The dehydrogenation polymer(DHP) and the DHP-carbohydrate complexes are prepared through the co-polymerization of the unbleached kraft pulp of low kappa number from hardwood and coniferin or coniferin/pectin in the presence of the lignin peroxidase. The 13C-NMR determination shows that the main substructures of the obtained DHP are β-O-4, α-O-4, β-β, β-5 and β-1 structures. Furthermore, it is also found that the DHP is linked with the pectin and the fibers of the kraft pulp by typical LCC linkages, i.e. the benzyl ether bonds, the ester bonds, and a small amount of ketal bonds. As a result, the paper strength is increased significantly after the rebuilding of the CML structure of the fibers. The dry and wet tensile strengths of the paper web are increased by 37.5% and 166.3% after treatment with the coniferin and the pectin. It is demonstrated that the lignin precursor can be co-polymerized with the pectin and the polysaccharides in the pulp fiber efficiently, to obtain the rebuilt CML, which binds the pulp fibers and therefore enhances the paper strength.
WANG Peng
,
LE Xi
,
YE Zhezi
,
WU Chenxi
,
XIE Yimin
. Rebuilding of compound middle lamella of plant fibers and enhancement of paper strength[J]. Science & Technology Review, 2016
, 34(19)
: 71
-75
.
DOI: 10.3981/j.issn.1000-7857.2016.19.011
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