In situ hybridization of pulp fibres using Mg-Al layered double hydroxides
Tutkimustuotos › › vertaisarvioitu
|Tila||Julkaistu - 2015|
were synthesised in situ from aqueous solution onto chemical pulp ﬁbers of pine (Pinus sylvestris). High super saturated (hss) solution with sodium carbonate produced LDH particles with an average diameter of 100–200 nm. Nano-size (70 nm) LDH particles were found from ﬁbers external surface and, to a lesser degree, from the S2 cell wall after synthesis via low super saturated (lss) route. The synthesis via slow urea hydrolysis (Uhyd) yielded micron and clay sized LDH (2–5 µm) and enabled efﬁcient ﬁber densiﬁcation via mineralization of S2 ﬁber wall layer as indicated by TEM and compliance analysis.
The Uhyd method decreased ﬁber compliance up to 50%. Reduction in the polymerization degree of cellulose was observed with capillary viscometry. Thermogravimetric analysis showed that the hybridization with LDH reduced the exothermic heat, indicating, that this material can be incorporated in ﬂame retardant applications. Fiber charge was assessed by adsorption expermients with methylene blue (MB) and metanil yellow (MY). Synthesis via lss route retained most of the ﬁbres original charge and provided the highest capacity
(10 µmol/g) for anionic MY, indicating cationic character of hybrid ﬁbers. Our results suggested that mineralized ﬁbers can be potentially used in advanced applications such as biocomposites and adsorbent materials