Acryloyl-modified cellulose nanocrystals: effects of substitution on crystallinity and copolymerization with acrylic monomers

Dogan-Guner, Ezgi M.; Schueneman, Gregory T.; Shofner, Meisha L.; Meredith, J. Carson

doi:10.1007/s10570-021-04219-5

Cited by 7 publications

(3 citation statements)

References 40 publications

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“…Also, it is possible that the poor crystallization outcomes can be attributed to the samples’ preparation by solvent casting [ 46 ] without thermal annealing at elevated temperatures. However, a mixed amorphous crystalline phase could be assumed in the case of the CA-MA100 sample, for which the shoulder at about 23.2° can be ascribed to the formation of newly ordered structures associated with a crystallization pattern triggered by methacrylic sequences ( Figure 4 ) [ 21 , 35 , 45 ].…”

Section: Resultsmentioning

confidence: 99%

“…However, CA functionalization is still required to expand the range of currently available cellulose chemicals and identify appropriate uses [ 14 , 15 , 16 , 17 ]. One common alternative for functionalizing CA and polysaccharides, in general, is to employ molecules of low molecular weight from the (meth)acrylate derivative family that includes photopolymerizable fragments [ 18 , 19 , 20 , 21 ], taking into account that the recently generated products take part in photopolymerization processes and are susceptible to light irradiation. Using photochemical techniques rather than physical or chemical ones has a number of benefits, such as greater control over the entire process due to the ability to turn on and off the irradiation source and the ability to keep solvents out of the reactions [ 22 , 23 , 24 ].…”

Section: Introductionmentioning

confidence: 99%

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Photopolymerization Pattern of New Methacrylate Cellulose Acetate Derivatives

Trifan,

Chibac-Scutaru,

Melinte

et al. 2024

Polymers

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Polymeric photocrosslinked networks, of particular interest in the design of materials with targeted characteristics, can be easily prepared by grafting light-sensitive moieties, such as methacrylates, on polymeric chains and, after photochemical reactions, provide materials with multiple applications via photopolymerization. In this work, photopolymerizable urethane–methacrylate sequences were attached to free hydroxyl units of cellulose acetate chains in various proportions (functionalization degree from 5 to 100%) to study the properties of the resulting macromolecules and the influence of the cellulosic material structure on the double bond conversion degree. Additionally, to manipulate the properties of the photocured systems, the methacrylate-functionalized cellulose acetate derivatives were mixed with low molecular weight dimethacrylate derivatives (containing castor oil and polypropylene glycol flexible chains), and the influence of UV-curable composition on the photopolymerization parameters being studied. The achieved data reveal that the addition of dimethacrylate comonomers augmented the polymerization rates and conversion degrees, leading to polymer networks with various microstructures.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Photopolymerization Pattern of New Methacrylate Cellulose Acetate Derivatives

Trifan,

Chibac-Scutaru,

Melinte

et al. 2024

Polymers

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“…CNC, in particular, is an ideal candidate for polymer-based composites benefiting from its birefringence, remarkable mechanical properties, and thermal stability. [20] The rich hydroxyl groups on CNC surfaces cause poor compatibility with hydrophobic polymers, thus surface modification [21][22][23] is required. Nevertheless, fillers promote mechanical properties while restricting the motility of molecular chains and reducing the reprocessability of elastomers.…”

Section: Introductionmentioning

confidence: 99%

Environmentally Friendly High‐Performance Polydimethylsiloxane Composites Reinforced with Renewable Cellulose Nanocrystals Based on Dynamic Silyl Ether Linkages

Cao,

Chen,

et al. 2024

Macro Chemistry & Physics

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Environmentally friendly high‐performance composites made from either reprocessable polymer matrix or renewable fillers have become increasingly significant in order to reach a sustainable future. Herein, polydimethylsiloxane/modified cellulose nanocrystals (PDMS/mCNC) composites showing outstanding mechanical and reprocessable properties via silyl ether linkages were prepared. With only 1 wt% mCNC, the PDMS/mCNC composite exhibits the tensile strength of 2.96 MPa, which is twice that of the pure PDMS elastomer, while the toughness can achieve 7.32 MJ/m3. Remarkably, the reprocessing efficiency can be as high as 100% even for triple reprocessing process. Additionally, the favorable effect of mCNC on constructing hybrid filler network within vitrimers was explored for the first time. Selection of boron nitride nanosheet (BNNS) as the functional filler, 40 wt% BNNS was uniformly dispersed by only a small amount of mCNC and a homogeneous thermally conductive network was built, with the thermal conductivity of the PDMS/mCNC@BNNS composite increasing remarkably to 2.901 W m−1 K−1. In a word, this work paves the way to develop sustainable, mechanically strong and reprocessable composites with mCNC as a renewable bio‐filler.This article is protected by copyright. All rights reserved

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