N-丁基马来酰亚胺/苯乙烯微乳液共聚合研究

研究了氘代氯仿中 N-丁基马来酰亚胺 (NBMI)和苯乙烯 (St)的络合性能 .以十二烷基硫酸钠 (SDS)和正戊醇 (PTL)为复合乳化剂 ,配制了含有 NBMI(M1)和 St(M2 )的 O/ W微乳液 .用过硫酸钾引发该体系进行微乳液共聚合 .固定乳化剂的浓度为 [SDS]=0 .2 1 mol/ L ,[PTL ]=0 .2 8mol/ L ,详细研究了聚合温度、单体配比和引发剂用量对共聚合动力学的影响 .用元素分析法确定共聚物的组成 ,进而求算出两种单体的竞聚率 (r1=0 .0 5 ,r2 =0 .0 8) .热分析结果显示 ,当单体组成比 f1=0 .4～ 0 .7时 ,共聚物的玻璃化转变温度基本恒定 (Tg=42 1 .6 K) .实验结果表明 ,当单体配比在一定范围内 (f1=0 .4～ 0 .7)变化时 ,用微乳液聚合法制备的 N-丁基马来酰亚胺 /苯乙烯共聚物具有交替共聚结构 .

N-丁基马来酰亚胺/双环戊二烯共聚物的合成与表征

以偶氮二异丁腈为引发剂 ,采用溶液聚合法首次合成了NBMI -co -DCPD共聚物 ,用IR、DSC和TGA对共聚物进行了表征 .结果表明 :该共聚物具有较高的玻璃化转变温度 ,耐热性能良好 .

N-丁基马来酰亚胺/苯乙烯微乳液共聚合研究

研究了氘代氯仿中N丁基马来酰亚胺 (NBMI和苯乙烯 (St)的络合性能 .以十二烷基硫酸钠和正戊醇为复合乳化剂 ,配制了含有NBMI和St的O/W微乳液 .用过硫酸钾引发该体系进行微乳液共聚合 ,考察了聚合温度、单体配比对共聚合的影响 ,并对共聚机理进行了研究 .结果表明 ,N丁基马来酰亚胺 /苯乙烯微乳液共聚合是按照自由络合机理进行的 ,在共聚合过程中 ,既有自由单体参与 ,又有电荷转移络合物 (CTC)参与 .

Kinetic Treatment for Copolymerization of Styrene or Methyl Methacrylate with N-phenylmaleimide

Shirota's kinetic model and our kinetic model were used to treat the kinetic data of styrene (St) and N-phenylmaleimide (PMI) copolymerization in which charge-transfer complex (CTC) was formed. The results obtained by Shirota's kinetic model were disagreed with the experiments and the experimental phenomena could not be explained. The kinetic data of all feed fractions can be treated with our kinetic model, and the experimental phenomena can be explained from the propagation constants and reactivity ratios. Our kinetic model is also suitable for the kinetic data of methyl methacrylate (MMA) and PMI copolymerization in which CTC can not be formed.