol (BDO) as a chain extender were prepared by the one step bulk polymerisation process. By varying the mole ratio of poly tetra methylene oxide (PTMO) extender (with Mn = 1000 and Mn = 2000) and 4,4 -diphenylene methane diisocyanate (MDI) the two series of HQEE (PUlOOOHj, PU 1000H2, PU2000Hj,... 

In the polyurethane industry, the polymeric glycols are prepared by anionic polymerization of epoxides such as ethylene oxide and propylene oxide. Poly(tetra-methylene glycol), which was prepared by polymerization of tetrahydrofuran, was subjected to chain extension by reaction with diisocyanate (polyurethane formation) and with dimethyl terephthalate (polyester by alcoholysis). 

The major poly isocyanates used (2) are toluene diisocyanate (TDI) and the less volatile 4,4/-methylene diphenylene diisocyanate (MDI), which, because it is a crystalline solid in the pure form, has to be used in a relatively crude form. The crude polyisocyanate is a mixture of MDI variants that is conveniently a liquid product with a mean functionality greater than 2. The use of a pure, liquid diisocyanate, however, would enable polyurethanes to be formed having relatively enhanced physical properties (2) and would also greatly simplify processing by removing the need to use elevated temperatures, solvents, or isocyanate prepolymers as with MDI. 

A Polyester and a Polyurethane. A segmented polyether-polyurethane sample (UET46-1) was synthesized in one step from 4-4 diphenyl methane diisocyanate, 1-4 butanediol and poly(tetra-methylene ether)glycol ... 

All chemicals used in this study were reagent grade. Butyl isocyanate (BuNCO, 99% from the Upjohn Chemical Co.), hexamethy-lene diisocyanate (HDI, 99% from the Mobay Chemical Co.), phenyl isocyanate (PhNCO, 99%, from the Upjohn Chemical Co.), p-tolyl isocyanate (MePhNCO, 99% from the Aldrich Chmical Co.), p-chloro-phenyl isocyanate (CIPhNCO, 99%, from the Aldrich Chemical Co.) and cyclohexyl isocyanate (CHI, 98%, from the Aldrich Chemical Co.) were purified by vacuum distillation. Methylene diphenyl diisocyanate (MDI, 99%+, from the Mobay Chemical Co.) was used without further purification. N,N-Dimethylformamide (DMF, reagent grade, from the Mallinckrodt) was dried by molecular sieves 4a. The NCO-terminated prepolymers were prepared from poly(oxy-tetramethylenediol) (POTMD, mol. wt. 650, 1000, 2000, Quaker Oats Chem. Co.) and MDI. 

Methylene diphenyl diisocyanate (MDI) Poly(tetramethylene glycol) (PTMO) CHg... 

Poly (melamine-co-formaldehyde), methylated. See Melamine-formaldehyde resin, methylated Poly (melamine-co-formaldehyde), methylated/butylated. See Melamine-formaldehyde resin, methylated-butylated Polymene AZ. See PEG castor oil Polymer C . See Polypropylene Polymer SBOCP. See Cocamidopropyl dimethylammonium C8-16 isoalkylsuccinyl lactoglobulin sulfonate Polymer Additive GH. See Polyoxyisobutylene/methylene urea copolymer Polymeric biuret of HDI Polymeric HDI Polymeric HMDI. See Hexamethylene diisocyanate biuret Polymeric MDI... 

Dinitrotoluene Hexamethylene diisocyanate Methylene bis (4-cyclohexylisocyanate) Toluene-2,4-diisocyanate Toluene-2,6-diisocyanate elastomer mfg., abrasive wheels Toluene diisocyanate elastomer mfg., adhesives Toluene diisocyanate elastomer mfg., cast Poly (diethylene adipate) polyester elastomer mfg., film Toluene diisocyanate elastomer mfg., high strength Bitoluene diisocyanate elastomer mfg., linings Toluene diisocyanate elastomer mfg., mechanical items Toluene diisocyanate... 

Tian XY, Yao J, Zhang X, Li M, Liu W, Qiao C, et al. New optically active poly(amide-imide)s based on n,n -(pyromellitoyl)-bis-L-amino acid and methylene diphenyl-4,4 -diisocyanate synthesis and characterization. Des Monomers Polym 2014 17(3) 201-7. 

In other applications, Baysal utilized methylene dicyclohexyl isocyanate to link polybutadiene with polystyrene or poly(methyl methacrylate) to form the appropriate block copolymers(70). Diphenyl methane-4,4 diisocyanate was similarly used to prepare a block... 

In a 250 ml plastic beaker 10 g of a strongly branched polyester with a high OH number of about 350-370 (see Example 4.1b or commercial sample, e.g., Desmophen 4070 X from Bayer AG) and 15 g of methylene di(phenylisocyanate) (technical product, liquid mixture of the diisocyanate with poly-MDl, e.g.. 

A commercial grade of high-impact (notched Izod > 900 J/m) POM resin (Delrin 100 ST, DuPont) is believed to be a blend of POM with >30 wt% of a thermoplastic poly(ester-urethane) elastomer derived from poly(l, 4-butane adipate) diol and methylene-bis-(4,4 -diphenyl diisocyanate) (MDl) (Hexman 1989). This blend is reported to have a cocontinuous or semi-interpenetrating network of the elastomer in a matrix of the polyacetal (Flexman et al. 1990). The toughening effect in such a blend of IPN-type morphology was interpreted to occur partly through a rubber band mechanism by which the fracture energy is absorbed. The bands of rubbery domains were believed to span the crack and participate in the deformation process. 

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