Development of Highly Precise Controlling Methods for Polymer Microspher by Taking Advantage of Nonlinear Dynamics

利用非线性动力学开发聚合物微球高精度控制方法

• 批准号: 13555207
• 负责人: OHMURA Naoto
• 金额: $ 8.32万
• 依托单位: Kobe University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2001
• 资助国家: 日本
• 起止时间: 2001 至 2003
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-13555207/
• 关键词: Continuous emulsion polymerization; Nonlinear dynamics; Dynamic process; Bifurcation Phenomena; Self-sustained oscillation; Periodic operation; Unsteadiness; Particle aggregation; 多重安定性; テイラー渦流反応装置; 粒子径分布振動; 重合率振動; 粒子径分布

This research attempted to take advantage of the nonlinear dynamics in continuous emulsion polymerization processes in order to control latex particle size distribution. When the emulsion polymerization of vinyl acetate was conducted in a CSTR under conditions below the critical micelle concentration of the emulsifier, the monomer conversion attained in a time-independent steady-state operation showed a drastic rise from 0 to over 60% at a critical reaction temperature or mean residence time. The mean residence time or the reaction temperature was switched alternately between two values in the non-steady-state operation, one giving zero monomer conversion and the other a high monomer conversion in the usual steady-state operation. The periodic-switching operation induced oscillations in monomer conversion in time. The particle size distribution varied synchronously with the switching operation. This research showed the possibility of controlling the particle size distribution by adjust … More ing the frequency and/or the amplitude of the temporal variation of the mean residence time or reaction temperature. This research found that even while the constant monomer conversion was maintained at the steady state, the particle size distribution oscillated with a very large time period. This research revealed that the oscillations occur by a competitive interaction between polymerization reaction and aggregation of latex particles. In order to vary the colloidal stability of latex particles, a nonionic surfactant was added in some cases. It was found that using a mixture of a nonionic surfactant and an anionic surfactant was very effective for suppressing the oscillations. In order to take advantage of the oscillations of particle size, emulsion polymerization of vinyl acetate was performed in a system of two continuous stirred tank reactors in series. The oscillatory behavior could be controlled by varying the rotational speed of the impeller and the mean residence time. The research using two CSTR in series indicated the possibility of producing various poly-dispersed latex particles. Less

本研究试图利用连续乳液聚合过程中的非线性动力学来控制乳胶粒的粒径分布。当在低于乳化剂的临界胶束浓度的条件下在CSTR中进行醋酸乙烯酯的乳液聚合时，在与时间无关的稳态操作中获得的单体转化率显示出在临界反应温度或平均停留时间下从0急剧上升到超过60%。在非稳态操作中，平均停留时间或反应温度在两个值之间交替切换，一个值给出零单体转化率，另一个值在通常的稳态操作中给出高单体转化率。开关操作引起单体转化率随时间的振荡。颗粒尺寸分布与切换操作同步变化。本研究表明了通过调节来控制颗粒粒度分布的可能性 ...更多信息 计算平均停留时间或反应温度的时间变化的频率和/或幅度。该研究发现，即使在稳定状态下保持恒定的单体转化率，粒度分布也以非常大的时间周期振荡。研究表明，聚合反应和乳胶粒子聚集之间的竞争相互作用导致了振荡的发生。为了改变胶乳颗粒的胶体稳定性，在某些情况下加入非离子表面活性剂。发现使用非离子表面活性剂和阴离子表面活性剂的混合物对于抑制振荡非常有效。为了利用粒径的振荡，在两个串联的连续搅拌釜式反应器的系统中进行了乙酸乙烯酯的乳液聚合。振荡行为可以通过改变叶轮的转速和平均停留时间来控制。采用两个串联的CSTR反应器的研究表明，生产各种多分散乳胶粒子的可能性。少

项目成果

N.Ohmura: "Novel Operating Method for Controlling Latex Particles Size Distribution in Emulsion Polymerization of Vinyl Acetate"Industrial & Engineering Chemistry Research. 40-23. 5177-5183 (2001)

N.Ohmura：“醋酸乙烯乳液聚合中控制乳胶粒径分布的新操作方法”工业

N.Ohmura: "Self-Sustained Oscillation of PSD of Latex Particles in Continuous Emulsion Polymerization"Proc.9th APCChE Congress and CHEMECA 2002. (CD-ROM). 1-8 (2002)

N.Ohmura：“连续乳液聚合中乳胶颗粒 PSD 的自持续振荡”Proc.9th APCChE 大会和 CHEMECA 2002。（CD-ROM）。

K.Kataoka: "Self-sustained Oscillation of Particle Size Distribution in Continuous Emulsion Polymerization"Proceedings of 15^<th> International Congress of Chemical and Process Engineering, Praha, Czech. A5-2-38(CD-ROM). (2002)

K.Kataoka：“连续乳液聚合中粒度分布的自持振荡”第 15 届国际化学与过程工程大会论文集，捷克布拉格。

K.Kataoka: "Self-Sustained Oscillation of Particle Size Distribution in Continuous Emulsion Polymerization"Proc.15^<th> International Congress of Chemical and Process Engineering. (CD-ROM). 1-5 (2002)

K.Kataoka：“连续乳液聚合中粒度分布的自持续振荡”Proc.15^<th>国际化学与过程工程大会。

Naoto Ohmura: "Effect of Aggregation of Polymer Particles on Particle Size Distribution in Continuous Emulsion Polymerization of Vinyl Acetate"Proc.6th Italian Conference on Chemical and Process Engineering. 3. 1319-1324 (2003)

Naoto Ohmura：“醋酸乙烯连续乳液聚合中聚合物颗粒聚集对粒度分布的影响”Proc.6th 意大利化学与过程工程会议。