本研究以SDS作為界面活性劑，Na2S2O8為起始劑，MMA或ST為單體進行迷你乳化聚合反應，改變可聚合共同安定劑( SMA )的濃度，探討SMA的濃度對迷你乳化共聚合反應動力學的影響。隨著SMA濃度上升，單體與可聚合共同安定劑之個別轉化率皆隨之下降，而反應結束後所得之乳漿高分子產品之平均粒徑也隨之增大。
藉由反應活性比的計算，可知單體MMA或ST與可聚合共同安定劑都傾向生成均聚物，故此共聚合反應是傾向偏離形成雜亂共聚體甚或形成團聯共聚物。而由實驗結果可證明在反應中加入SMA確實是可以提升高分子表面之疏水性，其中當SMA content = 33.3 % 時，乳漿高分子表面已能充份展現SMA之高疏水特性。由於乳漿高分子鏈組成不均勻性以及親疏水性的不同，造成乳漿高分子塗膜於基材上，為了重新適應固-氣界面的轉換，造成兩相分離造成偏差程度，使得原本較親水之單體MMA反應所得之乳漿高分子塗膜因兩相分離程度較大比原本較疏水單體ST反應所得之乳漿高分子更為疏水。所以可知道影響接觸角的效應不僅僅依據乳漿高分子組成與表面的偏差程度大小，與SMA單體單元之含量也是決定接觸角的主因之一。

This research takes sodium dodecyl sulfate ( SDS ) as surfactant, Na2S2O8 as the initiator, MMA( or ST ) as the monomers in the miniemulsion polymerization, changes the costabilizer ( stearyl methacrylate, SMA ) concentration, discusses the influrnce of the SMA concentration on the miniemulsion polymerization kinetics. With the increased SMA concentration, the individual conversion rate of the monomer and costabilizer all drop, but after the copolymerization is complete, the average diameter of the emulsion polymer products all increases.
Because of the different reactivity ratios, MMA ( or ST ) and SMA tend to undergo homopolymerization. Therefore the copolymerization tends to form block copolymer. The copolymerization of MMA ( or ST ) with SMA promotes the hydrophobicity of the polymer surface. When SMA content = 33.3%, the emulsion polymer surface shows a relatively high hydrophobic characteristic. As a result of the nonuniformity emulsion polymer chain composition and different hydrophobicity, phase separation occurs during film formation. This result in emulsion polymer with MMA that is more hydrophobic than the ST counterpart. This is confirmed by the contact angle and ESCA measurements.

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