：本研究以陽離子界面活性劑 (十六烷基三甲基溴化銨, CTAB)或
其與非離子界面活性劑之混合物當作乳化劑， 以2,2’-azobis
(2-amidinopropane) dihydro- chloride (AAP) 當作起始劑，進行苯乙烯乳
化聚合，順利製備安定乳液。以皂滴定法測出CTAB 在粒子上之分子面
積為52+3 (Å2)。CTAB 安定乳液之能力與溴化十六烷基吡啶 (CPB， 陽
離子界面活性劑)，十二烷基硫酸鈉 (SDS,陰離子界面活性劑) 相當。實
驗顯示乳化劑對粒子表面之遮蓋率與膜厚皆隨乳化劑含量之增加而增
加。起始劑含量增加亦造成較高之粒子成核機會。

Stable latexes were prepared from the emulsion polymerization
of styrene, using 2,2’-azobis(2-amidinopropane) dihydrochloride (AAP) as
the initiator. The cetyltrimethylammonium bromide (CTAB, a cationic
surfactant), or a mixture of CTAB and a nonionic surfactant (NS) was used
as the emulsifier. The molecular area (Am) of CTAB was determined to be
52+3 (Å2) by the soap titration method. The CTAB shows a similar
stabilizing effect as those of cetylpyridinium bromide (CPB,cationic
surfactant) or sodium dodecyl sulfate (SDS, anionic surfactant). The study
reflects that both the fraction of particles surface area packed by and the
normal extension on particle surface of surfactant molecules increase with
increasing the surfactant content. Increasing the initiator content also leads
to the higher chance of particle nucleation.