臺灣博碩士論文加值系統

本文主旨在發展一導電性複合材料之製程方法，以期應用於靜電放電與電磁波屏蔽材料。採用DREFШ開端摩擦式精紡機紡製不銹鋼/ Kevlar 49導電包芯紗，再經由環錠撚線機撚合成雙股紗之型態；並採用此導電包芯紗為羅紋緯編針織物之緯向夾入原料，芳香族聚醯胺纖維為針圈用紗，以織製成羅紋針織物夾入結構。並以不飽和聚酯為基材經由手積層法製成具電磁波遮蔽性質之針織物補強複合材料，以探討其表面電阻係數、導電率、電磁波屏蔽效益、靜電放電電壓等電氣性質及拉伸、彎曲、衝擊等機械性質，及其破損行為。
由實驗結果顯示，交叉積層方式較水平積層者具有較佳之電磁波屏蔽效益，且隨羅紋夾入針織物結構中導電包芯紗夾入量與積層數之增加，導電性緯編針織物補強複合材料的導電率、電磁波屏蔽效益及靜電放電電壓衰減率有增加之趨勢，對表面電阻係數則有漸減之趨勢。在機械性質方面，導電性緯編針織物補強複合材料的拉伸強度主要取決於夾入紗的多寡；而針圈紗含量則對衝擊強度有較大的影響。利用顯微鏡作破損分析可進一步了解材料之破壞機制，並與複合材料之應力應變曲線作比較則可推斷出材料之破壞歷程。

This thesis reports a study to develop a fabrication
method of conductive composites for shielding the electrostatic discharge and electromagnetic properties. To facilitate knitting of stainless steel and to reduce the material cost, initially conductive yarn was made from 0.1 mm stainless steel wire, Kevlar 49 and stainless steel sliver, produced by DREF III open-end friction spinning method. Furthermore, two conductive yarns were twisted by the ring twister to form a conductive ply yarn. Kevlar 49/stainless steel conductive core-spun yarn was used as the inlaid yarns and Kevlar 49 filament yarn with 1140d as the loop yarn for fabricating the rib inlaid knitted fabrics, which are made from 5G traverse knitted machine. Furthermore, the inlaid knitted fabric reinforced unsaturated polyester composites are made by the hand lamination with electromagnetic shielding effectiveness to investigate their electrical (surface resistivity, conductivity, electromagnetic shielding effectiveness, electrostatic discharge voltage), and mechanical (tensile, flexural and impact) properties.
It has been showed that the composites with cross lamination have better electromagnetic shielding effectiveness (EMSE) than the parallel lamination. The electrostatic discharge (ESD), conductivity and EMSE of the composites increase with increasing ends of the inlaid yarn. The surface resistivity of the composites decrease with increasing the inlaid end. Regarding the mechanical properties of the composites, the tensile strength of the composites to be decided by inlaid ends and more loop yarn fraction volume has the significant influence for impact strength.
Making use of the microscopic examination of the fracture behaviors can further understand the fractured mechanism, the referential comparison by the stress-strain curve of composites can predict the fracture process.

中文摘要......................................................i
英文摘要.....................................................ii
誌謝.........................................................iv
目錄..........................................................v
表目錄......................................................vii
圖目錄.....................................................viii
第一章 緒論..................................................1
1.1 前言.................................................1
1.2 靜電放電與電磁相容...................................3
1.2.1 靜電放電.......................................3
1.2.2 電磁干擾.......................................6
1.2.3 電磁波屏蔽材料文獻回顧........................11
1.3 緯編結構複合材料....................................13
1.3.1 緯編結構複合材料文獻回顧......................14
1.4 不飽和聚酯聚合反應回顧..............................15
1.5 研究目的............................................19
第二章 理論.................................................20
2.1電磁波屏蔽理論.......................................20
2.1.1 固態屏蔽理論..................................21
2.1.2 非固態屏蔽理論................................24
2.2複合材料破壞理論.....................................26
2.2.1 紗於成圈過程所受彎曲應力之理論................26
2.2.2 複合材料破壞理論..............................28
2.2.3 複合材料衝擊強度理論..........................29
第三章 實驗.................................................33
3.1實驗材料.............................................33
3.2實驗設備.............................................35
3.3實驗流程.............................................36
3.3.1 導電性複合紗製備..............................37
3.3.2 緯編夾入針織物製備............................38
3.3.3 導電性複合材料製備............................40
3.4測試方法.............................................42
3.4.1 表面電阻係數及導電率..........................42
3.4.2 靜電放電電壓衰減..............................43
3.4.3 電磁波屏蔽效益................................45
3.4.4 落錘式衝擊試驗................................46
3.4.5 拉伸試驗......................................47
3.4.6 彎曲試驗......................................48
3.4.7 破壞及結構分析................................49
第四章 結果與討論 ...........................................50
4.1改變導電性緯編夾入針織物補強複合材料之組成與結構對表面
電阻係數及導電率之影響...............................50
4.2改變導電性緯編夾入針織物補強複合材料之組成與結構對靜電
放電電壓衰減之影響...................................54
4.3改變導電性緯編夾入針織物補強複合材料之組成與結構對電磁
波屏蔽之影響.........................................56
4.4改變導電性緯編夾入針織物補強複合材料之組成與結構對落錘
衝擊之影響...........................................62
4.5改變導電性緯編夾入針織物補強複合材料之組成與結構對拉伸
性質之影響...........................................66
4.6改變導電性緯編夾入針織物補強複合材料之組成與結構對彎曲
性質之影響...........................................72
4.7導電性緯編夾入針織物補強複合材料之破壞及結構分析.....76
4.7.1 金相顯微鏡照相圖..............................76
4.7.2 實體顯微鏡照相分析............................77
第五章 結論.................................................85
參考文獻.....................................................82
附錄
符號彙編.................................................92

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