Thermal properties of some butadiene-styrene copolymers

Abstract

The t he rm a l proper ties of 4 1 0 and 122 0 F butadiene-tyre ne copolym ers co n tainin g 8.58 perce nt of bound-sty rene were i n vestiga ted by m eans of an adia batic cal orimeter fr om 16 0 t o 330 0 K . The 4 1 0 F copolym er was found t o crystallize in t he temperat ure ran ge fr om 210 0 to 285 0 K . The 122 0 F co polym er did not exhibi t any crystallizatio n. The glass-t ransfo:mat ion te mperat ures of t he 41 0 and 122 0 F co poly mers were 200 0 a nd 193 0 K , resp~ct lv e l y. The effects of heat tre ~t me n t upon the heat capaci ty a nd t he glass-t ra nsfor-ma tIOn te mperat ure have bee n studIed. The res ults of the hea t-capaci ty mea surem ents :vere used to co mpu te heat capacity, e nthalpy, and e nt ropy from 0 0 t o 33t}° K !"It 5-deg ltl te rv a ls.