scholarly journals Increased thermal stability of nanocellulose composites by functionalization of the sulfate groups on cellulose nanocrystals with azetidinium ions

2017 ◽  
Vol 135 (10) ◽  
pp. 45963 ◽  
Author(s):  
Mikaela Börjesson ◽  
Karin Sahlin ◽  
Diana Bernin ◽  
Gunnar Westman
Keyword(s):  
Thermal Stability ◽  
Cellulose Nanocrystals ◽  
Thermal Stability Of

Mechanical and thermal behavior of cellulose nanocrystals-incorporated Acrodur® sustainable hybrid composites for automotive applications

2020 ◽  
Vol 54 (22) ◽  
pp. 3159-3169 ◽  
Author(s):  
Ezatollah (Nima) Amini ◽  
Mehdi Tajvidi
Keyword(s):  
Thermal Stability ◽  
Impact Strength ◽  
Flexural Strength ◽  
Cellulose Nanocrystals ◽  
Flexural Modulus ◽  
Natural Fibers ◽  
Cellulose Nanocrystal ◽  
Gravimetric Analysis ◽  
Automotive Applications ◽  
Thermal Stability Of

Utilization of cellulose nanocrystals as an additive in the formulation of biocomposites made with Acrodur® resin is presented. Natural fibers/polyethylene terephthalate mats were impregnated with Acrodur® and hot-pressed into the final thickness of 3 mm after drying. Biocomposites with 2 wt.% and 5 wt.% cellulose nanocrystal (dry-basis) were also produced. The produced biocomposite panels were then tested to determine the flexural strength, flexural modulus and Izod impact strength. The results revealed that adding cellulose nanocrystal to the composite formulation increased flexural modulus significantly up to 970 MPa (17.5% increase) at a panel density of 0.5 g/cm3, while it did not significantly affect flexural strength values. A slight reduction was observed in the impact strength of the samples by adding cellulose nanocrystal. The fractured samples of impact test were observed under a scanning electron microscope. It was shown that in all cases, the fracture happened due to the failure of the fibrous system and in particular natural fibers. Thermal stability of the composites was also investigated using thermo-gravimetric analysis. It was found that adding cellulose nanocrystal slightly reduced the thermal stability of the biocomposites. Potential compatibility of cellulose nanocrystal particles with Acrodur® resin is promising and the improvement in flexural modulus can lead to the design of lighter parts for automotive applications such as door panels, headliners, and underbody shields.

Insight into thermal stability of cellulose nanocrystals from new hydrolysis methods with acid blends

Cellulose ◽  
2018 ◽  
Vol 26 (1) ◽  
pp. 507-528 ◽  
Author(s):  
Oriana M. Vanderfleet ◽  
Michael S. Reid ◽  
Julien Bras ◽  
Laurent Heux ◽  
Jazmin Godoy-Vargas ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Cellulose Nanocrystals ◽  
Thermal Stability Of ◽  
Insight Into

Simultaneous improvement of mechanical properties and thermal stability of bacterial polyester by cellulose nanocrystals

2012 ◽  
Vol 89 (3) ◽  
pp. 971-978 ◽  
Author(s):  
Hou-Yong Yu ◽  
Zong-Yi Qin ◽  
Yan-Nan Liu ◽  
Long Chen ◽  
Na Liu ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Thermal Stability ◽  
Cellulose Nanocrystals ◽  
Thermal Stability Of

scholarly journals Surface Modification of Cellulose Nanocrystals with Succinic Anhydride

Polymers ◽  
2019 ◽  
Vol 11 (5) ◽  
pp. 866 ◽  
Author(s):  
Agnieszka Leszczyńska ◽  
Paulina Radzik ◽  
Ewa Szefer ◽  
Matej Mičušík ◽  
Mária Omastová ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Surface Modification ◽  
Thermal Properties ◽  
Reaction Time ◽  
Cellulose Nanocrystals ◽  
Succinic Anhydride ◽  
Molar Ratio ◽  
Hydroxyl Groups ◽  
Degree Of Esterification ◽  
Thermal Stability Of

