Isocyanate-bonded

Vick, C.B., Krzysik, A. and Wood, J.E. (1991). Acetylated isocyanate-bonded flakeboards after accelerated aging. Dimensional stabihty and mechanical properties. Holz als Roh- und Werkstoff, 49(6), 221-228. 

At failure, weight losses averaged 7 8 percent for T. palustris and 31.6 percent for T. versicolor. Isocyanate-bonded control... 

Mycelium fully covered the surfaces of isocyanate-bonded control flakeboards within 1 week, but mycelial development was significantly slower in phenol-formaldehyde-bonded control flakeboards. Both isocyanate- and phenol-formaldehyde-bonded acetylated flakeboards showed surface mycelium colonization during the test time, but the fungus did not attack the acetylated flakes, so little strength was lost. 

Polyisocynanurate Polymer hydrolytic stability, mechanical properties, and cost advantages. A polymer containing multiple isocyanate-to-isocyanate bonds. A material consisting of molecules characterized by the repetition of one or more types of chemical units (poly = many, mer from monomer, mono = one). 

The ease with which the tetrahalides dissociate thermally increases rapidly in the series from tetrafluoride to tetraiodide. While the chlorine-silicon bond ordinarily is not considered mobile, it undergoes an interesting redistribution reaction with the isocyanate bond in the preparation of chloroisocyanates of silicon.18... 

The production of enzyme-lignin-bonded particleboard is much less hazardous than the production of isocyanate-bonded particleboard, for example. 

The efficiency of chiral stationary phase (CSP) is crucial in chromatographic technique. Recently, a new p-cyclodextrin phenyl isocyanate bonded chiral stationary phase (CSP) was developed. This CSP is quite stable and can be used in most of HPLC solvents. Many drug enantiomers that do not have enantioseparation effect on native P-cyclodextrin column in reversed phase were separated very well on this new CSP. 

Acetyl- and isocyanate-bonded chemicals did not stabilize the components degrading at 325 °C, but showed the same thermogra-vimetric and evolved gas analysis profiles as did the controls. Because ester and urethane bonds are not as stable toward pyrolysis as ether linkages at high temperatures, there was a partial release of bonded chemical at low temperatures (117). 

In a study concerned with the decay resistance provided by isocyanate bonding to wood, the distribution of the methyl isocyanate reaction in southern pine showed that 60% of the lignin hydroxyls and 12% of the holocellulose hydroxyls are substituted at the point where resistance to biological attack occurs. Therefore, it can be surmised that the chemical bonding of wood by isocyanates through the urethane link can contribute significantly to the excellent performance of diphenylmethane-diisocyanate X or polymeric isocyanates XI as adhesive binder in particle boards (24, 25). 

The influence of the support is undoubted and spillover was further confirmed by the excess of hydrogen chemisorbed by a mechanical mixture of unsupported alloy and TJ-A1203 above that calculated from the known values for the separate components. It was also observed that the chemisorption was slower on the supported than on the unsupported metal and that the greater part of the adsorbate was held reversibly no comment could be made on the possible mediation by traces of water. On the other hand, spillover from platinum-rhenium onto alumina appears to be inhibited for ratios Re/(Pt Re) > 0.6. In an infrared investigation of isocyanate complexes formed between nitric oxide and carbon monoxide, on the surface of rhodium-titania and rhodium-silica catalysts, it seems that the number of complexes exceeded the number of rhodium surface atoms.The supports have a pronounced effect on the location of the isocyanate bond and on the stability of the complexes, with some suggestion of spillover. 

Parti cel board contains between 6-8 wt% UFR (2,3). In 1984 the annual production of UF-bonded particleboard was 5.5 million cubic meters (3.1 billion square feet on a 3/4 inch base) in the U.S. alone. 70% of this board was used in furniture, cabinet construction and fixtures 20% was used in conventional home construction, and 10% in the manufacture of mobile homes. According to industry sources(, in the fall of 1985 90% of the total annual production was capaole of meeting the 0.3 ppm air chamber limit set by HUD for manufactured housing stock (5). The production of UF-bonded particleboard involved 48 plants in the US. Only two plants made phenolic particleboard and only one plant produced isocyanate bonded parti cel board. 

The potential energy curves derived from the angular vibration of both metal-0 (alcohol) and metal-jj (isocyanate) bonds... 

A non-concerted rearrangement can be anticipated (Fig. 4) after complexation there is formation of an oxygen (ROralcohol)-carbon(isocyanate) bond together with a donor-type bond between nitrogen and metal (via Py) the latter bond would then hydrolyzed by the proton (from alcohol) already present around the coordination sphere of the metal. 

Late in the 1960s, it became apparent that catalyzed lacquers, the hardest, most durable nitrocellulose lacquers commercially available for coating wood, had less resistance to alcohol, cosmetics, and chemicals than did the best quality alkyd-amine compositions or high-pressure melamine overlays. This situation was soon remedied by the development of nitrocellulose-urethane "super lacquers" based on nitrocellulose-isocyanate prepolymers (16). Nitrocellulose as manufactured contains free hydroxyl groups that can provide sites for true cross-linking with an isocyanate-bonded homogeneous coating. Laboratory studies confirmed the theoretical reaction ... 

U.S. Pat. No. 4,376,144 [60] discloses a thermoplastic composite in which cellulose hber (hardwood pulp, from 1 to 40% by weight) is attached to the PVC matrix with an isocyanate bonding agent (a cyclic trimer of toluene diisocyanate). 

Isocyanate bonding agent, 85 Isonox 129, 546-548 Isotactic, 57, 59, 67 Isothermal operation, 575 Isotropic plastics, 56 Izod impact resistance, 70... 

Fig. 3 shows the build up in viscosity that occurs as Polymer I is prepared. As the stoiometric amount of diisocyanate is reached the viscosity change ends and the characteristic isocyanate bond at 2250 cm"l is observed in the infrared spectrum. 

Platinum compounds yield various kinds of carbene complexes [118-137]. For example, if isocyanate platinum compounds react with alcohols or amines, the carbon of the isocyanate bonds to the hetero atom to afford the reactive CXY (X and Y are hetero atoms) group, and the carbene complex yields as shown in eqs. (21.44) [119,127] and (21.45) [120]. On the other hand, as shown in eq. (21.46) [121], the platinum carbene complexes are also obtained by the reaction of cyclic XYC = CXY with platinum compounds on heating for a long time. In these carbene complexes, the cw-isomer is more stable than the /ra/75-isomer as shown in eq. (21.47), the rra/j5-isomers being isomerized to the m-isomer at around 200 C [125]. The Pt-C bond length of these carbene eomplexes is about 2.00 A slightly shorter than 2.16 A, the sum of the covalent radii of the Pt-C bond (Pt= 1.39 A, C = 0.77A). 

Isocyanate bonded pine needle composites were investigated for their dimensional stability, flammability characteristics, biological resistance, and thermoacoustic properties (Chauhan et al. 2012). Chauhan and co-workers (2012) concluded that such composites can be suitable for use as panel products in buildings applications. 

Gupta M, Chauhan M, Khatoon N, Singh B (2010) Composite boards from isocyanate bonded pine needles. J Appl Polym Sci 118 3477-3489... 

L.A. Goettler (to Monsanto Co). Treated fibers and bonded composites of cellulose fibers in vinyl chloride polymer characterized by an isocyanate bonding agent. U.S. Patent 4,376,144,1981. 

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