Dual-functionalized cellulose nanofibrils prepared through TEMPO-mediated oxidation and surface-initiated ATRP

Huang, Chih‐Feng; Chen, Jem-Kun; Tsai, Tzung-Yung; Hsieh, Ya-An; Lin, Kun‐Yi Andrew

doi:10.1016/j.polymer.2015.02.056

Cited by 71 publications

(52 citation statements)

References 62 publications

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“…Perhaps the most common surface modifications intend to overcome the hydrophilic nature of CNMs in order to disperse them in hydrophobic polymer matrices. A wide variety of modifications have been reported, e.g., silanization, 233 transesterification, 234 vinyl esterification, 235 carbodiimide, 236 ATRP, 237 grafting from ring opening polymerization (ROP), 238 and many others, as summarized in recent reviews . 12,13,239 There is an old saying that it takes 10 min to make a polymer (or graft to one), but 10 months to characterize it.…”

Section: Section 6 Surface Modification Characterization Of Cnmsmentioning

confidence: 99%

Current characterization methods for cellulose nanomaterials

et al. 2018

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A new family of materials comprised of cellulose, cellulose nanomaterials (CNMs), having properties and functionalities distinct from molecular cellulose and wood pulp, is being developed for applications that were once thought impossible for cellulosic materials. Commercialization, paralleled by research in this field, is fueled by the unique combination of characteristics, such as high on-axis stiffness, sustainability, scalability, and mechanical reinforcement of a wide variety of materials, leading to their utility across a broad spectrum of high-performance material applications. However, with this exponential growth in interest/activity, the development of measurement protocols necessary for consistent, reliable and accurate materials characterization has been outpaced. These protocols, developed in the broader research community, are critical for the advancement in understanding, process optimization, and utilization of CNMs in materials development. This review establishes detailed best practices, methods and techniques for characterizing CNM particle morphology, surface chemistry, surface charge, purity, crystallinity, rheological properties, mechanical properties, and toxicity for two distinct forms of CNMs: cellulose nanocrystals and cellulose nanofibrils.

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Section: Section 6 Surface Modification Characterization Of Cnmsmentioning

confidence: 99%

Current characterization methods for cellulose nanomaterials

et al. 2018

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“…CNFs were prepared as previously described 25 . The CNF dispersion was obtained by mixing wood pulp, 2,2,6,6tetramethylpiperidine-1-oxyl (TEMPO), sodium bromide (NaBr), and sodium hydroxide (NaOH) in deionized water.…”

Section: Preparation Of Cnfsmentioning

confidence: 99%

“…The CNFs were prepared by TEMPO-oxidation of cellulose and had an oxidation (substitution) ratio of approximately 30% 25 . The average diameter of the dispersed CNFs was approximately 3 nm, and the length was in the range of 10-20 μm (Fig.…”

Section: Self-healing and Injectable Properties Of Cs-cnf Hydrogelsmentioning

confidence: 99%

“…Natural fibrils of cellulose have a diameter of 2-20 nm and a crystallinity of 65-95%, depending on their origins 21,22 . Cellulose nanofibers (CNFs) can be obtained from wood using 2,2,6,6-tetramethylpiperidinyl-1-oxyl (TEMPO)-mediated oxidation, also named TEMPO-oxidized CNFs (TOCNs) [23][24][25] . Through the process of partial carboxylation of the hydroxyl group, CNFs are extracted from native cellulose and uniformly dispersed in water.…”

Section: Introductionmentioning

confidence: 99%

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Novel chitosan–cellulose nanofiber self-healing hydrogels to correlate self-healing properties of hydrogels with neural regeneration effects

et al. 2019

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Biodegradable self-healing hydrogels are attractive materials for tissue repair; however, the impact of the self-healing abilities of hydrogels on tissue repair is not clear. In this study, we prepared novel chitosan-cellulose nanofiber (CS-CNF) composite self-healing hydrogels with the same modulus (approximately 2 kPa) but tunable self-healing properties. By adding a low amount of CNFs (0.06-0.15 wt%) in the pristine chitosan (CS) self-healing hydrogel, the reversible dynamic Schiff bonding, strain sensitivity, and self-healing of the hydrogel are obviously affected. Neural stem cells embedded in the CS-CNF hydrogel with better self-healing properties reveal significantly enhanced oxygen metabolism as well as neural differentiation. The differentiation of neural stem cells is highly correlated with their metabolic change in the self-healing hydrogel. Moreover, the neural regeneration effect of the optimized CS-CNF hydrogel with 0.09 wt% CNFs and the best self-healing properties show a 50% improvement over the pristine CS hydrogel in the zebrafish brain injury model. A mechanism is proposed to interpret the tunable self-healing properties of CS-CNF hydrogels with stiffness maintained in a similar range. The new self-healing hydrogels help to clarify the role of self-healing in the biological performance of hydrogels as well as provide design rationale for hydrogels with better injectability and tissue regeneration potential.

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“…The synthesis of peptide-or protein-containing hybrid materials and their applications is the subject of the papers by Di Lena [64] and Konkolewicz [65]. Cellulose-derived conjugates are described by Oh [66] and Huang [67], and hybrids containing another material isolated from plants, lignin, are the subject of Washburn's work [68]. In addition to control over functionality, CRP techniques allow for unprecedented ability to prepare macromolecules with complex architectures.…”

Section: Contents Lists Available At Sciencedirectmentioning

confidence: 99%

Introduction to the special issue of Polymer on “Macromolecular Engineering” dedicated to Professor Krzysztof Matyjaszewski on the occasion of his 65th birthday

Tsarevsky

2015

Polymer

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Dual-functionalized cellulose nanofibrils prepared through TEMPO-mediated oxidation and surface-initiated ATRP

Cited by 71 publications

References 62 publications

Current characterization methods for cellulose nanomaterials

Current characterization methods for cellulose nanomaterials

Novel chitosan–cellulose nanofiber self-healing hydrogels to correlate self-healing properties of hydrogels with neural regeneration effects

Introduction to the special issue of Polymer on “Macromolecular Engineering” dedicated to Professor Krzysztof Matyjaszewski on the occasion of his 65th birthday

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