6 u00d7 10 sup 6 daltons and contains about 9 4 atactic polystyrene i e polymer extractable with hot methyl ethyl ketone the polymer noted as 34 syndio2 34 is a sample of syndiotactic polystyrene with a weight average molecular weight of about 5 6 u00d7 10 5 daltons the polymer noted as 34 syndio 34 is a sample of syndiotactic polystyrene with a lower molecular weight table iapprox conc b p temp polymer wgt isolvent deg c deg c solubility appearance at room temp ips42 5 01 1 2 3 trichlorobenzene 218 191 soluble hard opaque solid ips42 5 08 1 2 4 trichlorobenzene 214 190 partly soluble ips42 5 08 1 2 4 trichlorobenzene 214 202 soluble clear liquid ips42 5 14 1 benzyl 2 pyrrolidinone 420 275 soluble amber clear viscous fluid ips42 5 14 1 benzyl 2 pyrrolidinone 420 250 partly soluble ips42 5 83 1 chloronaphth alene 258 225 partly soluble ips42 5 83 1 chloronaphthalene 258 250 soluble clear moderately viscous fluid ips42 5 24 1 cyclohexyl 2 pyrrolid inone 301 200 partly soluble ips42 5 24 1 cyclohexyl 2 pyrrolidinone 301 224 soluble amber clear thin jelly ips42 5 21 1 ethyl 2 pyrrolidinone 206 141 swollen gel ips42 5 21 1 ethyl 2 pyrrolidinone 206 190 soluble yellow clear viscous fluid ips42 5 02 1.