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

这项研究试图利用连续乳液聚合过程中的非线性动力学，以控制乳胶粒度分布。当在低于乳化剂的临界微孔浓度的条件下，在CSTR中进行乙酸乙烯酯的乳液聚合时，在时间无关的稳态操作中达到的月转换在临界反应温度或平均停留时间的急剧上升幅度从0到60％以上。平均停留时间或反应温度在非态状态操作中的两个值之间进行交换，一个在通常的稳态操作中给出了零单体转换，另一个给出了零单体转换。周期性转换操作会诱导单体转换的振荡。粒度分布随开关操作同步变化。这项研究表明，可以通过调整……更多的频率和/或平均停留时间或反应温度临时变化的频率和/或放大器来控制粒径分布。这项研究发现，即使恒定的单体转换保持在稳态状态，粒度分布也以很长的时间振荡。这项研究表明，振荡是通过聚合反应与乳胶颗粒聚集之间的竞争相互作用而发生的。为了改变乳胶颗粒的胶体稳定性，在某些情况下添加了非离子表面活性剂。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，在串联的两个连续醒目的坦克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旋转速度和平均停留时间来控制。使用两个CSTR进行的研究表明，可能产生各种多分散的乳胶颗粒。较少的

项目成果

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）。

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

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。

N.Ohmura: "Effect of Inhomogeneous Mixing on Chemical Reaction in a Taylor Vortex Flow Reactor"Journal of Chemical Engineering of Japan. Vol.35・No.7. 692-695 (2002)

N.Ohmura：“泰勒涡流反应器中的不均匀混合对化学反应的影响”日本化学工程学报第35卷·第7期（2002年）。

K.Kataoka: "Effect of Nonlinear Coupling between Transport and Reaction Dynamics in Polymerization Processes"Proceedings of 13^<th> International Symposium on Transport Phenomena, Canada. 491-496 (2002)

K.Kataoka：“聚合过程中传递和反应动力学之间的非线性耦合的影响”第13届国际传递现象研讨会论文集，加拿大。