GL$177.$ PS $($MW $=5,000),$ PS $($MW $=10,000)$ PMMA $($MW $=5,000)$ GPC $$ Rl $$ THF $$ THF $$ PMMA $$ MW $$ PS $$: $-$ PS $=1\mathrm{.}0($RI$)-$ Toluene $$ Rl $=0\mathrm{.}9-$ Rl of THF $=0\mathrm{.}8$ Rl of PMMA $=1\mathrm{.}4$