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Structural Changes of Lignin During TCF Bleaching of Kraft Pulp from the Triploid of Polulus Tomentosa

ZHANG Chun-jing,LIU Yu,WANG Zhen,DONG Li-bin,CHENG Ze-sheng(Key Laboratory of Pulp and Paper Science and Technology of Ministry of Education,Shandong Polytechnic University,Ji'nan 250353,China)  
The kraft pulp of the triploid of polulus tomentosa was obtained and pretreated.Then the TCF bleaching process of OQP was carried out.The brightness of the bleached pulp reached 82%ISO.The two-stage method was applied to isolate the residual lignin samples from kraft pulps before bleaching,kraft pulps after oxygen deliginification stage and kraft pulps after preroxide bleaching stage,respectively.The lignin samples were determined by gel permeation chromatography.The changes of molecular weight distributions,the number-average and weight-average molecular weights during TCF bleaching were analyzed and compared.The 31P-NMR spectra of all the lignin samples were obtained.The functional groups within lignin were quantitatively analyzed and compared to discover the rules of lignin structural changes during the TCF bleaching process.
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