Controlling the Size and Film Strength of Individualized Cellulose Nanofibrils Prepared by Combined Enzymatic Pretreatment and High Pressure Microfluidization
| Autor: | Jianzhong Sun, Songqiang Xie, Fuxiang Chang, Qianqian Zhu, Wei Wei, Qianqian Wang |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2016 |
| Předmět: |
Environmental Engineering
Softwood Materials science lcsh:Biotechnology Modulus Bioengineering Young's modulus 02 engineering and technology Enzymatic treatment 01 natural sciences chemistry.chemical_compound symbols.namesake lcsh:TP248.13-248.65 Ultimate tensile strength Cellulose Composite material Microfluidization Waste Management and Disposal chemistry.chemical_classification Grinding 010405 organic chemistry Mechanical fibrillation Polymer 021001 nanoscience & nanotechnology 0104 chemical sciences chemistry Kraft process symbols Cellulose nanofibrils 0210 nano-technology Kraft paper Mechanical strength |
| Zdroj: | BioResources, Vol 11, Iss 1, Pp 2536-2547 (2016) ResearcherID |
| ISSN: | 1930-2126 |
| Popis: | The production of functionalized polymers from biomass is of great interest. Cellulose nanofibrils (CNFs) isolated from lignocellulose have great potential in novel functional materials. In the present study, mild enzymatic treatment followed by high pressure microfluidization of a bleached softwood kraft pulp led to the release of individualized CNFs. Disk milling and high pressure microfluidization resulted in entangled networks of CNFs. CNFs from mild enzyme pretreatments were 8 to 12 nm in diameter and 200 to 400 nm in length, while CNFs from pure mechanical pretreatment were an entangled network of nanofibrils with a diameter of 10 to 20 nm. Films prepared from the resulting CNFs were flexible and semitransparent, and they exhibited high specific tensile stress and modulus. The specific tensile stress and modulus were increased by 3- to 5-fold and 5- to 11-fold, respectively. The specific tensile modulus of the CNFs films from mild enzyme treatments followed by microfluidization was approximately 15 to 16 MN·m/kg, while that of CNFs from pure mechanical fibrillation with or without microfluidization was 10 MN·m/kg and 14 MN·m/kg, respectively. The specific tensile strength of the CNFs films from mild enzyme treatment was slightly lower (72 to 98 kN·m/kg) than that of the CNFs films from pure mechanical fibrillation. |
| Databáze: | OpenAIRE |
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