Cellulose

French, Alfred D.; Pérez, Serge; Bulone, Vincent; Rosenau, Thomas; Gray, Derek G.

doi:10.1002/0471440264.pst042.pub2

Cited by 21 publications

(17 citation statements)

References 350 publications

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“…Finally, cellulose type IV is obtained by chemical modification with glycerol of cellulose type III I and type III II , producing respectively, cellulose type IV I and cellulose type IV II. (French & Santiago, 2013;French, Perez, Bulone, Rosenau, & Gray, 2018;Lavoine et al, 2012)…”

Section: Discussion Of Resultsmentioning

confidence: 99%

Recent studies on modified cellulose/nanocellulose epoxy composites: A systematic review

Neves

Ornaghi

Zattera

et al. 2021

Carbohydrate Polymers

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Cellulose and its derivatives are widely explored for films and thickening of pharmaceutical solutions, in paints, as reinforcement in composites, among others. This versatility is due to advantages such as renewability, low cost, and environmental friendliness. When used in polymer composites, due to the hydrophilic character of the cellulose, surface chemical modification is highly recommended to improve its compatibility with the polymeric matrix. Hence, this paper presents a systematic review of chemically modified cellulose/epoxy resin composites focusing on the last five years. The investigation followed the PRISMA protocol that delivers a meticulous summary of all available primary research in response to a research question. After including/excluding steps, thirty-six studies were included in the review. The results were presented focusing on thermal, mechanical and dynamic-mechanical properties of the composites. In brief, this methodology helped identifying the main gaps in knowledge in that field.

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Section: Discussion Of Resultsmentioning

confidence: 99%

Recent studies on modified cellulose/nanocellulose epoxy composites: A systematic review

Neves

Ornaghi

Zattera

et al. 2021

Carbohydrate Polymers

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“…Extensive hydrogen bonding is evident between multiple OH groups present in cellulose/chitin macromolecular backbone, and between polypeptides rich in the alanine (Ala) amino acid of silk proteins. (b) Chitin molecular model is reprinted with permission from ref ( 149 ). Copyright 2012 John Wiley and Sons.…”

Section: Supramolecular Chemistry Of Renewable Biopolymersmentioning

confidence: 99%

Deconstruction and Reassembly of Renewable Polymers and Biocolloids into Next Generation Structured Materials

et al. 2021

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This review considers the most recent developments in supramolecular and supraparticle structures obtained from natural, renewable biopolymers as well as their disassembly and reassembly into engineered materials. We introduce the main interactions that control bottom-up synthesis and top-down design at different length scales, highlighting the promise of natural biopolymers and associated building blocks. The latter have become main actors in the recent surge of the scientific and patent literature related to the subject. Such developments make prominent use of multicomponent and hierarchical polymeric assemblies and structures that contain polysaccharides (cellulose, chitin, and others), polyphenols (lignins, tannins), and proteins (soy, whey, silk, and other proteins). We offer a comprehensive discussion about the interactions that exist in their native architectures (including multicomponent and composite forms), the chemical modification of polysaccharides and their deconstruction into high axial aspect nanofibers and nanorods. We reflect on the availability and suitability of the latter types of building blocks to enable superstructures and colloidal associations. As far as processing, we describe the most relevant transitions, from the solution to the gel state and the routes that can be used to arrive to consolidated materials with prescribed properties. We highlight the implementation of supramolecular and superstructures in different technological fields that exploit the synergies exhibited by renewable polymers and biocolloids integrated in structured materials.

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“…The cellulose fiber is used herein as representative example for this class of hierarchically structured, nanoporous biopolymers. Cellulose 23 , from the molecular viewpoint, has the rather simple chemical structure of β-O-1,4-linked glucopyranose repeating units that give strictly regular and rigid nanofibers, i.e. elementary fibrils, as its smallest subunit (Figure 1).…”

Section: Introductionmentioning

confidence: 99%

Enhanced Reactivity in Surface-Confined Water of Hierarchically Structured Polymers

Beaumont

Jusner²,

Gierlinger³

et al. 2020

Preprint

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The remarkable efficiency of biological chemical reactions is the result of evolution and many of these reactions are promoted by confined water. This has inspired significant research endeavors exploiting the potential of this special water in chemistry. However, these systems are so far limited to complex artificial solids or biphasic systems and small molecules as reactants. Here, we show that the intrinsically present surface-confined water in hierarchically structured biopolymers can be used as nanomedium to promote chemical reactions. We found in the example of cellulose fibers that confined water was actively involved in the reaction mechanism and facilitated the surface acetylation of the fiber, increasing reaction kinetics, efficiency and regioselectivity. Our findings can be regarded as proof-of-principle that the hydration layer in nanoporous polymers can be exploited as medium to promote chemical reactions at their surface. This concept can likely be extended to other polymers and various reaction systems. <br>

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Cellulose

Cited by 21 publications

References 350 publications

Recent studies on modified cellulose/nanocellulose epoxy composites: A systematic review

Recent studies on modified cellulose/nanocellulose epoxy composites: A systematic review

Deconstruction and Reassembly of Renewable Polymers and Biocolloids into Next Generation Structured Materials

Enhanced Reactivity in Surface-Confined Water of Hierarchically Structured Polymers

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