近年來，可攜式行動通訊裝置普及化，智慧型手機、平板電腦等，已成為人手一機的巨大市場，隨著高科技電子產品的蓬勃發展，內部零件的品質提升也相對重要，其中可撓性電路基板所使用之膜材目前以聚醯亞胺樹脂(PI)為主，但其吸水率、介電特性等性質在高頻下表現不佳，另一種特殊工程材料”液晶高分子(Liquid Crystal Polymer,LCP)”在高頻傳輸下吸水率、介電常數、耐熱性等表現較為優異，但成本也較高。由於LCP其分子結構呈現無糾纏剛直棒狀，造成其熔融強度極低，使其難以在淋膜及吹膜等需要高熔融強度的薄膜製程中加工。而LCP其分子結構呈剛硬鏈段，熔膠流動時會沿著剪切方向排列，形成強烈的配向性(Anisotropic)，此順向性造成了LCP成膜後，薄膜MD與TD方向的特性差異極大，強度分布不均。
本研究使用具有橫向延伸特性的吹膜製程來製作LCP薄膜，而LCP熔融強度低，在單層吹膜製程中成膜性非常差，因此本研究使用三層共擠押吹膜製程以A/B/A內外層包覆帶起中間層的方式，利用HDPE高熔融強度的特性將LCP帶起並協助其成膜，其內外包覆的效果可使LCP冷卻速度降低，解決LCP過早冷卻造成製程困難的問題，且因PE與LCP不相容的特性，吹製後的三層薄膜可輕易分離，最終取得LCP薄膜。
本研究也利用了吹脹法、熱壓二次加工法，嘗試讓薄膜配向達到雙向延伸，實驗結果顯示，吹脹法效果有限，熱壓二次加工法改變配向角度，配向夾角角度愈大，MD方向抗拉強度愈小，TD方向愈大，配向夾角角度到達90度時，MD與TD方向抗拉強度趨近相同。

In recent years, portable mobile is popular, including smart phones, tablet PCs, it’s a big market value in world. With the development of high-tech electronic products, the quality of parts in mobile is more and more important ,the main film material of flexible printed board in mobile is PI(Polyimide) until now, but the Water absorption and Dielectric properties of PI is poor in high frequency. the other material”Liquid Crystal Polymer” ,it’s Water absorption and Dielectric properties is better than PI,but it’s price is also higher than PI. Cause the molecular structure of LCP is ramdomly and have rigid rod molecular, make LCP have extremely low melt viscosity,this characteristic make LCP difficult to process in film laminating and blowning. Since the molecule of LCP is rigid, the rigid-rod molecules are easily aligned in the same direction of the shear stress, and be strongly oriented in one direction(Anisotropic), Anisotropic make LCP flim strength have a big difference between transverse(TD) and machine direction(MD),therefore, making biaxially-oriented LCP film and stably has became trend.
This study use Extrusion to make LCP film, because the Anisotropic, this study use film blowing which processing have transverse direction extension, LCP have extremely low melt viscosity, it’s hard to blowing nd become film, therefore, this study use Three-layer co-extrusion blown film machine, use A/B/A method, let HDPE be inside and outside layer、LCP be middle layer, HDPE has high melt viscosity can carry LCP and support LCP become film, he HDPE layer can reduce the cooling speed of LCP layer, make the processing easy, by the way, LCP and HDPE is incompatible, so the 3 layer film can separate easily, than get the LCP film.
This study use Inflate(blowing)、Thermoforming, make the LCP film
Biaxially, the result shows Inflate is not very effective,； Thermoforming transform the orient angle,the bigger of the angle,the MD tensile strength smaller, the TD tensile strength bigger,if the orient angle become 90∘,MD and TD tensile strength close to the same。

目錄

摘要 I
ABSTRACT II
誌謝 IV
目錄 V
圖目錄 VII
表目錄 XI
第一章 緒論 1
1.1 前言 1
1.2 研究動機與目的 4
1.3 液晶高分子(LCP)介紹 5
1.3.1 液晶高分子類型 5
1.3.2 液晶高分子之特性 8
1.4 LCP薄膜應用與未來趨勢 10
1.5 論文架構 12
第二章 、文獻回顧與基本原理 13
2.1 LCP流變性質與薄膜加工製程 13
2.1.1 LCP流變性質 13
2.1.2 薄膜加工製程 15
2.2 押出機塑料塑化原理 23
2.2.1 螺桿介紹 23
2.2.2 螺桿壓力及塑化曲線原理 25
2.3 押出模頭介紹與原理 28
2.4 三層共擠押吹膜原理 32
第三章 實驗步驟 36
3.1 實驗規劃 36
3.2 實驗材料與設備 38
3.2.1 毛細管流變儀及DSC差示掃描熱檢測 38
3.2.2 儀器設備 40
3.3 薄膜製備分析流程 41
3.3.1 分析材料建立 42
3.3.2 三層共擠押吹膜外型與製程參數設定 43
3.4 LCP薄膜製備步驟 51
3.5 成品檢測方法 55
第四章 結果與討論 58
4.1 內外層包覆材料選用結果 58
4.2 模擬分析結果與討論 62
4.3 薄膜製備結果 71
4.4 薄膜MD、TD方向抗拉強度結果 73
第五章 結論與未來展望 77
5.1 結論 77
5.2 未來展望 78

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