Citation: . EFFECT OF PARTICLE SIZE ON THE FILMING PROCESS OF POLYSTYRENE LATEX STUDIED BY AFM[J]. Chinese Journal of Polymer Science, ;2002, 20(6): 509-515. shu

EFFECT OF PARTICLE SIZE ON THE FILMING PROCESS OF POLYSTYRENE LATEX STUDIED BY AFM

Received Date: 27 November 2001
Revised Date: 4 January 2002

The film formation process of micro-PS particles (diameter 742 nm) and nano-PS particles (diameter 29 nm) wasstudied by atomic force microscopy and differential scanning calorimetry. During a step heating process, the particles wereannealed for 0.5 h at each selected temperature. It was found that the deformation and interdiffusion temperatures of themicro-PS particles are ca. 120-130℃ and 140-150℃, that of the nano-PS particles are 90℃ and 100-110℃ respectively.The DSC traces of nano-PS particles showed that there was an exothermic peak near Tg after annealing for 0.5 h at the selected temperatures below 90℃ ;otherwise,the exothermic peak disappeared after annealing at 100℃ or above.Compared with the micro-PS particles,the sintering process of nano-PS particles occurs at much lower temperature determined by the confined state of polymer chains with higher conformational energy in nano-particles,and completes in a much narrower temperature range driven mainly by the larger total surface energy.
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