Glass transition temperature of polystyrene microparticles
β Scribed by Jianfu Ding; Gi Xue; Qingping Dai; Rongshi Cheng
- Publisher
- Elsevier Science
- Year
- 1993
- Tongue
- English
- Weight
- 378 KB
- Volume
- 34
- Category
- Article
- ISSN
- 0032-3861
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## Abstract **Summary:** A unified model is developed for the finite sizeβeffect on the glassβtransition temperature of polymers, __T__~g~(__D__), where __D__ denotes the diameter of particles or thickness of films. In terms of this model, __T__~g~ depends on both the size and interface conditions.
A quantitative explanation is given for the apparent viscosity increase with increasing capillary shear rate for polystyrene at temperatures approaching the glass transition, T,. Possible shifts in T, as a function of the parameters shear rate, frequency, and pressure are interrelated to viscosity
Lap shear and friction force measurements were carried out on a series of monodisperse polystyrene (PS) films below the corresponding glass-transition temperatures. It showed that adhesion between the PS/PS interface was possible at the temperature below the bulk T g , and the lower the molecular we