單項(xiàng)選擇題兩種單體共聚時(shí),r1<1,r2<1,共聚物組成曲線是()

A、在對(duì)角線下方,與對(duì)角線無(wú)交點(diǎn)
B、先下后上,與對(duì)角線有交點(diǎn)
C、在對(duì)角線的上方,與對(duì)角線無(wú)交點(diǎn)
D、先上后下,與對(duì)角線有交點(diǎn)(恒比點(diǎn))


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1.單項(xiàng)選擇題兩種單體共聚時(shí),r1>1,r2<1,下列說(shuō)法中正確的是()

A、共聚物組成曲線為在對(duì)角線下方
B、共聚物組成曲線為先下后上,與對(duì)角線有交點(diǎn)
C、共聚物組成曲線為在對(duì)角線的上方,與對(duì)角線無(wú)交點(diǎn)
D、隨轉(zhuǎn)化率增大,共聚物中單體M1的含量增加

2.單項(xiàng)選擇題苯乙烯(M1)和丁二烯(M2)在5℃下進(jìn)行自由基乳液共聚時(shí),其r1=0.64,r2=1.38,共聚物組成曲線是()

A、先上后下與對(duì)角線有交點(diǎn)
B、先下后上
C、在對(duì)角線上方,與對(duì)角線無(wú)交點(diǎn)
D、在對(duì)角線下方,與對(duì)角線無(wú)交點(diǎn)