摘要
The fractal dimensions (df) of aggregates of latex paticles coated by poly(ethylene oxide)(PEO) have been measuxed in worse than θ-solvents for different concentrations MgSO4 and temperatures by means of dynamic light scattering. For the lowest molar mass PEO studied (20kg·mol-1) the measurement df of about 2.1 was almost independent of temperature over the range studied. The value corresponds to partially reyersible cluster aggregation, which leads to relatively compact aggregates. For the highest molar mass PEO studied (600kg·mol-1), the df decreased significantly (from 2.4 to 1.7) with temperature, singnifying the generation of more ramified aggregates. The results obtained for this hydrophilic polymer contrast makedly with the aggregation of latexes stabilized by the hydrophobic polymer poly(N-isopropylacryldride)(PNIPAM) which undergoes a coil-to-globule transition.
The fractal dimensions (df) of aggregates of latex paticles coated by poly(ethylene oxide)(PEO) have been measuxed in worse than θ-solvents for different concentrations MgSO4 and temperatures by means of dynamic light scattering. For the lowest molar mass PEO studied (20kg·mol-1) the measurement df of about 2.1 was almost independent of temperature over the range studied. The value corresponds to partially reyersible cluster aggregation, which leads to relatively compact aggregates. For the highest molar mass PEO studied (600kg·mol-1), the df decreased significantly (from 2.4 to 1.7) with temperature, singnifying the generation of more ramified aggregates. The results obtained for this hydrophilic polymer contrast makedly with the aggregation of latexes stabilized by the hydrophobic polymer poly(N-isopropylacryldride)(PNIPAM) which undergoes a coil-to-globule transition.
出处
《物理化学学报》
SCIE
CAS
CSCD
北大核心
1995年第10期945-949,共5页
Acta Physico-Chimica Sinica
关键词
分形
聚氧乙烯
聚苯乙烯
硫酸镁
聚集
Fractal dimension, Poly(ethylene oxide)-polystyrene
