• 作者： 吳順昭; 汪淮; 王秀華
• 作者服務機構： 國立臺灣大學森林學研究所; 國立屏東農業專科學校木材工業科
• 中文摘要： 本研究藉掃描式電顯－－電子微探儀技術，比較銀合歡蘇打蔥?及硫酸鹽半化學法蒸解各階段，細胞壁微細部位之
  木質素移除變異性，並以X射線繞射技術探討紙漿纖維素之結晶度變化。兩種製漿方法對纖維細胞壁各壁層之去木質素
  層次化學反應有所不同，蔥?添加於蘇打藥液中，對細胞角落處和中膠層之去木質素有顯著效果，尤以前者為然。其於
  次生壁木質素之移除自蒸解初始至反應終了幾乎維持同一緩慢速率。硫酸鹽藥液對細胞壁各部位之作用，隨蒸解之啟始
  同時發生，與次生壁之反應尤其迅捷，蒸解進行至30～95分鐘之階段，細胞壁三部位（次生壁，中膠層和角落處）之木質
  素幾以相同速率移除。因此，中膠層於硫酸鹽半化學法蒸解終了，仍含相當高濃度之木質素而次生壁者幾乎移除盡淨。
  經高溫處理之半化學紙漿，纖維之分離處不一定發生於中膠層周遭，亦可能於間而使次生壁露出於外，硫酸鹽
  藥液蒸解結果，次生壁之木質素含量較蘇打蔥?者低，抄紙時有利水合作用及氫鍵之產生，或為其紙力較優之原因。不
  論蘇打蔥?或硫酸鹽藥液蒸解所得銀合歡半化學紙漿α纖維素之主要結晶平面與蒸解前者十分近似，然兩種製程之結晶
  度變化迥然不同。顯示其對碳水化合物之作用機構有相異之處。
  本報告係“銀合歡高收率製漿之研究”系列中之第三報。d
• 英文摘要： The kinetics of lignin removal in the various morphological regions were studied by comparing thebromine concentration with the SEM-EPMA technique. The topochemistry of delignification in differentcell wall regions was obviously different between Soda-AQ and the kraft process. The addition of AQ re-sulted in a faster lignin removal from cell corner and middle lamella areas than from the secondary wall,especially during the initial pulping stage. The delignification rate of Soda-AQ liquor in the secondary wallwas almost constant throughout the whole process, while lignin composition in middle lamella and cellcorner areas was removed with great rapidity during the last 50 minutes. Since lignin degradation in thesecondary wall was much slower than that from the middle lamella region, consequently the secondary wallstill maintains an appreciable amount of lignin at the end of cooking. On the other hand, kraft liquor wasmuch more selective in removing lignin from the lumen side, although both the lumen side and intercellularregions were found to be attacked in the initial stage. The delignification rates at cell corner, middle lamellaand the secondary wall were quite comparable during 30 to 95 minutes cooking. Since the secondary wallis more than ten times thicker and has much lower lignin concentration than the middle lamella region, itturns our that a small amount of lignin remains at the end of kraft pulping. Lattice planes of Leucaena α cellulose were not altered by alkaline pulping, no matter Soda-AQ orkraft. The crystallinity index, however, increases with the increasing cooking time in Soda-AQ process. Asto kraft cooking, the crystallinity of α cellulose was raised by 3-4 per cent at first then gradually decreasedand resulted in a little smaller crystallinity than the uncooked sample. This paper is part 3 of the whole series entitled "Studies on the High Yield Pulping of Leucaena".
• 中文關鍵字： delignification; SEM-EPMA; cell corner; middle lamella; secondary wall; lignin frag-ments; crystallinity
• 英文關鍵字： --