(1)乙烯与丙烯发生加聚反应!(2)nCH2=CH2 + nCH2=CHCH3 ==> -[-CH2-CH2-CH2-CH(CH3)-]-n(3)nCH2=CH2 + nCH2=CHCH3 ==> -[-CH2-CH2-(CH3)CH-CH2-]-n