Estimate the cSE parameter for poly$($styrene$)$ and poly$($ethylene$)$ using solubility

parameters $($Table $7\mathrm{.}1$ in the required textbook$)$ at $140\backslash$deg C$.$ Assume the density of PS and PE are

$0\mathrm{.}969$ and $0\mathrm{.}784$ g$/$cm$3$ at $140\backslash$deg C$.$ Use the somewhat arbitrary segment $($lattice site$)$ volume to be $3$

$118.($This value is often assumed in the literature for hydrocarbon polymers. Note: $1=0\mathrm{.}1$ nm $=10-8$ cm$).$

table $7\mathrm{.}1$ gives solubility for styrene to be $9\mathrm{.}1$ and ethylene $7\mathrm{.}9$