Polypropylene glycol, reaction rates

The photooxidation rates of nylon polymers have been monitored using Fourier Transform Infra-red spectroscopy. Norrish type-II reactions of carbonyl groups were considered to be the most important process. Another group of workers have studied the photooxidations rates of a nylon 6- polypropylene glycol copolymerIn this case polyether sequences are the major source of free radical attack resulting in high levels of hydroperoxides. Irradiation of nylon and polyester fibres with an excimer laser resulted in... 

The reaction rates of some common polyols are listed in Table 4.3 where it can be seen that the values of polyesters and polyethers are usually higher than that of simple diols such as 1,4-butane diol. Also when secondary OH groups are introduced into the polyol the reaction rates are reduced, as seen in Table 4.4 where OH-terminated polypropylene glycol is reacted with MDI. The polypropylene glycols of similar molecular weight give reaction... 

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