摘要
以二甲基亚砜为溶剂,偶氮二异丁腈为引发剂,用溶液聚合法合成了炭纤维用丙烯腈(AN)-丙烯酰胺(AM)共聚物。低转化率下,测得单体竞聚率,讨论了聚合机理模型。采用统计方法,推测了不同转化率下AN与少量AM(AM的摩尔分数<5%)共聚物的微观结构。结果表明,在该聚合体系中,AN、AM的竞聚率值分别为r(AN)=0.46,r(AM)=0.01;AN与AM聚合机理为末端基终止模型;AM的引入降低了AN单元的数均序列长度;随着转化率的提高,链段分布逐渐变宽,AN长序列单元逐渐增加。
AN-AM copolymers were synthesized in dimethylsulfoxide(DMSO) using azobisisobutyronitrile(AIBN) as an initiator. Based on Mayo-Lewis equation, the reactivity ratios obtained from KT method are r__1 (AN)=(0.46),r__2 (AM)=(0.01). The effect of polymerization conversion on the microstructure of copolymers(the AM molar fracture in the feed is lower than 5%) was investigated by statistical method for the first time. The results show that the number-average sequences length of AN are reduced when AM is introduced. At lower polymerization conversion, AM is easier to copolymerize with AN and the product has an alternate character. As polymerization proceeds, AN long sequences are increased and and the sequence distribution gets broad.
出处
《高分子材料科学与工程》
EI
CAS
CSCD
北大核心
2005年第2期132-134,138,共4页
Polymer Materials Science & Engineering
基金
中科院创新方向性项目(KGCX2-SW-204)
关键词
丙烯腈
丙烯酰胺
竞聚率
微观结构
acrylonitrile
acrylamide
reactivity ratios
microstructure
