摘要
将马来酸酐接枝到聚醚多元醇(PPO)中,并经端基环氧丙烷化和异构化反应,合成了不同结构的大分子齐聚物,并用于苯乙烯/丙烯腈在聚醚多元醇中的分散聚合,合成了聚合物多元醇(POP)。采用核磁共振分析表征了大分子齐聚物的结构和异构化程度;采用透射电子显微镜、激光粒度分析,对POP中粒子的微观形貌、粒径(D(4,3))大小及其分布(PDI)进行了表征。结果表明,大分子齐聚物中反式结构含量越高,所合成POP中粒子的D(4,3)及其PDI越小;随着大分子齐聚物用PPO官能度由2增加到6,支链分子量由1000增加到2000,POP中粒子的D(4,3)和PDI越小;随着D(4,3)和PDI的减小,POP体系的粘度显著降低。
Polymer polyols（POP）were synthetized by in-situ dispersion polymerization in order to investigate the relationship between the structures of dispersants and the properties of the POP.The investigation is intended to provide a theoretical concept to get high solid and low viscosity POP products.Maleic anhydride was grafted to the polyether polyol（PPO）and capped with propylene epoxide,and then an isomerization reaction was made to prepare a series of dispersants,which were used to synthetize POP with styrene and acrylonitrile.The cis-trans rate was characterized by 1 H-NMR.The particle size（D（4,3））,distributions（PDI）and morphology were tested by laser particle size analyzer and TEM.Result shows,the POP particles have a bimodal or multimodal distribution with the increase in trans-structure rate and the reduction of（D（4,3））and PDI.When functionality of dispersants（f）is 3,with length of each（m）chain increased from 1000 to 2000,D（4,3）/PDI of particles reduced from 8.220um/54.80 to 0.227um/3.21.When m is 2000,with f increased from 2to 6,D（4,3）/PDI of particles reduced from 5.109um/45.60 to about0.250um/3.3.With D（4,3）and PDI of particles in POP decreased,the viscosity of POP reduced constantly.
出处
《材料科学与工程学报》
CAS
CSCD
北大核心
2016年第2期223-228,共6页
Journal of Materials Science and Engineering
关键词
分散剂
接枝共聚
聚合物多元醇
分散聚合
顺反异构体
Dispersants
Grafted copolymerization
Polymer polyols
Dispersion copolymerization
Cistrans isomers
