本研究以SDS作為界面活性劑，Na2S2O8為起始劑，MMA (或STY )為單體進行迷你乳化聚合反應，藉由改變共同界面活性劑SMA濃度，來探討SMA在聚合反應結束後，對乳漿高分子表面之接觸角變化，以暸解迷你乳化聚合反應是否可應用在生產疏水性材料。
以不同SMA /單體比例製備之乳漿粒子經甲醇清洗、塗佈成膜之高分子表面，隨著SMA含量的增加，接觸角隨之變大。其中當SMA /單體比例達1 / 2時，高分子表面已能充份展現SMA之高疏水特性。但SMA濃度再增加時，高分子表面之接觸角則趨一定值。若改以較疏水之單體STY進行迷你乳化聚合反應時，在高SMA含量所呈現之接觸角卻較MMA / SMA Copolymer小。聚合反應機構與塗佈成膜時親疏水分子鏈段排列之差異性，致使STY / SMA Copolymer反倒無法呈現較高之接觸角，高分子表面之疏水性不如預期。將乳漿產品分別以甲醇、超純水與未經任何清洗程序處理。未清洗之乳漿粒子，在高SMA 含量之高分子表面雖已具有疏水性，但接觸角受SDS分佈之影響，其error bar較大，而以甲醇清洗之乳漿粒子，其高分子更能呈現固有的高分子表面特性，發揮SMA 所具有的高疏水能力。

Miniemulsion polymerizations with different concentrations of cosurfactant (stearyl methacrylate, SMA) were used to synthesize a series of SMA / monomer ( MMA or STY ) copolymers. Sodium dodecyl sulfate (SDS) was used as the surfactant, sodium persulfate (Na2S2O8) as the initiator, and MMA (or STY) as the monomer. The copolymers were then coated and dried on microscope slide glasses and contact angles of water on these polymeric films measured by sessile drop technique. The contact angle increases with increasing the SMA content of emulsion polymers. When SMA / monomer ratio is equal to 1 / 2, the polymer surface showed a high hydrophobic property. When the SMA / monomer ratio is above 1 / 1, the contact angle then leveled off. On the other hand, if using a more hydrophobic monomer STY to synthesize STY /SMA copolymers, the contact angle is smaller than that of MMA / SMA copolymer at higher SMA contents. The difference of the reaction mechanism and mobility of polymer chains affected the contact angles. Finally, the contact angles of polymers that was washed by methanol, ultrapure water and no treatment were determined. Polymer surfaces in the absence of treatment exhibited more hydrophobic properties only at higher SMA contents. On the other hand, polymer surfaces treated by methanol presented intrinsic hydrophobicity of SMA and exhibited excellent water resistance.

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