中文摘要
本文為塑膠複合材料電磁屏蔽效應之研究，以尼龍（Nylon, PA66）及液晶聚合物（Liquid Crystal Polymer, LCP E6000）為塑膠材料基礎，在不導電的塑膠材料中加入導電碳纖維，以形成導電塑膠複合材料，並對此複合材料研討電磁屏蔽之影響。本研究中分別在材料加入不同比例的長、短碳纖，及導電性複合材料進行電磁屏蔽效率之量測，探討塑膠填充導電纖維的長短、比例作材料導電率以及材料屏蔽效率定量的分析。製程中包括雙螺桿混合、壓縮成形、射出成形，並對於製作完成的成品作金相分析、導電率量測及纖維方向統計等。此外，並針對纖維的方向性分佈所造成的屏蔽效率變化做理論模型研究以及實際射出成形樣品的量測。
由實驗的結果，當尼龍中加入25%的碳纖時，在ASTM D4935-89規範的頻率範圍（30MHz∼1.5GHz）內，在低頻即可達到41dB的屏蔽效率，在高頻時更可達到59dB，而這已符合一般業界的應用所需。當改用液晶聚合物並加入同樣25%的碳纖做射出成形，使材料中的纖維方向能夠跟夾具入射電場方向平行時，更可提高屏蔽效率到51dB（低頻）及63dB（高頻）。因此比較尼龍與液晶聚合物兩種材料，加入較少量碳纖維即可使液晶聚合物具有較佳的屏蔽效應，此結果顯示液晶聚合物與添加較少量碳纖的組合，可降低塑膠封裝材料之成本，進一步降低光電傳輸模組之成本。

Abstract
Electromagnetic shielding of nylon-66 composites applied to laser modules was studied experimentally and theoretically. The effects of conductive carbon fiber length and weight percentage upon the shielding effectiveness (SE) of nylon composites were investigated. The result showed that the SE of long carbon fiber filled nylon-66 composites was found to be higher SE than short carbon fiber filled nylon-66 composites under the same weight percentage of carbon fibers. In addition, higher electromagnetic shielding was obtained for the composite with higher contents of carbon fibers at the same length. The SE of conductive carbon fiber filled nylon-66 composites was measured to be 41 dB at low frequency of 30 MHz and 59 dB at high frequency of 1.5 GHz. The results of SE predicted by the proposed theoretical model and the results measured by experiments were in good agreement with each other for carbon fibers filled nylon-66 composites of different lengths.
The effects of fiber orientation on SE of nylon and LCP composites were also investigated. The result showed that the SE of LCP composites was found to be higher than nylon composites under the same weight percentage of carbon fiber. This is due to that the fiber orientation in LCP composites attempts to keep the same direction.

內容目錄
中文摘要 Ⅰ
英文摘要 Ⅱ
致謝 Ⅲ
內容目錄 Ⅳ
圖表目錄 Ⅶ
第一章 導論 1
1.1 研究目的 1
1.2 論文架構 3
第二章 電磁屏蔽的理論分析 5
2.1 材料的吸收損失 6
2.2 材料的反射損失 10
2.3 塑膠導電原理 17
第三章 導電塑膠材料 23
3.1 材料製作 23
3.1.1 金屬蒸鍍 23
3.1.2 尼龍與長碳纖的複合材料製程 24
3.1.3 尼龍與短碳纖的複合材料製程 25
3.1.4 液晶聚合物與長碳纖的複合材料製程 26
3.2 製作方法 28
3.2.1 壓縮成形 28
3.2.2 射出成形 30
3.2.3 參考試片 33
第四章 屏蔽效率量測 44
4.1 量測架構 44
4.1.1 量測規範 45
4.1.2 量測系統 45
4.2 量測方法 46
4.2.1 儀器校正 47
4.2.2 量測步驟 49
4.2.3 量測資料分析 50
第五章 尼龍與碳纖複合材料 54
5.1 尼龍與長、短碳纖之金相分析 54
5.2 尼龍複合材料之屏蔽效率 55
5.3 導電率量測與屏蔽效率模擬 55
第六章 纖維方向與電磁屏蔽效率模型 69
6.1 模擬纖維方向圖形之製作思考 69
6.2 模擬纖維方向圖形繪製與電路板的蝕刻 69
6.3 量測結果討論 71
第七章 液晶聚合物與長碳纖複合材料 79
7.1 液晶聚合物與長碳纖之金相分析 80
7.2 屏蔽效率討論 81
第八章 結果與討論 87
附錄：參考書目 90
附錄一、使用材料及供應廠商 92
附錄二、材料特性 93

參考書目
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