Page 170 - CW E-Magazine (12-12-2023)

Special Report

Controlled allocation of aro- Tertiary amines from the The above newly made products were
matic/aliphatic substituents to reductive catalytic fraction applied to disperse CPP in acrylic resin
polysaccharides and lignin (L) (RCF) Lignin (L) mono- and as a water-based paint. (ACS Sustainable
in sugarcane bagasse (SCB) dimers: Catalytic N-functionalised Chem. Eng., 2023; DOI: 10.1021/acssus-
via successive homogeneous antioxidants from wood chemeng.2CO4657).
transesterification using ionic Extraction and clarification
liquid (IL) D. Ruijten et al have used supported of orange wax obtained from
Cu-catalyst for monomeric methoxyphe-
S. Suzuki et al have demonstrated a nolics, such as guaiacol and syringols, waste of the citrus industry
facile but highly controllable conversion which exhibit reduced catalytic activity G. deSouza Ferreira et al have referred to
of SCB into a valuable thermoplastic relative to phenolic and non-phenolic the generation of waste in the processing
by utilising the excellent solubility and model compounds. Cu supported on of oranges, which is underutilised or
unique organocatalytic abilities of an IL, SiO performs well compared to earlier discarded. These authors have worked
2
Cu-ZnO . The stable L-derived tertiary on the orange wax, which is obtained by
2
amines displayed excellent antioxi- hydrodistillation and solvent extraction
dant activity. (ACS Sustainable Chem. followed by the clarification of the wax
Eng., 2023; DOI: 10.1021/acssusche- via oxidative treatment with hydrogen
meng.3C07343). peroxide. The wax so obtained has
properties comparable to that of bees
Lignin (L) and L derivatives as wax. (Eur. J. Lipid Sci. Technol., 2023;
dispersants for Cu phthalocya- DOI: 10.1002/ejit.202200141).
nine pigment (CPP) nanopar-
ticles Toward bio-sourced elastomer
1-ethyl-3-methylimidazolium acetate. from β-Farnesene (F) and sty-
An one-pot chemical modification J. Yang et al have worked on the rene
is reported by adjusting ratios of the water-borne applications of CPP. L’s
starting materials. Thus, the controlled hyper-branched polymer structure makes P. Sahu et al have come out with a new
introduction of the acyl groups into SCB it potentially useful and L was function- strategy of using F, which is obtained
achieved a homogeneous polymer phase. alised with carboxylic acid (-COOH) and by fermentation. The title elastomers
The hot-pressed film had enhanced amine (-NH ) to enhance the interaction were made by copolymerisation of F and
2
mechanical properties, like tensile strength, styrene under a high-temperature persulfate
ductility, etc. (ACS Omega, 2023; DOI: emulsion process for applications in
10.1021/acsomega.3C00369). tires. The molecular weight of 108,500
g/mole and 162,100 g/mole for 30 and
A facile strategy to fabricate 50 wt % styrene content are reported.
a lignin (L)-based thermo- The copolymer exhibited complete 1,4-
set alternative to formal cis and trans-microstructure formation.
dehyde-based wood adhesives with aqueous solutions. The above pro- These elastomers had improved thermal
stability. Vulcanisation properties are
ducts were compared with the commer- good and good wet skid resistance is
X. Shi et al have combined alkali L cially available alkali L, dealkali L, and
and poly(propylene glycol)bis(2-amino- lignosulphonate, and found to be superior. reported. (Ind. Eng. Chem. Res., 2023;
propylether) and mixed it with wood DOI: 10.1021/acs.iecr.2C04562).
flour and a commercially available
crosslinker (polyetherimide), which is
then followed by direct hot-pressing into
particle boards. The internal bonding
strength was superior compared to the
formaldehyde-based product and was
1.42-MPa. (Green Chem., 2023; DOI:
10.1039/D3GC00763D).

170 Chemical Weekly December 12, 2023
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