Polystyrene (PS) microparticles were prepared by freeze-drying a very dilute cyclohexane solution and by spraying a dilute benzene solution into methanol. D.s.c. studies showed that the microparticles have a transition at a temperature lower than the Tg of bulk PS. This low temperature transitiotJ was regarded as the glass transition of the PS microparticles, and it was suggested that the decrease in Tg of the particles was due to their high surface area to volume ratio.
Посилання на статтю:
Glass transition temperature of polystyrene microparticles / Jianfu Ding*, Gi Xue, Qingping Dai and Rongshi Cheng // Polymer. – 1993. – Vol 34. – P. 3325-3327.