Abstract: A carbon-chain-containing photoinitiator (BPL) derived from benzophenone (BP) and a carbon-chain-containing multifunctional monomer (STAIC) derived from triallyl isocyanurate (TAIC) were used for photocrosslinking of linear lowdensity polyethylene (PE-LLD).Photoinitiation efficiency and thermal migration properties of BPL and STAIC in PE-LLD were investigated comparatively with BP and TAIC.The results indicated that combination of BPL and STAIC could initiate the photo-crosslinking of PE-LLD with high efficiency, and the optimum amounts of BPL and STAIC used for PE-LLD were 2.1 and 2.0 phr, respectively.Thermal migration test revealed that BPL and STAIC exhibited a much lower thermal migration rate in PELLD than BP and STAIC, respectively.After thermal migration, the photoinitiation efficiency of BPL and BP decreased by 3.6 % and 72.5 %, respectively.Furthermore, the enhanced crosslinking efficiency for STAIC in PE-LLD decreased by 46 %, whereas TAIC showed little influence on the photocrosslinking of PE-LLD.