Bomb-calorim etric m easurements have yi elded for the heats of combustion (-t:"Hc 0) at 25° C of liquid styrcne and solid polystyrene to form gaseous carbon d ioxide and liquid watcr the va lues 4394.88 ± 0.67 into kj /mole (1050.58± 0.14 kcal/mole) , and 4325.09± 0.42 int.kj / CsH s-unit (1033.89± 0.10 kcal/CsH s-unit), resp ectively, and for the h eat of polymerization of liquid styrene to solid polystyrene at 25° C the value 69.79 ± 0.66 into kj /mole (16.68 ± 0.16 kcal/mole) .Th e results obtained on two samples of polystyrcne of different molecular weight were in agreement within th e p'recision of the measurements.M easurements of the heat of olution of solid polystyrenc in liquid monomeric styrene gave the valu e 3.59 ± 0.21 l,nt.kj (0.86 ± 0.05 kcal) e volved per CsH s-unit of polystyrene at 25 ° C. Addition of this to the value for the heat of polymerization of liquid styrene to solid polystyrene gives the value 73.38 ± 0.69 into kj (17.54 ± 0.16 kcal) per mole of styren c for the heat of polymerization of liquid styrene at 25° C, when the final product is a solution of polystyrene in styrene containing 6.9 percent by weight of polystyrene.
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Roberts et al. (1947) studied this question.