To reduce the π-π stacking among the PAM units while enabling their TSCT to NDI, we copolymerized the PAMs with styrene and obtained a series of NDI-initiated copolymers (NDI-coM, where M represents the PAM) with different monomer feed ratios (Figure ). For instance, NDI-coPyMA was synthesized with a PyMA feed fraction ranging from 0.1% to 10%. At a higher PyMA fraction, the MW of the resulting copolymers decreased, most likely due to the lower polymerization rate caused by the steric hindrance of the large aromatic groups. Nevertheless, NDI-coPyMA showed well-controlled monomer molar ratios (0.2%-20.7%) and low polydispersity (Đ < 1.2) with MW ranging from 2000 to 6000 g mol -1 (Table ). As shown in Figure (left), when the PyMA feed fraction was 0.1%, NDI-coPyMA exhibited a single emission peak at 460 nm. Its intensity gradually decreased upon increasing the PyMA feed fraction, while a redshifted emission peak emerged with increasing intensity. At 10%