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Industrial lignin has a lower compatibility and processability than other polymers during the preparation of composites. To valorize the industrial lignin from spent liquor of alkaline pulping mills, polycaprolactone was grafted onto alkaline lignin to improve its compatibility and processability in this investigation. The lignin-g-polycaprolactone copolymer was prepared by the ring-opening polymerization of the ε-caprolactone monomer under anhydrous conditions and was catalyzed by n-butyl titanate. The techniques of FTIR, P NMR and H NMR were employed to investigate the reaction mechanisms, including the reaction preference of hydroxyl groups and the average length of the PCL arms. Eventually, the composites of lignin-g-PCL and PCL were prepared by melt blending, and the results demonstrated that the compatibility and processability of lignin was significantly improved by the grafting modification, and that the fracture surface of composite, as well as the mechanical properties, was strongly affected by the average length of the PCL arms grafted on lignin. The best mechanical performance of the composite with tensile strength and bending strength of 1.22 ± 0.05 MPa and 2.23 ± 0.10 MPa, respectively, was achieved by the lignin-g-PCL sample with averaged PCL arm length about 19. This study paves the way for a wider utilization of lignin in composites and biomaterials.
This article was published in the following journal.
Name: International journal of biological macromolecules
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The most abundant natural aromatic organic polymer found in all vascular plants. Lignin together with cellulose and hemicellulose are the major cell wall components of the fibers of all wood and grass species. Lignin is composed of coniferyl, p-coumaryl, and sinapyl alcohols in varying ratios in different plant species. (From Merck Index, 11th ed)
A copper-containing oxidoreductase enzyme that catalyzes the oxidation of 4-benzenediol to 4-benzosemiquinone. It also has activity towards a variety of O-quinols and P-quinols. It primarily found in FUNGI and is involved in LIGNIN degradation, pigment biosynthesis and detoxification of lignin-derived products.
A ceramidase subtype that is active at alkaline pH. It is found at high levels within the SMALL INTESTINE.
A genus of coccoid, extremely halophilic HALOBACTERIACEAE which grows in alkaline conditions. They are nonmotile and strictly aerobic and are found in soda lakes, alkaline salterns, and soda soils.
An enzyme that catalyzes the hydrolysis of nitrophenyl phosphates to nitrophenols. At acid pH it is probably ACID PHOSPHATASE (EC 22.214.171.124); at alkaline pH it is probably ALKALINE PHOSPHATASE (EC 126.96.36.199). EC 188.8.131.52.
Osteoporosis is a disease in which the bones become extremely porous, are subject to fracture, and heal slowly, occurring especially in women following menopause and often leading to curvature of the spine from vertebral collapse. Follow and track&n...