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:\1easurement s have been made a t t emperat ures near 27° and 30 ° C of t he den sities of pu rifi ed ben zene, to luene, ethylbenzene, a nd 2-but anone (methy lethylketone) , a nd of solutions of a purifi ed sample of p olysty r ene in t hese solven ts. 'Wi thi n t he precision of t he meas urements (abou t 1 or 2 in 105 density) t he appa ren t specific volume of the polystyrene is a constan t independ ent of t he concen t rat ion in a nyone solvent, bu t d epends to so me exten t upon t he solven t . The lowes t values, which were obtained wi t h 2-bu tanone, a l'e a bout 1 p ercent lower t han t he hi ghest val ues, \ V hi ch were obt ained wit h ethylbe nzene . The va lu es are a ll lower t han t hose of th e vir t ua l liquid polym er , ob tained by extrapolation of data on specifi c volume above t he glass t ra nsi t ion temperature, although t he data of o t her obser vers indi ca te t hat t his is n ot t ru e for all solvents. I n a ll fo ur solven t s t he cha nge of t he appa ren t specific volume wi t h temp erature is less t han fo r t he liq uid p olym er. The changes in volume upon mi xin g of polystyr ene wi t h t he solven ts are shown to have a signifi cant cffect on s uch then nod.vna mi c proper t ics as heat , Free energy , a nd cnt ropy of mix ing .

Apparent specific volume of polystyrene in benzene, toluene, ethylbenzene, and 2-butanone