SEARCH Articles Figures Tables 2,2 ,7,7 -Tetrakis -9,9 -spirobifluorene 2,2 ,7,7 -tetrabromo-9,9 spirobifluorene Polymers Containing Spirobifluorene Polymers Containing Spirobifluorene Units Spirobifluorene Spirobifluorene Spirobifluorene units, polymers