“…13–15 Much work has been done on material design of high- χ block copolymers. Some indicative high- χ systems that have yielded ultra-small feature sizes are poly(styrene)- block -poly(glycerol monomethacrylate) (PS- b -PGM), 16,17 poly(cyclohexylethylene)- block -poly(methyl methacrylate) (PCHE- b -PMMA), 18 poly(dimethylsiloxane)- block -poly( d , l -lactide) (PDMS- b -PLA) 19,20 and poly(4-trimethylsilylstyrene)- block -poly( d , l -lactide) (PTMSS- b -PLA). 21 A practice often followed is the incorporation of blocks with vast difference in polarity as for example for poly(3-hydroxystyrene)- block -poly(dimethylsiloxane) (P3HS- b -PDMS), 22 or poly(styrene)- block -poly(hydroxyisobutylene) (PS- b -PHIB).…”