設施農業：節能栽培與滅菌【化工系陳志銘特聘教授】
論文篇名 英文：Efficient and Adhesiveless Metallization of Flexible Polyimide by Functional Grafting of Carboxylic Acid Groups
中文：羧酸基功能性接枝軟性聚醯亞胺於無膠之高效金屬化
期刊名稱 Langmuir
發表年份,卷數,起迄頁數 2019, Vol. 35, Issue 22, pp. 7212-7221
作者 Tzu-Jung Liu, Chien-Han Chen, Pei-Yu Wu, Ching-Hsuan Lin, Chih-Ming Chen
DOI 10.1021/acs.langmuir.9b00354
中文摘要 聚醯亞胺的表面金屬化是製備軟性印刷電路板的關鍵製程。為了滿足小型化的需求，必須通過去除中間黏合劑層來實現軟性印刷電路板的超薄化。普通的無黏合劑工藝依賴於疏水性聚醯亞胺通過鹼水解的表面活化，以生成用於金屬沉積的親水性羧酸根陰離子活性點。然而，鹼性水解過程涉及由於強親核試劑的攻擊而導致的醯亞胺環斷裂，從而導致聚醯亞胺的機械破壞和表面粗糙化。在本研究中，合成一種新的聚醯亞胺，以羧酸基團的接枝為活性位點，進而固有地活化了聚醯亞胺以進行有效的金屬化。表面活化是通過在稀鹼環境中進行酸鹼中和反應來完成，這可以抑制鹼水解反應。衰減全反射傅里葉變換紅外光譜分析證實了羧酸接枝的聚醯亞胺膜中醯亞胺環裂解程度的顯著降低。根據穿透式電子顯微鏡的顯微結構檢查，羧酸接枝的聚醯亞胺膜與沉積金屬層之間存在內部固鎖效應，而此效應與花椰菜狀的沉積奈米簇層有關。
英文摘要 Surface metallization of polyimide (PI) is the key process for the preparation of flexible printed circuit boards (FPCBs). To meet the miniaturization demand, the ultrathinness of FPCB by the removal of the intermediate adhesive layer is imperative. The common adhesiveless process relies on the surface activation of hydrophobic PI through alkaline hydrolysis to generate the hydrophilic carboxylate anion sites for the metallic deposition. However, the alkaline hydrolysis process involves the imide ring cleavage caused by the attack of a strong nucleophile (OH–), resulting in mechanical destruction and surface coarseness of PI. In this study, a new PI is synthesized with the grafting of carboxylic acid groups as the active sites to intrinsically activate PI for efficient metallization. The surface activation is accomplished through an acid–base neutralization reaction in a dilute alkaline environment, which can suppress the alkaline hydrolysis reaction. The attenuated total reflection Fourier transform infrared spectroscopy analysis confirms a significant reduction of the extent of the imide ring cleavage in the carboxylic acid-grafted PI films. According to the microstructural examination using transmission electron microscopy, the deposited metal film adheres firmly to the carboxylic acid-grafted PI films through an interlocking effect of a broccoli bud-shaped nanocluster layer.