摘要
采用动态激光光散射及环境扫描电镜研究了羧甲基纤维素型高分子表面活性剂在水溶液中的胶束形态 .结果表明 ,共聚物在水溶液中的形态完全不同于羧甲基纤维素分子 ,亲水疏水链段的引入 ,使共聚物分子聚集形成了以疏水链段为核心的棍状胶束结构 .高分子表面活性剂水溶液体系的归一化一级相关函数不符合单指数衰减 ,表明胶束形态的多分散性 .在 0 .0 0 5%～ 1 %浓度范围内 ,胶束粒子大小均分布在两个区域 ,随共聚物浓度增大 ,低粒径区保持在 3 0～ 1 0 0nm范围 ,为单分子区 ;而高粒径区随浓度增大移向更高值 ,表明多分子胶束不断长大 .
The micellar conformation of polymeric surfactants CMC AR 12 EO 9 in aqueous solutions was studied by dynamic laser scattering and environmental scanning electron microscopy. The results show that the conformation of copolymer molecules is totally different from that of carboxy methyl cellulose because of the introduction of the surface active macromonomers. CMC AR 12 EO 9 molecules aggregate to from rod\|like micelles with hydrophobic cores. It is confirmed that the micelle size distribution function F(R) is dependent on scattering vector. So the micelles of CMC AR 12 EO 9 are not like sphere. In the range of concentration tested, the normalized first\|order autocorrelation function g (1) (τ) of CMC AR 12 EO 9 can not be represented by single\|exponential decays, which indicates polydisperse distributions of micelle sizes. At different concentrations, the sizes of micelles all distribute in two regions (low and high size). With the increasing of copolymer concentration, the lower size region remains in 30～100nm and is considered to be the region of mono\|molecular micelles. While the particle size in higher size region increases gradually, which means that multi\|molecular micelles are growing larger.
出处
《高分子学报》
SCIE
CAS
CSCD
北大核心
2000年第3期345-349,共5页
Acta Polymerica Sinica
关键词
高分子表面活性剂
羧甲基纤维素
胶束形态
Polymeric surfactant
Carboxy methyl cellulose
Micellar conformation
