Effect of stirring on preparation of hollow copolymer particles byalkali/cooling method

来源期刊：中南大学学报(英文版)2009年第4期

论文作者：李海普 OKUBO M SUZUKI T

文章页码：563 - 569

Key words：hollow polymer particle; stirring effect; morphology; emulsion copolymerization

Abstract: Hollow particles were prepared by the treatment of styrene-methacrylic acid copolymer particles with alkali/cooling method. The influences of stirring position (in aqueous phase or at the interface of O/W) and stirring speed (90, 110 and 240 r/min) on the formation of hollow particles were investigated. It is found that the soft stirring in aqueous phase at 90 r/min leads to the formation of monohollow particles, while the violent stirring at the interface of O/W and 240 r/min gives non-hollow products. In contrast, the weak stirring in aqueous phase at 110 r/min results in sterically heterogeneous dispersion of methacrylic acid-rich regions within the original particles, and hence the formation of multihollow particles. Further investigation indicates that the change of stirring efficiency provides a way to tune the diffusion behavior of monomer styrene, and therefore influences the distribution of methacrylic acid units in the original particles as well as the morphology of the treated particles.

基金信息：Hunan Provincial Natural Science Foundation of China