Nanocellulose films with combined cellulose nanofibers and nanocrystals: tailored thermal, optical and mechanical properties

Sun, Xiuxuan; Wu, Qinglin; Zhang, Xiuqiang; Ren, Suxia; Lei, Tingzhou; Li, Wencai; Xu, Guangming; Zhang, Quanguo

doi:10.1007/s10570-017-1627-9

Cited by 106 publications

(54 citation statements)

References 44 publications

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“…One of the advantages of CNFs is their extremely low thermal expansion. Sun et al [35] reported that the CTE of the CNF/CNC films from wood pulps was 11.86–17.65 ppm/K. The CTE mismatches and large CTE values among various components may lead to the malfunction of electronic devices and a decrease of the mechanical properties of composites [36].…”

Section: Resultsmentioning

confidence: 99%

A Comparative Study on the Characterization of Nanofibers with Cellulose I, I/II, and II Polymorphs from Wood

Wang

et al. 2019

Polymers

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Polymorphic changes in cellulose nanofibers (CNFs) are closely related to their properties and applications, and it is of interest to investigate how polymorphic changes influence their properties. A comparative study on the properties of CNFs with cellulose I, I/II, and II polymorphs from wood was conducted herein. CNFs were obtained by chemical extraction combined with a simple and efficient mechanical treatment (one pass through a grinder). This process resulted in a relatively high yield of 80–85% after a simple grinding treatment. The polymorphic changes in the CNFs and the chemical composition, morphology, tensile performances, and thermal properties were systematically characterized and compared. The X-ray diffraction and FTIR analyses verified the existence of three types of purified pulps and CNFs with cellulose I, cellulose I/II, and cellulose II polymorphs (CNF-I, CNF-I/II, CNF-II). Morphological observations presented that these three types of CNFs all exhibited high aspect ratios and entangled structures. Tensile testing showed that the CNF films all exhibited high tensile strengths, and the fracture strains of the CNF-I/II (11.8%) and CNF-II (13.0%) films were noticeably increased compared to those of the CNF-I film (6.0%). If CNF-II is used as reinforcing material, its larger fracture strain can improve the mechanical performance of the CNF composites, such as fracture toughness and impact strength. In addition, CNF-I, CNF-I/II, and CNF-II films showed very low thermal expansion in the range 20–150 °C, with the coefficient of thermal expansion values of 9.4, 17.1, and 17.3 ppm/K, respectively. Thermogravimetric analysis (TGA) revealed that the degradation temperature of CNF-I and CNF-II was greater than that of CNF-I/II, which was likely due to increased α-cellulose content. This comparative study of the characterization of CNF-I, CNF-I/II, and CNF-II provides a theoretical basis for the application of CNFs with different polymorphs and could broaden the applications of CNFs.

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Section: Resultsmentioning

confidence: 99%

A Comparative Study on the Characterization of Nanofibers with Cellulose I, I/II, and II Polymorphs from Wood

Wang

et al. 2019

Polymers

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“…CNC from concentrated sulfuric acid hydrolysis (CNC-S58) was also prepared for comparison. Results indicated the yield and zeta potential of CNC-O40S10 were comparable to those of CNC-S58 (Jiang and Hsieh 2013;Sun et al 2017). Besides, oxalic acid hydrolysis produced a large portion (45.6% to 80.8%) of partial carboxyl-functionalized hydrolysis residue (precipitant).…”

Section: Nanocellulose Fractionationmentioning

confidence: 89%

Sustainable high yield production of cellulose nanomaterials for easy-cleaning surfaces of cellulose-based materials

Wang

Sun

Cai

et al. 2019

BioRes

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Cellulose nanomaterials with high yield and desired properties were sustainably produced using a facile recyclable acid treatment (oxalic acid) with mineral acid catalysis at ambient pressure. The resultant nanocellulose was uniform in dimensions (diameter and length distributions) and highly dispersible in the aqueous phase. The nanocellulose with yield up to 33.9%, a zeta potential of -53.9 mV, and 100% volume stability (24 h) was achieved via oxalic acid treatment in conjunction with sulfuric acid addition. The coating of such nanocellulose on paper created a uniform and dense layer on the surface, which lowered Gurley air permeability (i.e., prolonging the time required for air flow from 3.9 to 681.9 s per 100 mL). Moreover, the coated paper showed a complete grease barrier after 48 h and presented easy-cleaning behavior. The approach developed in this work offers an adoptable guidance to design green and sustainable easy-cleaning surfaces. In turn, this approach will provide potential applications of nanocellulose for green based packaging and environmental protection.

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“…Dressing in different forms were studied having as sources wood nanocellulose such as the 3D printing (Rees et al 2015;Xu et al 2018), hydrogels (Liu et al 2016;Basu et al 2018;Fu et al 2018), aerogel (Jack et al 2017), PEG-bionanocomposites (Tehrani et al 2016), electrospuned cellulose acetate/gelatin membranes (Vatankhah et al 2014), films reinforced (Hakkarainen et al 2016;Sun et al 2018) and sponges (Gustaite et al 2015).…”

Section: Introductionmentioning

confidence: 99%

Low cost membrane of wood nanocellulose obtained by mechanical defibrillation for potential applications as wound dressing

et al. 2020

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Large wounds are characterized by clinical and surgical challenges, requiring numerous searches on demand for inexpensive biocompatible materials that produce the best quality of cutaneous healing. Cellulose is a biopolymer of greatest abundance, good biocompatibility and wide application due to its chemical and physical properties. This study was aimed to develop and characterize low cost membranes of wood cellulose nanofibrils for potential

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Nanocellulose films with combined cellulose nanofibers and nanocrystals: tailored thermal, optical and mechanical properties

Cited by 106 publications

References 44 publications

A Comparative Study on the Characterization of Nanofibers with Cellulose I, I/II, and II Polymorphs from Wood

A Comparative Study on the Characterization of Nanofibers with Cellulose I, I/II, and II Polymorphs from Wood

Sustainable high yield production of cellulose nanomaterials for easy-cleaning surfaces of cellulose-based materials

Low cost membrane of wood nanocellulose obtained by mechanical defibrillation for potential applications as wound dressing

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