Polypropylene Glycol PPG

Polymers such as the acrylic PVM/MA copolymer are added to prevent bacteria from breaking down pyrophosphates. Other long polymers used are polyethylene glycol (PEG) in various weights (PEG-6, PEG-8, PEG-40, etc.), and polypropylene glycol (PPG). 

Most automobile and furniture seating, foam mattresses, carpet underlay-ment, and other similar products are made from polyurethanes based on polypropylene glycol (PPG). PPG is the preferred raw material for these type of polymers because of the wide variation of possible properties of the end product and the relatively low cost. 

M. Sano. Polypropylene glycol (PPG) used as drilling fluids additive. Sekiyu Gakkaishi, 40(6) 534-538, November 1997. 

Segmented poly(ether urethanes) were synthesized from polypropylene glycol (PPG) and 4,4 methylene-bis(phenyl-isocyanate) (MDI), using l,l -bis(B-aminoethyl)ferrocene (1) and 1,1 -bis(B-hydroxyethyl)-ferrocene (2) as chain extenders. 

Polymerised propylene, a polyolefin plastic with properties similar to those of polyethylene. Polypropylene Glycol (PPG)... 

A polyurethane is fonned by reacting a hydroxyl-terminated polyether or polyester with an isocyanate. An example in commercial practice is the reaction of toluene diisocyanate and polypropylene glycol (PPG) to produce one of the most common forms of polyurethane (see Figure 2.6). 

It has been reported that the polypropylene glycol (PPG) membrane responds to alkali metals (7). Since KP-13 (a kind of polyurethane) has the same polyether parts as PPG, it is considered that the reason of the different selectivity may be the direct interaction of the polyether part of the KP-13 matrix material. 

Feng and Waldman used 4,4 -diphenylmethane diisocyanate. The polyol is either 2000 or 4000 molecular weight polypropylene glycol (PPG) and the catalyst is dibutylin dilaurate (DBTOL). The NOC-terminated urethane prepolymers are made in the usual way by reacting an excess of methane diisocyanate with PPG in the presence of DBTDL at an NCO OH ratio of 1.4 2.0. The reactions are run at 70°C for about 3 h to reach a constant percentage of NCO. 

System 1 This morphology is produced when no reaction can occur between the impact modifier and the accelerator. This can be achieved by using as impact modifier a methoxylated polypropylene glycol (PPG) ("solution I ). 

Polyether-polyols are produced by the poiyaddition of an epoxide (propylene or ethylene oxide) to an active hydrogen initiator (polyol, amine, add. water, etc.). Polypropylene glycol PPG) is obtained by the poiyaddition of propylene oxide to propylene glycol, used as an initiator ... 

Addition of propylene oxide to 1,2-propylene glycol results in polypropylene glycol (PPG) ... 

Usually the primary (P) glass-rubber relaxation cannot be resolved from the secondary relaxation at hypersonic frequencies. However, this is not always the case. The Brillouin frequencies Awd) and tan 8 for polypropylene glycol (PPG) (13) are plotted versus temperature in Figure 9. Two tempratures of maximum loss are observed. The higher temperature loss at 100 °G and a frequency of 4.40 GHz correlates very well with the primary glass-rubber relaxation line determined by dielectric relaxation at gigahertz frequencies (13), The lower temperature loss at 50°G and a frequency of 5.43 GHz correlates with an extension of the secondary transition line. The transition map is shown in Figure 10. 

A critical factor in the success of a particular separation in an ABS may be the choice of polymer. The polymer not only affects the distribution of the solute between the phases but also has a considerable effect on the physical characteristics of the phases. It may be possible to fine-tune the polymer-rich phase by choosing from a variety of commercially available polymers whose hydrophobicity increases as PEG < Pluronic [block PEG/ polypropylene glycol (PPG) copolymers] < PPG < polytetramethylene glycol (Fig. 3 [36—40]). PPG-2000 is essentially water insoluble (and thus can be utilized neat) but is included for comparison with the ABS systems. The Pluronic polymer used, L64, has a very narrow range of usefulness [41], At low polymer and salt concentrations it forms a monophasic system. If the concentration of polymer and salt is too high, the polymer tends to foam out of solution. 

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