TEMPO/NaBr/NaClO氧化对纳米微晶纤维素性能的影响  

Effects of TEMPO/NaBr/NaClO-oxidation of Nanocrystalline Cellulose on Its Properties

作　　者：姚文润 徐清华[1,2] 靳丽强[1] 程正亮 高扬[1] 

机构地区：[1]齐鲁工业大学造纸科学与技术教育部重点实验室,山东济南250353 [2]陕西科技大学陕西省造纸技术及特种纸品开发重点实验室,陕西西安710021

出　　处：《林产化学与工业》2015年第2期31-37,共7页Chemistry and Industry of Forest Products

基　　金：国家自然科学基金资助项目(31370581);山东省科技发展计划资助项目(13fz02)

摘　　要：利用TEMPO/NaBr/NaClO体系对硫酸水解漂白硫酸盐浆制备的纳米微晶纤维素(NCC)进行改性制备氧化NCC(TONCC)。采用电导滴定、X射线衍射(XRD)及原子力显微镜(AFM)对改性前后纳米微晶纤维素的表面性能及形貌进行表征,并将其作为造纸增强剂应用于废新闻纸脱墨浆,研究其对浆料强度性能的改善作用。结果表明,TONCC表面引入大量的羧基(0.806 mmol/g),而NCC表面羧基含量仅为0.02 mmol/g,外观由半透明变为透明。TONCC保持了纤维素I的晶型结构,分散性能得到改善,宽度略有减小。将改性前后的纳米微晶纤维素加入到废新闻纸脱墨浆中,与对照样相比,当NCC和TONCC用量为0.6%时,浆料的抗张指数分别提高了8.7%和14.2%;NCC和TONCC用量为0.8%时,撕裂指数提高了约12%。将NCC和TONCC与CPAM联合使用,浆料的抗张指数得到了进一步提升,用量为0.8%时,抗张指数分别为17.35和18.52(N·m)/g,分别比对照样提高了19.6%和27.7%。Nanocrystalline cellulose （NCC） prepared by the acid-extraction of bleached hardwood kraft pulp （BHKP）, was oxidized by using TEMPO/NaBr/NaC10 at pH 10 to prepare TEMPO-oxidized NCC （TONCC）. The properties of NCC before and after oxidation were characterized by eonductimetric titration, X-ray diffraction （XRD） , and atomic force microscopy （AFM）. The resulting product was then applied in the deinked pulp, and its improvement in pulp strength was evaluated. It was found that TONCC maintained the crystalline form of cellulose I, and showed better dispersibility, smaller dimension and higher level of earboxyl content compared with NCC. With the addition of NCC and TONCC to the deinked pulp respectively, the tearing and tensile indexes increased while they were compared with that of the control. When the addition of NCC and TONCC was 0.6%, the tensile indexes were increased by 8.7% and 14.2%, respectively. When NCC and TONCC samples were applied together with cationic polyacrylamide （ CPAM）, tensile indexes of the deinked pulp were increased by 19.6% and 27.7% , respectively, in comparison with that of the control.

关 键 词：纳米微晶纤维素 TEMPO/Na Br/NaClO氧化 废新闻纸浆 增强 

分 类 号：TQ35[化学工程] TS75[轻工技术与工程—制浆造纸工程]