中国林学(英文版)
中國林學(英文版)
중국림학(영문판)
FORESTRY STUDIES IN CHINA
2001年
1期
58-65
,共8页
杉木%压缩木材%γ射线辐射%固定%蠕变
杉木%壓縮木材%γ射線輻射%固定%蠕變
삼목%압축목재%γ사선복사%고정%연변
gamma irradiation%compressed wood%Chinese fir%fixation%creep
为了探讨木材压缩变定固定的机理,该研究对杉木压缩木材进行γ射线辐射处理,射线辐射剂量分别为0(作为对照试材),103,5×103,104,5×104,105,5×105,106,5×106 Gy,然后测定和讨论了γ射线辐射杉木压缩木材的重量损失率、平衡吸湿含水率(EMC)、吸湿回复率(RSA)和吸水回复率(RSW)、绝干状态下和吸湿解吸过程中的蠕变.该研究表明:γ射线的辐射剂量对杉木压缩木材的重量损失率、EMC、RSA、RSW有重要的影响,当辐射剂量超过106 Gy后,试材的重量损失率和EMC显著增大,RSA和RSW显著下降;另外,随着γ射线辐射剂量的增大,绝干状态和吸湿解吸过程中杉木压缩木材的瞬时柔量和蠕变柔量均呈增大趋势.从该研究结果可以推测,当γ射线辐射剂量较大时,特别当辐射剂量在5×106 Gy左右时,杉木压缩木材的细胞壁中发生了降解反应或非结晶化反应.而且,该研究证明了压缩木材细胞壁主成分发生的降解反应能够使木材压缩变定得到一定程度的固定.
為瞭探討木材壓縮變定固定的機理,該研究對杉木壓縮木材進行γ射線輻射處理,射線輻射劑量分彆為0(作為對照試材),103,5×103,104,5×104,105,5×105,106,5×106 Gy,然後測定和討論瞭γ射線輻射杉木壓縮木材的重量損失率、平衡吸濕含水率(EMC)、吸濕迴複率(RSA)和吸水迴複率(RSW)、絕榦狀態下和吸濕解吸過程中的蠕變.該研究錶明:γ射線的輻射劑量對杉木壓縮木材的重量損失率、EMC、RSA、RSW有重要的影響,噹輻射劑量超過106 Gy後,試材的重量損失率和EMC顯著增大,RSA和RSW顯著下降;另外,隨著γ射線輻射劑量的增大,絕榦狀態和吸濕解吸過程中杉木壓縮木材的瞬時柔量和蠕變柔量均呈增大趨勢.從該研究結果可以推測,噹γ射線輻射劑量較大時,特彆噹輻射劑量在5×106 Gy左右時,杉木壓縮木材的細胞壁中髮生瞭降解反應或非結晶化反應.而且,該研究證明瞭壓縮木材細胞壁主成分髮生的降解反應能夠使木材壓縮變定得到一定程度的固定.
위료탐토목재압축변정고정적궤리,해연구대삼목압축목재진행γ사선복사처리,사선복사제량분별위0(작위대조시재),103,5×103,104,5×104,105,5×105,106,5×106 Gy,연후측정화토론료γ사선복사삼목압축목재적중량손실솔、평형흡습함수솔(EMC)、흡습회복솔(RSA)화흡수회복솔(RSW)、절간상태하화흡습해흡과정중적연변.해연구표명:γ사선적복사제량대삼목압축목재적중량손실솔、EMC、RSA、RSW유중요적영향,당복사제량초과106 Gy후,시재적중량손실솔화EMC현저증대,RSA화RSW현저하강;령외,수착γ사선복사제량적증대,절간상태화흡습해흡과정중삼목압축목재적순시유량화연변유량균정증대추세.종해연구결과가이추측,당γ사선복사제량교대시,특별당복사제량재5×106 Gy좌우시,삼목압축목재적세포벽중발생료강해반응혹비결정화반응.이차,해연구증명료압축목재세포벽주성분발생적강해반응능구사목재압축변정득도일정정도적고정.
In order to discuss the mechanisms of permanent fixation of wood compression set, compressed wood of Chinese fir ( Cunninghamia lanceolata ) was irradiated by gamma rays from 60 Co. The irradiation doses were 0 (for match specimens), 10 3, 5 × 10 3, 104, 5 × 104, 105 , 5 × 10 5, 10 6, 5 × 10 6 Gy, respectively. Then the weight loss, the equilibrium moisture content (EMC), the recovery of wood compression set after adsorption (RSA) and the recovery after immersion in water (RSW), as well as the creep behaviour under a dry specimen condition and under an adsorption and subsequent desorption condition were measured and discussed. This re search proves that the doses of gamma irradiation have great effect on weight loss, EMC, RSA, RSW of irradiated compressed wood of Chinese fir. The weight loss and the EMC increase, the RSA and the RSW fall drastically when the irradiation doses exceed 106 Gy. Both the instantaneous compliance and the creep compliance of the irra diated specimens under the two measurement conditions show the general trend of increase with the increase of gamma irradiation doses. It can be deduced that decomposition or decrystallization reactions happen in the wood cell wall at high gamma irradiation doses, especially at doses of around 5 × 106 Gy. In addition, this research proves that decomposition of main components of cell wall of compressed wood will lead to fixation of compression set of wood to a certain degree.
