04392nas|a2200541 a 4500 20260818095117.0 100901s2007 th uu|m rtt 0| a1eng d .b1208220x AIT Thesis no.PP-07-12 Kumar, Devendra Effect of the hexenuronic acid group on paper making properties of bleached Eucalyptus camaldulensis pulp Pathum Thani, Thailand : Asian Institute of Technology, 2007 59 leaves : ill. Thesis ; no. PP-07-12 A thesis submitted in partial fulfillment of the requirements for the degree of Master of Science in Pulp and Paper Technology Thesis (M.Sc.) - Asian Institute of Technology, 2007 Eucalyptus camaldulensis wood chips were cooked to kappa number of 19.6 and 82.2 meq/kg HexA content by kraft pulping. Total carboxylic acid in unbleached pulp was 121.4 meq/kg and HexA group contributed about 68% of the total carboxylic acid content. The unbleached pulp was oxygen delignified and bleached to fu ll 90-92% ISO brightness. The bleaching sequence of Do(EOP)D1was found efficient to produce low HexA content of 3.7 meq/kg of pulp and Q(PO)DQ(PO) produced high HexA content of 10.4-49.7meq/kg of pulp. HexA did not show any effect on brightness reversion. Chlorine dioxide reduced effectively HexA group in pulp, oxygen and peroxide chemical were less reactive. Carboxylic acids group other than HexA group in pulp were not changed too much during the bleaching process and these acidic groups varied 33.7 to 41.9 meq/kg in bleached pulp. However, total carboxylic acid varied from 45.6 to 83.4 meq/kg. Fiber charge by both polyelectrolyte titration and conductometric titration method varied from 21.4 to 33.8 mmol/kg and 33.6 to 60.9 mmol/kg of pulp respectively. Higher HexA content in pulp produced high charge on the fibers. Higher HexA content up to some level in the pulp produced slightly better tear strength, Scott bond strength and stretch at the 50 to80Nm/g tensile index level than the low HexA pulp. Higher HexA pulp also produced better surface smoothness, formation and porosity. Considering all results, it might be stated that higher HexA content in pulp could improve its papermaking properties, although the effects are small. Papermaking Chemistry Eucalyptus camaldulensis Malinen, Raimo O., Chairperson Nazhad, Mousa M., Examination Committee Lehtinen, Esa, Examination Committee Finland, Scholarship Donor AIT Fellowship, Scholarship Donor Asian Institute of Technology. Thesis ; no. PP-07-12 Full-Text http://203.159.5.9/ait-thesis/detail.php?q=B11310 .b1208220x mnait u 240329 0 100901 m a u 0 mnait mnait store store store store mnarc 20 22 40 Barcode : 30050120932750 CREATED : 2010-01-09 RECORD # : i12643312 LPATRON : 0 LCHKIN : - # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 0 TOT RENEW : 0 Barcode : 30050120651954 CREATED : 2014-05-26 RECORD # : i1280311x LPATRON : 0 LCHKIN : - # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 0 TOT RENEW : 0 Barcode : 30050160026521 CREATED : 2016-03-18 RECORD # : i12897231 LPATRON : 0 LCHKIN : - # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 0 TOT RENEW : 0 Barcode : 30050121018831 CREATED : 2020-08-29 RECORD # : i13292067 LPATRON : 0 LCHKIN : - # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 0 TOT RENEW : 0 Barcode : 30050121018849 CREATED : 2020-08-29 RECORD # : i13292079 LPATRON : 0 LCHKIN : - # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 0 TOT RENEW : 0 Barcode : 30050121018856 CREATED : 2020-08-29 RECORD # : i13292080 LPATRON : 0 LCHKIN : - # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 0 TOT RENEW : 0 Barcode : 30050121018864 CREATED : 2020-08-29 RECORD # : i13292092 LPATRON : 0 LCHKIN : - # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 0 TOT RENEW : 0 34733 34733 0 0 0 0 MAIN MAIN mnait 2026-08-18 50.00 0 AIT Thesis no.PP-07-12 30050120932750 2026-08-18 09:51:17 1 2026-08-18 20 0 0 0 0 MAIN MAIN store 2026-08-18 50.00 0 AIT Thesis no.PP-07-12 30050120651954 2026-08-18 09:51:17 3 2026-08-18 22 0 0 0 0 MAIN MAIN mnarc 2026-08-18 0 AIT Thesis no.PP-07-12 30050160026521 2026-08-18 09:51:17 2026-08-18 40 0 0 0 0 MAIN MAIN mnait 2026-08-18 0 AIT Thesis no.PP-07-12 30050121018831 2026-08-18 09:51:17 2 2026-08-18 20 0 0 0 0 MAIN MAIN store 2026-08-18 0 AIT Thesis no.PP-07-12 30050121018849 2026-08-18 09:51:17 4 2026-08-18 20 0 0 0 0 MAIN MAIN store 2026-08-18 0 AIT Thesis no.PP-07-12 30050121018856 2026-08-18 09:51:17 5 2026-08-18 20 0 0 0 0 MAIN MAIN store 2026-08-18 0 AIT Thesis no.PP-07-12 30050121018864 2026-08-18 09:51:17 6 2026-08-18 20