The surface modification of cellulose nanocrystals (CNC) is a key intermediate step in the development of new functionalities and the tailoring of nanomaterial properties for specific applications. In the area of polymeric nanocomposites, apart from good interfacial adhesion, the high thermal stability of cellulose nanomaterial is vitally required for the stable processing and improvement of material properties. In this respect, the heterogeneous esterification of CNC with succinic anhydride was investigated in this work in order to obtain CNC with optimised surface and thermal properties. The influence of reaction parameters, such as time, temperature, and molar ratio of reagents, on the structure, morphology and thermal properties, were systematically studied over a wide range of values by DLS, FTIR, XPS, WAXD, SEM and TGA methods. It was found that the degree of surface substitution of CNC increased with the molar ratio of succinic anhydride to cellulose hydroxyl groups (SA:OH), as well as the reaction time, whilst the temperature of reaction showed a moderate effect on the degree of esterification in the range of 70–110 °C. The studies on the thermal stability of modified nanoparticles indicated that there is a critical extent of surface esterification below which only a slight decrease of the initial temperature of degradation was observed in pyrolytic and oxidative atmospheres. A significant reduction of CNC thermal stability was observed only for the longest reaction time (240 min) and the highest molar ratio of SA:OH. This illustrates the possibility of manufacturing thermally stable, succinylated, CNC by controlling the reaction conditions and the degree of esterification.

Effects of hydrolysis conditions on the morphology, crystallinity, and thermal stability of cellulose nanocrystals extracted from kenaf bast fibers

Cellulose ◽  
2012 ◽  
Vol 19 (3) ◽  
pp. 855-866 ◽  
Author(s):  
Hanieh Kargarzadeh ◽  
Ishak Ahmad ◽  
Ibrahim Abdullah ◽  
Alain Dufresne ◽  
Siti Yasmine Zainudin ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Cellulose Nanocrystals ◽  
Bast Fibers ◽  
Hydrolysis Conditions ◽  
Kenaf Bast Fibers ◽  
Kenaf Bast ◽  
Thermal Stability Of

scholarly journals Effects of Hybridized Organically Modified Montmorillonite and Cellulose Nanocrystals on Rheological Properties and Thermal Stability of K-Carrageenan Bio-Nanocomposite

Nanomaterials ◽  
2019 ◽  
Vol 9 (11) ◽  
pp. 1547 ◽  
Author(s):  
Siti Zarina Zakuwan ◽  
Ishak Ahmad
Keyword(s):  
Electron Microscopy ◽  
Thermal Stability ◽  
Cellulose Nanocrystals ◽  
Nanocomposite Films ◽  
Morphological Properties ◽  
Modified Montmorillonite ◽  
Organically Modified Montmorillonite ◽  
Organically Modified ◽  
The Matrix ◽  
Thermal Stability Of

Herein, hybrid k-carrageenan bio-nanocomposite films were fabricated by using two types of nanofillers, organically modified montmorillonite (OMMT), and cellulose nanocrystals (CNCs). Hybrid bio-nanocomposite films were made by casting techniques employing 4 wt% of CNCs, OMMT, and hybridized CNCs/OMMT in a 1:1 ratio. The rheological and morphological properties and thermal stability of all composites were investigated using rotational rheometry, thermogravimetry analysis, differential scanning calorimetry, field emission scanning electron microscopy, and transmission electron microscopy (TEM). The results showed that the hybrid CNC/OMMT bio-nanocomposite exhibited significantly improved properties as compared to those for the bio-nanocomposites with single fillers due to the nanosize and homogenous nanofiller dispersion in the matrix. Rheological analysis of the hybrid bio-nanocomposite showed higher dynamic shear storage modulus and complex viscosity values when compared to those for the bio-nanocomposite with individual fillers. The TEM analysis of the hybridized CNC/OMMT bio-nanocomposite revealed that more particles were packed together in the CNC network, which restricted the matrix mobility. The heat resistance and thermal stability bio-nanocomposite k-carrageenan film enhanced rapidly with the addition of hybridized CNCs/OMMT to 275 °C. The hybridized CNCs/OMMT exhibited synergistic effects due to the good affinity through interfacial interactions, resulting in the improvement of the material properties.

