頁籤選單縮合
題名 | 高溫乾燥對桂竹物理化學性質之影響 |
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作者姓名(中文) | 許建發; 吳金村; | 書刊名 | 林產工業 |
卷期 | 5:4 1986.12[民75.12] |
頁次 | 頁29-38 |
分類號 | 436.187 |
關鍵詞 | 物理化學性質; 桂竹; 高溫; 乾燥; |
語文 | 中文(Chinese) |
中文摘要 | 本試驗之目的,在於探究桂竹經不同溫度(氣乾、的、80、100及120℃)乾燥處理之物理化學變化。由各項物理性質測定及化學組成分分析結果,高溫乾燥之桂竹,比重顯著增加,而吸濕性則降低,顯示收縮應力與氫鍵結合之有效度增加。各化學組成分均具熱劣化性,尤以半纖維素最為顯著,其與剪力強度之降低具有密切關係。劈裂強度之提高,可能是由於木質素對收縮應力之紓解效應及氫鍵結合有妓度之改變所致。α-纖維素之結晶度有降低趨勢,而收縮應力之增加,有助於織維結構作較佳之排列狀態,此二者對引張強度之變化,具有互補效果。 |
英文摘要 | The purpose of this study was to investigate the physicochemical change of Makino bamboo ("Phyllostachys makinoi" Hay.) at different drying temperatures (Air-dried、60、80、100 and 120℃). After high temperature drying, their specific gravities were increased and hygroscopicities were decreased. These are due to increasing of shrinkage and changing in the availability of hydroxyl groups of cellulose. All chemical components were subjected to thermal degradation, but the hemicelluloses were degraded more than cellulose. Degradation of the hemicelluloses was considered to be closely correlated to the reduction in their shearing strength parallel to grain. The possibility of increasing cleavage strength perpendicular to grain was contributed by the effects of stress relaxation of lignin and hydrogen bonding. Complementary effects between the lowering crystallinity of α-cellulose and proper orientation of fiber structure could account for the variation in their tensile strength parallel to grain. |
本系統之摘要資訊系依該期刊論文摘要之資訊為主。