取代基的位阻效应将使聚合热降低 CH2=CH2 CH2=C(CH3)2 CH2=0 95.0 51.5 54.4 k/mol CH 3 CH CHEC CH2=( CHEO COoCH 65 56.5 35 0.0 kJ/mol取代基的位阻效应将使聚合热降低 CH2=CH2 CH2=C(CH3)2 CH2=O 95.0 51.5 54.4 kJ/mol CH3 CH3 CH3 CH2=C CH2=C CH=O COOCH3 C6H5 56.5 35 0.0 kJ/mol