Functionalization polypropylene glycol

The laminating adhesive for Samples 1-3 was a 100 25 mix of an isocyanate terminated polyurethane prepolymer based upon polypropylene glycol and MDI (amount of free monomer approximately 25%) and a tri-functional polypropylene glycol with a molecular weight of approximately 450. 

Figure 7.30 Experimental temperature increases for a Newtonian fluid (polypropylene glycol) as a function of the shearing time [47]. The data are for a square-pitched screw with a channel depth of 3.78 mm, a barrel diameter of 49.7 mm, and rotations at 55 rpm...

Figure 7.31 Viscosity of the polypropylene glycol fluid as a function of the absolute temperature [5]...

Aliphatic Glycidyl Ethers. Aliphatic epoxy resins have been synthesized by glycidylation of difunclional or poly functional polyols such as a 1.4-butanediul. 2.2-dimethyl-1.3-propanediol (neopentyl glycol), polypropylene glycols, glycerol, irimethylolpropane. and pentaerythritol. 

Materials Two commercial polypropylene glycols (polyols) of different functionality were used. The trifunctional polyol is Union Carbide NIAX 16-56, and the difunctional polyol is Union Carbide NIAX 2025. Each has an equivalent weight approximating 1.00 kg. The polyols were dried with bubbling dry nitrogen while... 

Polyether polyols, especially polypropylene glycols, have lower functionality than is theoretically due to the presence of side reactions during synthesis (see details in... 

Chapter 12.5). Polyester polyols in reality, have the theoretical functionality, which is a great advantage for many polyurethane applications. For polyester diols the functionality is 2 OH groups/mol. This structural aspect results in the polyester diols giving PU elastomers with excellent physico-mechanical properties, superior to all polypropylene glycols obtained by anionic PO polymerisation. 

Component Composition (wt%) Part 1 Aluminum oxide 41.40 Polypropylene glycol, Function... 

An attractive example of dual functional agents for biological imaging applications was reported by Sun et al. A fluorescent ruthenium complex was immobilised on to the surface of magnetic nanoparticles via 3-(3,4-dihydroxyphenyl) propanoic acid (DHPPA) and 0,0 -bis(2-aminopropyl) polypropylene glycol-A/ock-polyethylene glycol-i/ock-polypropylene glycol (PPG-PEG-PPG-diamine). ... 

Figure 4. Raw friction data as a function of rotation for the self-mated polypropylene sliding contact lubricated by aqueous solution with and without poly(L-lysine)-gra/f-poly(ethylene glycol) (PLL-g-PEG) (load, ION diameter of the pin, 6mm sliding speed, S.lmms" number of rotations, 1000).

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