Synthesis and characterization of mechanically flexible and tough cellulose nanocrystals–polyacrylamide nanocomposite hydrogels

Yang, Jun; Han, Chunrui; Duan, Jiufang; Ma, Ming‐Guo; Zhang, Xueming; Xu, Feng; Sun, Run‐Cang

doi:10.1007/s10570-012-9841-y

Cited by 131 publications

(75 citation statements)

References 37 publications

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“…Taking both of the effects of elastic modulus and elongation at break into account, the optimal AM ratio in total monomer amount is 50% ( y = 50), and the resulting T15‐AD50 gels exhibited a tensile strength at 367 kPa with a elongation at break and initial modulus at 1,392% and 15.51 kPa, respectively. These values are much higher than those of conventional organic crosslinked hydrogels and comparable to those of nanocomposite hydrogels crosslinked by the clay and other nanoparticles mentioned before .…”

Section: Resultssupporting

confidence: 71%

“…More recently, Yu and coworkers synthesized a kind of tough and highly stretchable nanocomposite hydrogels by in situ free‐radical polymerization of acrylamide in an aqueous suspension of graphene oxide . Yang et al fabricated other series of flexible nanocomposite hydrogels based on cellulose nanocrystals and poly(acrylic acid) with the similar method .…”

Section: Introductionmentioning

confidence: 99%

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High strength nanocomposite hydrogels with outstanding UV‐shielding property

Wang

et al. 2014

Polymer Composites

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A novel series of nanocomposite hydrogels (TAD gels) with high mechanical strength and excellent UVshielding property were prepared by in situ free-radical copolymerization of acrylamide (AM) and N,N-dimethylacrylamide (DMAA) in aqueous solutions of TiO 2 nanoparticles (TiO 2 NPs). It was found that the TiO 2 NPs were uniformly dispersed in the copolymer matrix and acted as inorganic crosslinking agents in TAD gels owing to their hydrogen bonding interactions with polymer chains. The TAD gels exhibited excellent mechanical properties such as large elongations at break, high elastic moduli, and ultimate stresses, all of these properties as well as swelling ratios of TAD gels could be easily controlled by changing the AM ratios and TiO 2 contents in the initial solutions. In addition, the TAD gels with low AM ratios could be prepared into thin films in a customized Teflon model and these films showed high transparency in visible light but could completely block the UV light with wavelength below 366 nm and prevent the methylene blue from degradation under UV irradiation. POLYM. COMPOS., 37:810-817,

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Section: Resultssupporting

confidence: 71%

Section: Introductionmentioning

confidence: 99%

High strength nanocomposite hydrogels with outstanding UV‐shielding property

Wang

et al. 2014

Polymer Composites

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“…For a similar crystalline structure, the elastic modulus of the ENCC crystal domains should be of the same order of magnitude than that of NCCs. In addition, these nanoparticles are produced from renewable resources and are biodegradable, which can promote their use in plastics manufacturing (Fujisawa et al 2013) or biomedical applications as reinforcements (Yang et al 2012;2013b;Zhou et al 2011). However, it is important to understand how these particles behave in common media (for example water) in order to predict their effect when added into more complex formulations (cosmetic, gels, hydrogels, coatings…).…”

Section: Introductionmentioning

confidence: 99%

Intrinsic viscosity of suspensions of electrosterically stabilized nanocrystals of cellulose

et al. 2015

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Electrosterically stabilized nanocrystals of cellulose (ENCCs) have emerged recently as new cellulose nanoparticles among common nanocrystals of cellulose (NCCs) and cellulose nanofibers. ENCC has a special structure being composed of a crystal with protruded amorphous chains at each endcaps bearing carboxyl groups. Here, we studied the intrinsic viscosity of aqueous suspensions of ENCCs as a function of pH and ionic strength. Low pH or high ionic strength reduced the ENCCs to rigid rod-like particles while a polyelectrolyte-like behavior was observed for suspensions of ENCCs around pH 7 and at low ionic strength. The pH had a great effect on charges due to both deprotonation of carboxyl groups and counter-ion effect, while the ionic strength only affected the surface charges of the particles. The zeta potential of ENCC suspensions was measured as a function of pH and ionic strength to establish a link between particle charges and the intrinsic viscosity. Finally, the Fedors model was used to compare our data in the case of rigid rod-like body behavior with literature data on NCC suspensions and the model was shown to be unsuitable.

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“…The hydrophobic surfaces of CNCs were modified using SDBS. For this the pH of the CNC suspension was adjusted to 4 using aqueous H 2 SO 4 and this causes the carboxyl groups on the nanocrystal surface to fully dissociate [10]. Then the CNC suspension was added drop-wise into desired amount of aqueous ammonium salt solution with stirring continued at room temperature overnight.…”

Section: Methodsmentioning

confidence: 99%

Electro-optic Effect in Polydimethylsiloxane-Cellulose Nanocrystal Composite for Reconfigurable Lens

Sadasivuni

Gao

Kafy

et al. 2014

2014 International Symposium on Optomechatronic Technologies

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Electrically tunable adaptive lenses provide several advantages over traditional lens assemblies in terms of compactness, speed and efficiency. Such a lens is a broadband device with its performance independent of light polarization. Here we developed a process for making liquid lens with tunable focal distance on applying electrical input. Materials used to make the lens were polydimethylsiloxane and organomodified cellulose nanocrystal filler. The effect of filler concentration on the optical property and dielectric behavior of composites is analyzed. A novel fabrication process based on individual lens components allows customization of power based lens devices useful for desired applications.

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Synthesis and characterization of mechanically flexible and tough cellulose nanocrystals–polyacrylamide nanocomposite hydrogels

Cited by 131 publications

References 37 publications

High strength nanocomposite hydrogels with outstanding UV‐shielding property

High strength nanocomposite hydrogels with outstanding UV‐shielding property

Intrinsic viscosity of suspensions of electrosterically stabilized nanocrystals of cellulose

Electro-optic Effect in Polydimethylsiloxane-Cellulose Nanocrystal Composite for Reconfigurable Lens

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