Cellulose nanocrystal-poly(oligo(ethylene glycol) methacrylate) brushes with tunable LCSTs

Grishkewich, Nathan; Akhlaghi, Seyedeh Parinaz; Yao, Zhaoling; Berry, Richard M.; Tam, Kam Chiu

doi:10.1016/j.carbpol.2016.02.044

Cited by 67 publications

(48 citation statements)

References 33 publications

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“…Furthermore, the temperature range for the response can be adjusted based on the monomer(s) chosen in the polymerization. For example, the liquid crystal switch could be tailored within 25–90 °C by using this reaction scheme to graft poly(ethylene glycol) methacrylates with varying ethylene glycol side chain lengths . Effects of the grafted polymer molecular weight and concentration of particles on the temperature response of the liquid crystal are likely to be fruitful subjects for future studies.…”

Section: Discussionmentioning

confidence: 99%

“…A widely used approach to impart nanoparticles with temperature‐dependent properties is their surface functionalization with a thermoresponsive polymer . The grafting of several thermoresponsive polymers from CNC surfaces has been previously achieved via controlled radical polymerization routes after reacting surface hydroxyl groups with suitable initiators, which afforded uniformly decorated “brush”‐like modified CNCs . In aqueous suspensions, such “hairy” nanoparticles exhibited thermo‐reversible aggregation and gelation above the lower critical solution temperature (LCST) of the grafted polymer, resulting in a four‐ to sixfold increase of the hydrodynamic diameter and a corresponding increase of the dynamic storage modulus .…”

Section: Introductionmentioning

confidence: 99%

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Thermally Switchable Liquid Crystals Based on Cellulose Nanocrystals with Patchy Polymer Grafts

Risteen

Delepierre

Srinivasarao

et al. 2018

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A thermally "switchable" liquid-crystalline (LC) phase is observed in aqueous suspensions of cellulose nanocrystals (CNCs) featuring patchy grafts of the thermoresponsive polymer poly(N-isopropylacrylamide) (PNIPAM). "Patchy" polymer decoration of the CNCs is achieved by preferential attachment of an atom transfer radical polymerization (ATRP) initiator to the ends of the rods and subsequent surface-initiated ATRP. The patchy PNIPAM-grafted CNCs display a higher colloidal stability above the lower critical solution temperature (LCST) of PNIPAM than CNCs decorated with PNIPAM in a brush-like manner. A 10 wt% suspension of the "patchy" PNIPAM-modified CNCs displays birefringence at room temperature, indicating the presence of an LC phase. When heated above the LCST of PNIPAM, the birefringence disappears, indicating the transition to an isotropic phase. This switching is reversible and appears to be driven by the collapse of the PNIPAM chains above the LCST, causing a reduction of the rods' packing density and an increase in translational and rotational freedom. Suspensions of the "brush" PNIPAM-modified CNCs display a different behavior. Heating above the LCST causes phase separation, likely because the chain collapse renders the particles more hydrophobic. The thermal switching observed for the "patchy" PNIPAM-modified CNCs is unprecedented and possibly useful for sensing and smart packaging applications.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Thermally Switchable Liquid Crystals Based on Cellulose Nanocrystals with Patchy Polymer Grafts

Risteen

Delepierre

Srinivasarao

et al. 2018

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“…Upon increasing the temperature, the extensive hydrogen bonding between the ether groups on POEGMA and hydrogen atoms in water was disrupted, and the polyethylene glycol (PEG) segments on the POEGMA collapsed onto the methacrylate domains resulting in a coil to globule transition. 32,55 Cloud point measurements by UV-vis spectrometry performed to determine the coil to globule transition temperature led to the higher scattering compared to the soluble chains. UV-vis spectrometry results indicated that POEGMA exhibited a single step phase transition with an onset temperature at 50 1C in accordance with reported value 33 (Fig.…”

Section: Resultsmentioning

confidence: 99%

Stimuli-responsive hydrogel consisting of hydrazide-functionalized poly(oligo(ethylene glycol)methacrylate) and dialdehyde cellulose nanocrystals

Nasseri

Tam

2020

Mater. Adv.

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“…CNC has rather interesting optical properties [104] thanks to the liquid crystalline properties creating birefringence [91,105,106]. It has been shown that the perceived colour of the produced films changes depending on the angle of incident.…”

Section: Optical Applicationsmentioning

confidence: 99%

Cellulose Nanocrystals: Production, Functionalization and Advanced Applications

Thompson

Azadmanjiri

Nikzad

et al. 2019

Reviews on Advanced Materials Science

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Cellulose nanocrystals (CNC) are a class of nanoscale biopolymers produced from cellulose sources. CNC materials have gained growing interests which can be attributed to their excellent properties such as excellent biocompatibility, good mechanical properties and high aspect ratio whilst also being an inexpensive material that can be produced from green and renewable sources. Due to the abundant hydroxyl functional groups, the surface of CNC materials are ready to be tuned and functionalized via chemical reactions allowing for many different applications, such as being a reinforcing agent to be incorporated into a hydrophobic polymer matrix. In this review paper,we firstly introduce the general methods for producing CNC from different sources. Different strategies used for surface modification ofCNCare then discussed. Finally, the recent progress on the applications of CNC and CNC composite materials are described in detail.

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Cellulose nanocrystal-poly(oligo(ethylene glycol) methacrylate) brushes with tunable LCSTs

Cited by 67 publications

References 33 publications

Thermally Switchable Liquid Crystals Based on Cellulose Nanocrystals with Patchy Polymer Grafts

Thermally Switchable Liquid Crystals Based on Cellulose Nanocrystals with Patchy Polymer Grafts

Stimuli-responsive hydrogel consisting of hydrazide-functionalized poly(oligo(ethylene glycol)methacrylate) and dialdehyde cellulose nanocrystals

Cellulose Nanocrystals: Production, Functionalization and Advanced Applications

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