本論文主要是探討半批式STY/2-EHA乳化聚合反應中乳漿粒子大小的變化與安定性的問題，並且以非離子型界面活性劑在起始反應器中（IRC）和在乳化單體進料（MEF）之濃度作為變數加以討論粒子的相關效應。隨著STY占總單體之重量比增加而粒徑會減少，當重量比大於10% 則粒徑尺寸會趨於穩定。界面活性劑在成核時期的濃度不但占了最重要的地位，並且也是決定粒子大小和粒徑分佈的重要變數。實驗結果顯示，隨著界面活性劑的濃度提高，粒子粒徑會隨之降低，而影響的程度以非離子型界面活性劑（#5105）最為重要，另外非離子型界面活性劑（D-400E及#5091）濃度的改變對粒徑影響不大，但都有保護膠體維持安定性的功能。
關於乳漿粒子安定性方面，實驗數據顯示不同的非離子型界面活性劑對乳漿粒子的安定性影響程度不一樣。隨STY占總單體之重量比提高或界面活性劑濃度的提高，濾渣量皆會隨之減少。非離子型界面活性劑影響的程度也是以在起始反應器中的#5105最為重要，另外D-400E及#5091濃度的改變對安定性也有些微影響。
關於不同分子量的含聚乙二醇非離子型界面活性劑方面，由Mackor理論預測，非離子型界面活性劑對於乳漿的保護能力隨著其鏈長增長而加強，實驗結果也完全符合其理論，但對於單體為STY的乳化聚合並非如此，我們嘗試以動力學實驗配合濾渣、固成份含量之數據尋找其與粒徑及安定性的關係，並解釋現象產生的原因。

This study deals with the problems of latex particles size control and stability for semi-batch styrene/2-ethylhexyl acrylate emulsion polymerization. The effects of the type and concentration of non-ionic surfactants in the initial reactor charge and the monomer emulsion feed are the major focus of this work. The particle size decreases with increasing the weight ratio of styrene in total monomer weight. When the
weight ratio of styrene greater than percent of ten, the particle size variation is not evident. The concentration of surfactant during the particle nucleation period plays an important role. Experimental data show that the particle size decreases with increasing the concentration of surfactants. But the concentration of non-ionic surfactant (#5105) is the most important parameter. Moreover, changing the concentration of non-ionic surfactants (D-400E and #5091) do not change the particle size significantly, but the surfactants protect the colloid and maintain particle
stability.
About latex particle stability, we measure the amount of scrap to analyze the relationship between three variables and particle stability. Experimental data show that the latex particle stability depends on the type of non-ionic surfactants. The concentration of surfactant increases with decreasing the amount of scrap. The influence the non-ionic surfactant (#5105) in the initial reactor is significant. Moreover, the slight influence of the concentration of nonionic surfactant (D-400E and #5091)
on the latex stability was observed.
About the different molecular weight non-ionic surfactants having the poly(ethylene glycol) structure, the capability of non-ionic surfactant in protecting particles increases with increasing length of the polymer
chain.

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