Abstract
Proper accelerated ageing methods (dry vs. humid heat) and applicability of UV-Vis reflectance spectroscopy for brightness stability studies of kraft pulps were considered. It was shown that UV-Vis reflectance spectroscopy can be used as a very sensitive and simple method to follow the degradation of HexA during thermal ageing treatments of kraft pulps. It was confirmed that the dry heat treatment (105°C, 4h), often used for eucalyptus kraft pulps, does not fully reveal the contribution of HexA to brightness reversion, and may thus lead to erroneous
conclusions regarding the factors affecting brightness stability. According to UV-Vis measurements, dry heat treatment with prolonged reaction time leads to the
degradation of HexA, but the actual color forming reactions of HexA’s degradation products probably do not take place in dry conditions.
conclusions regarding the factors affecting brightness stability. According to UV-Vis measurements, dry heat treatment with prolonged reaction time leads to the
degradation of HexA, but the actual color forming reactions of HexA’s degradation products probably do not take place in dry conditions.
| Original language | English |
|---|---|
| Number of pages | 7 |
| Publication status | Published - 2007 |
| MoE publication type | Not Eligible |
| Event | 3rd International Colloquium on Eucalyptus Pulp - Belo Horizonte, Brazil Duration: 4 Mar 2007 → 7 Jul 2007 Conference number: 3 |
Conference
| Conference | 3rd International Colloquium on Eucalyptus Pulp |
|---|---|
| Country/Territory | Brazil |
| City | Belo Horizonte |
| Period | 4/03/07 → 7/07/07 |