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RETRACTED: Alshabanah et al. Elastic Nanofibrous Membranes for Medical and Personal Protection Applications: Manufacturing, Anti-COVID-19, and Anti-Colistin Resistant Bacteria Evaluation. <i>Polymers</i> 2021, <i>13</i>, 3987.

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Spray Drying Enzyme-Treated Cellulose Nanofibrils.

Sungjun Hwang1,2, Colleen C Walker3, Donna Johnson3

  • 1Advanced Structures and Composites Center, University of Maine, 35 Flagstaff Road, Orono, ME 04469-5793, USA.

Polymers
|October 28, 2023
PubMed
Summary
This summary is machine-generated.

Enzyme treatment reduces energy needed for cellulose nanofibrils (CNFs) production. Enzyme-treated CNFs maintain polypropylene composite strength, offering a sustainable material enhancement.

Keywords:
cellulose nanofibrilsenzyme treatmentpolypropylenespray-drying

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Area of Science:

  • Materials Science
  • Biotechnology
  • Chemical Engineering

Background:

  • Cellulose nanofibrils (CNFs) offer enhanced material properties but require significant energy for processing.
  • Enzymatic pretreatment is a potential method to improve CNF processability and reduce energy consumption.
  • Optimizing CNF production is crucial for their wider application in composite materials.

Purpose of the Study:

  • To evaluate the processability and energy requirements of enzyme-treated CNFs during refining and spray-drying.
  • To investigate the impact of enzyme pretreatment on the morphological and mechanical properties of CNFs and their derived composites.
  • To compare the performance of enzyme-treated CNFs with untreated CNFs in polypropylene (PP) matrix composites.

Main Methods:

  • Production of CNFs from bleached kraft pulp (BKP) using a lab-scale mass colloider with endoglucanase enzyme treatment.
  • Determination of net energy consumption, degree of polymerization (DP), and viscosity during CNF refining.
  • Characterization of enzyme-pretreated spray-dried CNF (SDCNF) powders' morphology.
  • Compounding of enzyme-pretreated SDCNFs into a PP matrix with maleic anhydride grafted polypropylene (MAPP) using a twin-screw extruder.
  • Evaluation of the mechanical properties of the resulting PP-CNF composites.

Main Results:

  • Enzyme treatment significantly reduced the energy consumption required to achieve a target fines level during CNF refining.
  • Enzyme treatment led to a decrease in the degree of polymerization and viscosity of the CNFs.
  • The addition of enzyme-pretreated SDCNFs to a PP matrix maintained the enhanced strength properties of the composites.
  • Morphological properties of enzyme-pretreated SDCNFs were characterized for composite applications.

Conclusions:

  • Enzymatic pretreatment is an effective strategy for improving the energy efficiency of CNF production.
  • Enzyme-treated CNFs can be successfully incorporated into PP composites without compromising mechanical strength.
  • This approach offers a more sustainable and cost-effective route for utilizing CNFs in advanced materials.