Sequence Distribution and Cumulative Composition of Gradient Latex Particles Synthesized by a Power-Feed Technique
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- 作者：Wenxing Yang ; Delong Xie ; Xinxin Sheng ; Xinya Zhang
- 刊名：Industrial & Engineering Chemistry Research
- 出版年：2013
- 出版时间：September 18, 2013
- 年：2013
- 卷：52
- 期：37
- 页码：13466-13476
- 全文大小：492K
- 年卷期：v.52,no.37(September 18, 2013)
- ISSN：1520-5045
文摘
Nonuniform latex particles, with a gradient change in composition between molecular chains, were prepared using a power-feed technique. The feed program of the addition process was quantitatively analyzed, and the corresponding equations were derived. A simple dropwise analysis model was established to simulate the sequence distribution and cumulative composition of gradient latex particles based on traditional free radical copolymerization. This model avoided consideration of the detailed kinetic procedure with great uncertainties in an emulsion polymerization. The apparent reactivity ratio of methyl methacrylate (MMA) and n-butyl acrylate (BA) during the emulsion copolymerization process, which was first measured by utilizing K-T, YBR, and other methods, and together with the conversion function, were used as the model parameters. 1H NMR and 13C NMR were used to characterize the experimental sequence distribution and cumulative composition to verify the model. The simulation results are in good agreement with the experimental data, and the model shows great tolerance to reactivity ratios calculated by different methods.