丙烯腈和(甲基)丙烯酸酯基团转移共聚合的竞聚率

THE REACTIVITY RATIOS OF GROUP TRANSFER COPOLYMERIZATION OF ACRYLONITRILE WITH METHACRYLATES

研究了丙烯腈（ＡＮ）和甲基丙烯酸甲酯（ＭＭＡ）、乙酯（ＥＭＡ）、丁酯（ＢＭＡ）、丙烯酸丁酯（ＢＡ）和顺丁烯二酸二丁酯（ＤＢＭ）等５种酯类单体的基团转移无规共聚．用ＫｅｌｅｎＴｕｄｕｓ法测定了二元共聚体系的竞聚率，分别为ｒＡＮ＝１０２２、ｒＭＭＡ＝０７７、ｒＡＮ＝５６８、ｒＥＭＡ＝０１６、ｒＡＮ＝８５９、ｒＢＭＡ＝００９、ｒＡＮ＝４０８、ｒＢＡ＝００６；ｒＡＮ＝１３８，ｒＤＢＭ＝００６．发现竞聚率，单体组分对聚合速率的影响等都和阴离子共聚类似．

Random copolymerization have been performed for five binary systems using 1 methoxy 2 methyl 1 trimethylsilyloxy propene(initiator) and tetrabutylammonium bibenzoate (catalyst) in tetrahydrofuran solution.The copolymer compositions were determined by elemental analysis for nitrogen and the results calculated by the Kelen Tudos method.The monomer pairs concerned are (1) acrylonitrile (AN) and methyl methacrylate (MMA),(2)AN and ethyl methacrylate (EMA),(3)AN and butyl methacrylate (BMA),(4)AN and butyl acrylate (BA),(5)AN and dibutyl maleate (DBM).The reactivity ratios determined in this study are:(1) r AN =10 22, r MMA =0 07;(2) r AN =5 68, r EMA =0 16;(3) r AN =8 59, r BMA =0 09;(4) r AN =4 08, r BA =0 06;(5) r AN =1 38, r DBM =0 06.The results show that GTP is similar to anionic polymerization with respect to the reactivity ratios.