共轭效应也使聚合热降低 CH2=CH CH2=CH CH2=C(CH3) 6u5 CH=CH 2 CHECH2 699 72.8 74.5 k/mol CH2=CH CH2=CH CH CN COoR CH2=C 72.4 787 35 CsH共轭效应也使聚合热降低 CH2=CH CH2=CH CH2=C(CH3) C6H5 CH=CH2 CH=CH2 69.9 72.8 74.5 kJ/mol CH2=CH CH2=CH CH3 CN COOR CH2=C 72.4 78.7 35 C6H5