摘要
对杨木、杉木、枫木3种漂白化学热磨机械浆(BCTMP)进行了人工加速光诱导返黄,比较分析了3种BCTMP返黄特性;利用红外光谱和拉曼光谱相结合分析揭示光诱导条件下BCTMP浆料中官能团结构的变化和光诱导返黄机理.试验结果表明:在特定的光诱导条件下,BCTMP白度呈下降趋势,PC值则不断增大,3种BCTMP出现不同程度的返黄现象,杉木BCTMP返黄情况最为严重;红外图谱1635cm-1处碳-碳双键和α-酮羰基相对吸收强度增加,表明BCTMP在光诱导过程中产生了更多的碳-碳双键和α-酮羰基结构,从而产生发色基团引起BCTMP返黄;光诱导返黄后,BCTMP拉曼光谱1725cm-1处相对峰强增加,显示光诱导过程中产生了更多的羰基.综合红外光谱与拉曼光谱分析结果,光诱导过程中羰基和碳-碳双键基团的产生是引起BCTMP返黄的重要原因.
Poplar,fir and maple Bleached Chemical Thermal-Mechanical Pulps（BCTMPs） were accelerated aging by UV light,and the varieties of the yellowing property were studied.The objective of this paper was to identify the structure＇s change during the light-induced yellowing process by investigating the functional groups of BCTMPs and understand the light-induced mechanism of BCTMP using IR spectroscopy and Raman spectroscopy.The results showed that：with the illumination time extending,the brightness of BCTMP decreased,while PC number increased.And all the pulps appeared the same yellowing condition,though the fir pulp was more severe.The relative absorption of C=C bond and α-carbonyl at 1635cm-^1 increased after the treatment of illumination,indicated that the process of the light-induced progress produced more C=C bonds and α-carbonyl groups,resulting in more chromophores and bringing yellowing of BCTMP afterwards.The relative absorption of 1725cm^-1 band in Raman spectra increased after light-induced aging,indicated that the process of induction of light produced more carbonyls.Taken together,IR Raman spectroscopic studies indicated that C=C bonds and α-carbonyl structures are present in BCTMP,and these results suggested that there were yellowing initiating structures,and the carbonyl and ethylene groups were responsible for most of the yellowing in BCTMP.
出处
《应用基础与工程科学学报》
EI
CSCD
2011年第2期188-195,共8页
Journal of Basic Science and Engineering
基金
973计划支持项目(2010CB732206)
广东省产学研结合项目(2010B090400031)
关键词
红外光谱
拉曼光谱
BCTMP
光诱导返黄
IR spectroscopy
Raman spectroscopy
BCTMP
light-induced yellowing
