Dear all,
After consulting some chemical compatibility charts, I noticed that for PP the compatibility for octane and hexane is significantly different than for heptane. Where does this difference originate from?
In my practice there was such an observation. The disinfecting property of nonyl isothiuronium chloride for Escherichia coli was an order of magnitude greater than the C8 and C10 of homologues. We obliged ourselves by the coincidence of the size of the hydrophobic pocket of the enzyme with the size of the nonyl radical. Perhaps the amount of empty space in polypropylene is the same as the size of heptane. Therefore, its compatibility with PP is better.
this is from solubility factor and polarity.
you can see this happening in methanol-ethanol and propanol, too
I could not find relevant literature about this topic but I think that prevention of recrystallization of PP is the main reason. Perhaps the even membered alkanes leads only to a good solvatization of the main chain of the polymer against what odd membered alkanes can also involve the methyl side groupa of PP.
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