Size Control of Polyamic Acid Particles in Precipitation Polymerization by Using Solubility Parameters

作者：Asao Katsuya^*; Yoshioka Yayoi; Watano Satoru

来源：Kagaku Kogaku Ronbunshu, 2012, 38(1): 39-44.

DOI：10.1252/kakoronbunshu.38.39

• Polyimide
• Polyamic Acid
• Hansen Solubility Parameter
• Size Control
• Particle

Polyamic acid particles, the precursors of polyimide particles, are basically prepared by a precipitation polymerization in which diamine and tetracarboxylic acid dianhydride are irradiated with supersonic waves at room temperature. Polyimide particles are then produced by thermal processing of the polyamic acid particles. Such polyimide particles are characterized by their size uniformity and spherical shape. The physical properties of polyamic acid particles such as size, size variation and shape vary are reported to depend on the reaction solvent, but a detailed investigation of this effect has not been reported. %26lt;br%26gt;In this study, the effect of reaction solvent on mean size of polyamic acid particles was investigated by using Hansen Solubility Parameters (HSP). It was found that the mean size of polyamic acid particles was correlated with the HSP distance between reaction solvent and polymer. Also, calculation of the constituent energies of the HSP suggested that delta(d), the energy from the dispersion force between molecules, was dominant. As a result, it was concluded that the HSP could be used to control the mean size of polyamic acid particles.

• 出版日期2012