Producing Cellulose Microfibrils at a High Solid Content with and without Mechanical or Enzymatic Pretreatment.

Autor:	Zhang X; Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources, Jiangsu Provincial Key Lab of Pulp and Paper Science and Technology, Nanjing Forestry University, Nanjing 210037, China.; USDA Forest Products Laboratory, Madison, Wisconsin 53726, United States., Yelle DJ; USDA Forest Products Laboratory, Madison, Wisconsin 53726, United States., Kitin P; USDA Forest Products Laboratory, Madison, Wisconsin 53726, United States., Tong G; Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources, Jiangsu Provincial Key Lab of Pulp and Paper Science and Technology, Nanjing Forestry University, Nanjing 210037, China., Zhu JY; USDA Forest Products Laboratory, Madison, Wisconsin 53726, United States.
Jazyk:	angličtina
Zdroj:	Biomacromolecules [Biomacromolecules] 2024 Apr 08; Vol. 25 (4), pp. 2509-2519. Date of Electronic Publication: 2024 Mar 21.
DOI:	10.1021/acs.biomac.3c01457
Abstrakt:	This study conducted a detailed evaluation of the feasibility of producing cellulose microfibrils (CMF) from a kraft-bleached hardwood pulp at high solid contents with and without pretreatments. CMFs produced by planetary ball milling at solid contents 17 and 28% were compared with those from 1 to 5% under the same milling conditions. Fiber pretreatments using a commercial endoglucanase and mechanical refining using a laboratory PFI mill were also applied before ball milling at a solid content of 28%. Two mechanisms of fiber fibrillation were identified from the results obtained: (i) ball and fiber/fibril interactions─the primary mechanism and (ii) interfiber/fibril frictional and tensional interactions─the secondary mechanism. The secondary mechanism plays an important role only in early-stage fibrillation and became less important as fibrillation proceeded in the later stage toward nanofibrillation. Improving fiber dispersion at lower solid content facilitated fibrillation. Endoglucanase pretreatment substantially shortened fibers to result in a "pulverized-like" CMF with short fibrils at an extended milling time. Mechanical refining of fibers facilitated fibrillation to result in CMFs with a morphology similar to that from runs without any fiber pretreatment but for a much shorter milling time. Both CMF water retention value (WRV) measurements and CMF suspension sedimentation experiments showed results consistent with imaging observations. The insights gained through this study provide relevant information with commercial significance regarding CMF production at high solids, which is not currently available in the literature.
Databáze:	MEDLINE
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