Temperature-induced chiral nematic phase changes of suspensions of poly(N,N-dimethylaminoethyl methacrylate)-grafted cellulose nanocrystals

Yi, Jie; Xu, Qunxing; Zhang, Xuefei; Zhang, Ye

doi:10.1007/s10570-009-9350-9

Cited by 117 publications

(102 citation statements)

References 35 publications

(34 reference statements)

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“…The nanometric dimensions of NCC result in a high surface area and hence the powerful interaction of these celluloses with surrounding species, such as water, organic and polymeric compounds, nanoparticles and living cells (Klemm et al 2011). Consequently, NCC is emerging as one of the most promising sustainable building blocks for future advanced materials (Walther et al 2011;Yano et al 2005;Zhang et al 2010;Yi et al 2009). …”

Section: Introductionmentioning

confidence: 99%

Comparing microcrystalline with spherical nanocrystalline cellulose from waste cotton fabrics

et al. 2012

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Microcrystalline cellulose (MCC) and spherical nanocrystalline cellulose (SNCC) were successfully prepared from waste cotton fabrics through acid hydrolysis. The comparative analysis of the morphology and structure between the obtained MCC and SNCC was carried out. The SNCC suspension exhibited higher stability than the MCC suspension. Transmission electron microscopy in combination with atomic force microscopy showed that the cellulose nanospheres with average size of 35 nm were achieved, while the average particle size of MCC was 49 lm. The MCC and SNCC had similar functional groups and crystalline structure as confirmed by Fourier transform infrared spectroscopy and X-ray diffraction analysis, respectively. Viscometric average molecular weight measurement and thermo gravimetric analysis indicated that the degree of polymerization and thermal stability of SNCC was lower than that of MCC. These results should improve understanding of the characteristics of MCC and SNCC derived from waste cotton fabrics and lead to many new applications.

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Section: Introductionmentioning

confidence: 99%

Comparing microcrystalline with spherical nanocrystalline cellulose from waste cotton fabrics

et al. 2012

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“…In the lines of cellulosic liquid crystals, polystyrene (PS)-grafted CNC (~68 wt% PS) [108], poly{6-[4-(4-methoxyphenylazo)phenoxy] hexyl methacrylate} (PMMAZO)-grafted CNC (~75 wt% PMMAZO) [109], poly(N,N-dimethylaminoethyl methacrylate) (PDMAEMA)-grafted CNC (~53 wt% PDMAEMA) [110], etc. were synthesized by surface-initiated ATRP (see Scheme 4d) and examined for their lyotropic and/or thermotropic liquid 274 Y. Nishio et al…”

Section: Cnc Dispersions In Organic Solvents and Surface Graft Modifimentioning

confidence: 99%

Liquid Crystals of Cellulosics: Fascinating Ordered Structures for the Design of Functional Material Systems

Nishio

Sato

Sugimura

2015

Advances in Polymer Science

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This article surveys progress in both fundamental and applied research related to cellulosic liquid crystals, mainly of chiral nematic order. These liquid crystals are divided into two different classes, namely cellulosic macromolecules and cellulose nanocrystals (CNCs), depending on the mesogenic constituent. We start with a review of the fundamental and chiroptical characteristics of molecular liquid crystals of representative cellulose derivatives and then discuss recent efforts on the design and construction of functional material systems (such as stimulisensitive optical media and novel hybrids with minerals). These systems make use of the liquid crystalline molecular assembly of cellulosics. The survey of the other class of cellulosic liquid crystals deals with colloidal suspensions of CNCs obtained by acid hydrolysis of native cellulose fibers. Following the review of fundamental aspects related to the isotropic-anisotropic phase separation behavior of CNC suspensions, attention is directed to current applications of free-standing colored films, polymer composites reinforced with CNCs as mesofiller, and inorganic hybridizations using CNC chiral nematics as template. Some comments and the outlook for future explorations are also offered.

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“…Among the most appealing strategies for "grafting from" are the radical polymerization of poly-e-caprolactone or polylactic acid by ROMP [269][270][271], the polymerization of polystyrene, azo-polymers or polyelectrolytes by ATRP [235][236][237][238][239], the polymerization of poly(methyl methacrylate) or poly(methyl acrylate) by RAFT [243][244][245], and single-electron transfer living radical polymerization (SET-LP) [240,241].…”

Section: Functionalization With Polymersmentioning

confidence: 99%

Organic Modification of Hydroxylated Nanoparticles: Silica, Sepiolite, and Polysaccharides

Tiemblo

García

Hoyos

et al. 2015

Handbook of Nanoparticles

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The incorporation of organic compounds onto the surface of nanoparticles (NPs) differs from the same reactions carried out on macroscopic surfaces in that the former are characterized by surfaces energies much higher than the latter. Consequently, surface stabilization mechanisms of NPs are very active, and among them NP self-aggregation is the first and most important. In NP surface modification, the ability of the experimental conditions to destroy self-aggregation will determine the extent to which the NP surface is modified and so, the modified NP nature. A second consequence of the high-surface free energy is the NP surface avidity to interact chemically or physically with other compounds: NPs readily adsorb water, gases, vapors, or other higher molecular weight substances, and in the particular case of hydroxylated NP, chemical reactivity is both high and rich. This chapter will deal with the surface modification of silica, sepiolite, and polysaccharides. Experimental strategies, resulting organo-NPs, their structure and properties, and frequent uses and applications of them will be reviewed.

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Temperature-induced chiral nematic phase changes of suspensions of poly(N,N-dimethylaminoethyl methacrylate)-grafted cellulose nanocrystals

Cited by 117 publications

References 35 publications

Comparing microcrystalline with spherical nanocrystalline cellulose from waste cotton fabrics

Comparing microcrystalline with spherical nanocrystalline cellulose from waste cotton fabrics

Liquid Crystals of Cellulosics: Fascinating Ordered Structures for the Design of Functional Material Systems

Organic Modification of Hydroxylated Nanoparticles: Silica, Sepiolite, and Polysaccharides

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