Thermal properties enhancement of poly(lactic acid) by corn cob cellulose nanocrystals

2019 ◽  
Vol 10 (4) ◽  
pp. 63-76
Author(s):  
Wei Keat Ng ◽  
Wen Shyang Chow ◽  
Hanafi Ismail
Keyword(s):  
Thermal Stability ◽  
Lactic Acid ◽  
Thermal Properties ◽  
Zeta Potential ◽  
Acid Hydrolysis ◽  
Cellulose Nanocrystals ◽  
Agricultural Waste ◽  
Poly Lactic Acid ◽  
Corn Cob ◽  
Thermal Stability Of

Cellulose nanocrystals were extracted from agricultural waste corn cob using acid hydrolysis followed by freeze drying. Poly(lactic acid)/corn cob cellulose nanocrystals (PLA/CCNC) composites were prepared using solvent casting. The properties of CCNC were characterized using transmission electron microscope (TEM), zeta potential analyzer, and thermogravimetric analyzer (TGA). The effects of CCNC on the thermal properties of PLA were examined using differential scanning calorimetry (DSC) and TGA. From the SEM and TEM results, the irregular shaped and micron-sized corn cob powder was transformed to needle-like shaped nanocellulose (aspect ratio approximately 30.80) after the acid hydrolysis process. TGA results show that the thermal stability of CCNC is higher than that of corn cob powder. The zeta potential of CCNC is −24.6 mV, which indicates there is a repulsion force between the individual CCNC and making them disperse uniformly and stable in aqueous media. DSC and TGA results show that the crystallinity and thermal stability of PLA were increased by the incorporation of CCNC. This demonstrates that the CCNC is a potential bio-nanofiller with good thermal stability and nucleating-ability for PLA.

Thermal stability of cellulose nanocrystals prepared by succinic anhydride assisted hydrolysis

2018 ◽  
Vol 663 ◽  
pp. 145-156 ◽  
Author(s):  
Agnieszka Leszczyńska ◽  
Paulina Radzik ◽  
Katarzyna Haraźna ◽  
Krzysztof Pielichowski
Keyword(s):  
Thermal Stability ◽  
Cellulose Nanocrystals ◽  
Succinic Anhydride ◽  
Thermal Stability Of

scholarly journals The Effect of Chemical and High-Pressure Homogenization Treatment Conditions on the Morphology of Cellulose Nanoparticles

2014 ◽  
Vol 2014 ◽  
pp. 1-11 ◽  
Author(s):  
Suxia Ren ◽  
Xiuxuan Sun ◽  
Tingzhou Lei ◽  
Qinglin Wu
Keyword(s):  
Thermal Stability ◽  
High Pressure ◽  
Acid Hydrolysis ◽  
Cellulose Nanocrystals ◽  
Cellulose Nanofibers ◽  
High Pressure Homogenization ◽  
Homogenization Treatment ◽  
Cellulose Nanoparticles ◽  
Nanofiber Bundles ◽  
Thermal Stability Of

Cellulose nanoparticles were fabricated from microcrystalline cellulose (MCC) through combined acid hydrolysis with sulfuric and hydrochloric acids and high-pressure homogenization. The effect of acid type, acid-to-MCC ratio, reaction time, and numbers of high-pressure homogenization passes on morphology and thermal stability of the nanoparticles was studied. An aggressive acid hydrolysis was shown to lead to rod-like cellulose nanocrystals with diameter about 10 nm and lengths in the range of 50–200 nm. Increased acid-to-MCC ratio and number of homogenization treatments reduced the dimension of the nanocrystals produced. Weak acid hydrolysis treatment led to a network of cellulose nanofiber bundles having diameters in the range of 20–100 nm and lengths of a few thousands of nanometers. The high-pressure homogenization treatment helped separate the nanofiber bundles. The thermal degradation behaviors characterized by thermogravimetric analysis at nitrogen atmosphere indicated that the degradation of cellulose nanocrystals from sulfuric acid hydrolysis started at a lower temperature and had two remarkable pyrolysis processes. The thermal stability of cellulose nanofibers produced from hydrochloric acid hydrolysis improved significantly.

Enhanced thermal stability of biomedical thermoplastic polyurethane with the addition of cellulose nanocrystals

2015 ◽  
Vol 132 (22) ◽  
pp. n/a-n/a ◽  
Author(s):  
Jen-Chieh Liu ◽  
Darren J. Martin ◽  
Robert J. Moon ◽  
Jeffrey P. Youngblood
Keyword(s):  
Thermal Stability ◽  
Cellulose Nanocrystals ◽  
Thermoplastic Polyurethane ◽  
Thermal Stability Of
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