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Citation: Yao Song-Nian. Studies of the Fractal Dimension of Aggregation of Polystyrene Labices Sterically Stabilized by Poly(ethyleneoxide) in the Solution of MgSO₄[J]. Acta Physico-Chimica Sinica, ;1995, 11(10): 945-949. doi: 10.3866/PKU.WHXB19951019 shu

Studies of the Fractal Dimension of Aggregation of Polystyrene Labices Sterically Stabilized by Poly(ethyleneoxide) in the Solution of MgSO₄

Yao Song-Nian

1.
The Centre for Analysis and Measurement,Wuhan University,Wuhan 430072

Received Date: 30 October 1994
Available Online: 15 October 1995

The fractal dimensions (df) of aggregates of latex paticles coated by poly(ethylene oxide)(PEO) have been measured 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 reversible 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 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-isopropylacrylamide)(PNIPAM) which under es a coil-to-globule transition.
- Fractal dimension,
- Poly(ethylene oxide)-polystyrene
  ,
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Studies of the Fractal Dimension of Aggregation of Polystyrene Labices Sterically Stabilized by Poly(ethyleneoxide) in the Solution of MgSO4

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通讯作者: 陈斌, bchen63@163.com

Studies of the Fractal Dimension of Aggregation of Polystyrene Labices Sterically Stabilized by Poly(ethyleneoxide) in the Solution of MgSO₄