reSeArCH Letter
Extended Data Fig. 1 | Mass spectroscopy analysis and confirmation
of livingness of APEX polymerization. a, MALDI–TOF mass spectrum
(reflection mode) of fjord-type GNR 2 (Mn = 1.3 × 104 , Đ = 1.23) with
trans-2-[3-(4-tert-butylphenyl)-2-methyl-2-propenylidene]malononitrile
(DCTB) as the matrix. b, Summary of observed and calculated molecular
ion peaks. c, Confirmation of livingness of APEX polymerization by
one-pot SEC analyses. d, SEC charts of the reaction progress after 1 h, 3 h
and 12 h.