AI Article Synopsis
- The study investigated the effects of different lignin types and contents on the thermoplastic properties of acetylated sawdust (ASD) and cotton-lignin blends (ACLB).
- Despite varied lignin presence, the degree of acetylation wasn't strongly influenced, with ASD showing a minor increase in acetyl groups, unlike ACLB.
- Thermal analysis indicated distinct degradation patterns and thermal behaviors: ASD exhibited consistent properties with one glass transition temperature, while ACLB displayed more complexity with two distinct transition temperatures.
Article Abstract
Sawdust (SD) and cotton-lignin blends (CLB) were acetylated and the effect of lignin type and content on thermoplastic properties of the acetate produced was studied. The lignin in samples did not significantly affect the degree of acetylation. An increase in acetyl groups of 1-3% was observed in acetylated SD (ASD) unlike acetylated CLB (ACLB). Thermogravimetric analysis showed two thermal degradation zones; one at 190-200°C and the other at 330-370°C. The early degradation in ASD corresponds to galactoglucomannans while that in ACLB corresponds to the low-molecular-weight lignin. The second degradation is due to decomposition of cellulose acetate and high-molecular-weight lignin. DSC analysis showed homogeneous behaviour in ASD with only one glass transition temperature (Tg) at 170-180°C, unlike ACLB that showed two Tgs at 170-180°C. Sawdust acetylation, taking advantage of its residual lignin, showed higher reactivity and miscibility as compared to the same material produced by adding previously extracted lignin on cotton.
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| http://dx.doi.org/10.1016/j.ijbiomac.2015.11.022 | DOI Listing |
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