Spherical vs rod-like cellulose nanocrystals from enzymolysis: A comparative study as reinforcing agents on polyvinyl alcohol

[Display omitted] •RCNCs and SCNCs were isolated by enzymatic hydrolysis.•Different morphologies of CNCs were used as reinforcing agents with PVA.•The addition of SCNCs improved thermal stability by 60−80 °C.•The addition of RCNCs improved Young's modulus by 120.97 %. In this paper, we have iso...

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Bibliographic Details
Published in:Carbohydrate polymers 2021-03, Vol.256, p.117493-117493, Article 117493
Main Authors: Xu, Jia-Tong, Chen, Xiao-Quan, Shen, Wen-Hao, Li, Zheng
Format: Article
Language:English
Subjects:
Cellulose - chemistry
Cellulose nanocrystallines
Composite films
Crystallization
Elastic Modulus
Enzymatic hydrolysis
Enzymes - chemistry
Hydrolysis
Nanocomposites - chemistry
Nanoparticles - chemistry
Polyvinyl alcohol
Polyvinyl Alcohol - chemistry
Reinforcing effect
Spectroscopy, Fourier Transform Infrared
Stress, Mechanical
Temperature
Tensile Strength
X-Ray Diffraction
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Summary:[Display omitted] •RCNCs and SCNCs were isolated by enzymatic hydrolysis.•Different morphologies of CNCs were used as reinforcing agents with PVA.•The addition of SCNCs improved thermal stability by 60−80 °C.•The addition of RCNCs improved Young's modulus by 120.97 %. In this paper, we have isolated cellulose nanocrystallines (CNCs) with different morphologies by enzymatic hydrolysis, and prepared flexible and transparent nanocomposite films with PVA matrix via solution casting. By means of SEM, UV–vis, XRD, DTG, FT-IR and mechanical methods, the effects of rod-shaped cellulose nanocrystallines (RCNCs) and spherical cellulose nanocrystallines (SCNCs) on PVA nanocomposite films were compared systematically. The results showed CNCs with different morphologies had little effect on the transparency of the composite films, and the crystallinity fluctuated with the change of CNCs additive amount. Compared with the RCNCs, SCNCs had a better improve ability to the thermal stability of the composite films by promoting pyrolysis temperature 60−80 °C. On the contrary, the maximum mechanical properties of the composite films of RCNCs were much higher than those of SCNCs, and the Young's modulus of the PVA/RCNCs composite film were increased by 120.97 % in comparison with the pure PVA.
ISSN:0144-8617
1879-1344
DOI:10.1016/j.carbpol.2020.117493