本研究是利用聚對苯二甲酸乙二醇酯-1,4-環己烷二甲醇酯(Poly (ethylene terephthalateco-1,4-cylclohexylenedimethylene terephthalate)及乙烯醋酸乙烯酯(Ethylene-vinyl acetate)加入發泡母粒製備成複合型發泡薄膜，以研究複合薄膜結構及發泡對於光學性質及聲學性質之影響。
實驗上先針對所使用之原物料通過熱性質及流變行為分析如熱重損失(TGA)、示差掃描量熱(DSC)、熔流指數(MFI)及迴轉式流變儀(MCR)等分析，參考分析後之數據，以作為後續加工參數之依據及限制。樣品製備方面則以三軸共押出機使用共押出之方式，參考原物料材料分析之性質，歸納出適合之加工參數。製備之樣品則以內層為添加發泡母粒之乙烯醋酸乙烯酯(EVA)作為彈性層，剛性較高之聚對苯二甲酸乙二醇酯-1,4-環己烷二甲醇酯則作為外層。
所製備之樣品厚度為90~100μm，符合微型揚聲器所使用振膜之規格，經由拉伸實驗分析力學性能，可以得知其在後續可承受的使用範圍以及材料剛性。藉著光學及聲學儀器分析，探討薄膜材料、複合薄膜結構比例及發泡對於光學及聲學之影響性。

The study is the use of poly (ethylene terephthalateco-1,4-cylclohexylenedimethylene terephthalate and ethylene-vinyl acetate that added a chemical foaming agent to prepare the foaming co-extruded composite film then to research the influences of composite film foaming structure for optical and acoustic properties.
The first experiment for the raw materials used in the analysis such as thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), melt flow index (MFI) and rheometer (MCR) analyzed by thermal properties and rheological behavior , the reference data analysis, as a basis for processing parameters and limitations. Sample preparation using a triaxial co-extrusion machine with reference of the raw materials materials analysis summarized for the processing parameters. Sample preparation for the addition of the foaming masterbatch inner places of ethylene vinyl acetate (EVA) as an elastic layer, a high rigidity of polyethylene terephthalate is cyclohexane-1,4-dimethylene terephthalate as outer layer.
The thickness of the the prepared samples are 90 ~ 100μm conformed to the specifications of the diaphragm micro-speaker. By analyzing the mechanical properties of tensile test, you can learn its rigidity and affordable range in use. By optical and acoustic instrumental analysis, to explore film materials, composite film and foam structure of the proportion of the optical and acoustic impact resistance.

Keywords: speakers, diaphragm, backlight, the proliferation of film, haze, triaxial co-extruser, polyethylene terephthalate 1,4-cyclohexanedimethanol acetate, ethylene vinyl acetate, rigidity, Young's modulus

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