Cellulose nanocrystal/amino-aldehyde biocomposite films

AbstractCellulose nanocrystals (CNCs) were extracted from natural cellulosic fibres such as bleached cotton and flax with a controlled multi-step sulphuric acid hydrolysis. From the aqueous suspensions of CNCs, the biocomposite films were prepared by casting and evaporation, with an amino-aldehyde (AA) compound in a wide concentration range from 0 to 30%. The AA compound (dimethylol dihydroxy ethylene urea) was considered both as a cross-linker of the CNC and as a matrix polymer for the CNC-reinforced composite system. Two series of films were prepared using different polyols such as sorbitol and glycerol as plasticizers to improve tractability. Heat treatment of the films was performed at elevated temperatures ranging from 140 to 200 °C for 10 min. Results clearly proved that besides temperature, the factors affecting the response of CNC-based nanocomposites to heat treatment were the source of cellulose, the type of plasticizer and the amount of cross-linking agent. Films based on flax–CNC and plasticized with glycerol showed a higher increase in yellowness and a more significant decrease in haze than those derived from cotton–CNC and plasticized with sorbitol, respectively. The cross-linking agent (AA) had a moderating effect on the heat-induced changes of properties. Furthermore, thermal gravimetric analysis (TG) of films revealed that thermal stability of the CNC films improved considerably when AA was added and cross-linking occurred. The increase in Tmax was more significant for the flax–CNC films (from about 230 to 290 °C) than for the cotton–CNC ones (from about 250 to 280 °C).

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Natural cuticle-inspired chitin/silk fibroin/cellulose nanocrystal biocomposite films: fabrication and characterization

Materials Research Express ◽

10.1088/2053-1591/abe974 ◽

2021 ◽

Vol 8 (3) ◽

pp. 036402

Author(s):

Kaimeng Xu ◽

Yulu Zhang ◽

Qian Ye ◽

Jiaxi Wu ◽

Qiushi Li ◽

...

Keyword(s):

Silk Fibroin ◽

Cellulose Nanocrystal ◽

Biocomposite Films ◽

Fabrication And Characterization

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Porous materials from cellulose nanocrystal and mxene surfactants at the oil/water interface

10.1021/scimeetings.0c07366 ◽

2020 ◽

Author(s):

Bingqing qian ◽

Haiqiao Wang ◽

Dong Wang ◽

Hao-Bin Zhang ◽

Jessica Wu ◽

...

Keyword(s):

Porous Materials ◽

Cellulose Nanocrystal ◽

Water Interface ◽

Oil Water

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Optically Ambidextrous Reflection and Luminescence in Self-Organized Left-Handed Chiral Nematic Cellulose Nanocrystal Films

CCS Chemistry ◽

10.31635/ccschem.020.202000248 ◽

2020 ◽

pp. 932-945

Author(s):

Jiawei Tao ◽

Chen Zou ◽

Haijing Jiang ◽

Mei Li ◽

Di Lu ◽

...

Keyword(s):

Cellulose Nanocrystal ◽

Self Organized ◽

Left Handed ◽

Chiral Nematic ◽

Nanocrystal Films

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Effect of Microcrystalline Cellulose from Banana Stem Fiber on Mechanical Properties and Crystallinity of PLA Composite Films

Materials Science Forum ◽

10.4028/www.scientific.net/msf.695.170 ◽

2011 ◽

Vol 695 ◽

pp. 170-173 ◽

Cited By ~ 4

Author(s):

Voravadee Suchaiya ◽

Duangdao Aht-Ong

Keyword(s):

Tensile Strength ◽

Young’S Modulus ◽

Microcrystalline Cellulose ◽

Young's Modulus ◽

Agricultural Waste ◽

Composite Films ◽

Sem Image ◽

Biocomposite Films ◽

Twin Screw ◽

Banana Stem

This work focused on the preparation of the biocomposite films of polylactic acid (PLA) reinforced with microcrystalline cellulose (MCC) prepared from agricultural waste, banana stem fiber, and commercial microcrystalline cellulose, Avicel PH 101. Banana stem microcrystalline cellulose (BS MCC) was prepared by three steps, delignification, bleaching, and acid hydrolysis. PLA and two types of MCC were processed using twin screw extruder and fabricated into film by a compression molding. The mechanical and crystalline behaviors of the biocomopsite films were investigated as a function of type and amount of MCC. The tensile strength and Young’s modulus of PLA composites were increased when concentration of MCC increased. Particularly, banana stem (BS MCC) can enhance tensile strength and Young’s modulus of PLA composites than the commercial MCC (Avicel PH 101) because BS MCC had better dispersion in PLA matrix than Avicel PH 101. This result was confirmed by SEM image of fractured surface of PLA composites. In addition, XRD patterns of BS MCC/PLA composites exhibited higher crystalline peak than that of Avicel PH 101/PLA composites

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