Ordered Phase Formation in Concentrated Hydroxpropylcellulose Solutions

Werbowyj, Rita S.; Gray, Derek G.

doi:10.1021/ma60073a014

Cited by 332 publications

(225 citation statements)

References 3 publications

Supporting

Mentioning

210

Contrasting

Unclassified

Order By: Relevance

“…5,11,12 A so-called cloud point T c , at which the optical turbidity of such a binary mixture rises sharply on heating, is situated around 40 1C with regard to isotropic aqueous HPC solutions, but it is rather lowered at higher HPC concentrations, leading to the mesophase formation. This phase-separation behavior of aqueous HPC solutions would also be affected by addition of imidazolium salts and the changing manner should depend on the ion species and concentration of the used one, as in the case of the previous HPC/water system containing conventional inorganic salts.…”

Section: Lcst-type Phase-separation Behaviormentioning

confidence: 99%

“…[1][2][3][4] Hydroxypropyl cellulose (HPC) is a representative liquid-crystalline cellulose derivative, and it can assume that type of mesomorphic state in a variety of common solvents 1,[5][6][7][8] and even in the melt. 9 Cholesteric mesophases often impart a color because of selective light reflection, when the pitch in the supramolecular helical structure is comparable to wavelengths of visible light.…”

Section: Introductionmentioning

confidence: 99%

“…50-70 wt%. 5,10 Aqueous HPC solutions also show a phase-separation behavior with the lower critical solution temperature (LCST) usually located at o45 1C, 5,11,12 and therefore they become turbid on heating.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Addition effects of imidazolium salts on mesophase structure and optical properties of concentrated hydroxypropyl cellulose aqueous solutions

Chiba

Ito

Nishio

2010

Polym J

View full text Add to dashboard Cite

Addition effects of N-alkyl-substituted methylimidazolium salts ([CnMim][X]) on the mesophase structure and lower critical solution temperature (LCST)-type phase-separation behavior of concentrated hydroxypropyl cellulose (HPC) aqueous solutions were investigated mainly by spectrophotometry. In the cholesteric mesophase formation, at concentrations of more than 50 wt% HPC, helical pitch (P) was confirmed to shift upward according to the chaotropic strength of X -, for example, in a manner satisfying the order of Cl À oBr À oNO 3 À oI À . Organocations generally elevated P relative to the nonionic reference, the effectiveness being pronounced in the order ofWith regard to LCST behavior, imidazolium additives raised the cloud point (T c ) in the isotropic solutions of p40 wt% HPC, whereas the T c value of mesomorphic solutions was prone to be lowered by the addition. Discussion of these observations took into consideration the differences in the N-alkyl structure and amphiphilic nature between cationic imidazolium varieties, as well as the difference in the chaotropic strength between the counter anions. It was also exemplified preliminarily that this kind of salt-containing lyotropic system of HPC exercised an electro-optical function when coupled with an electric circuit.

show abstract

Section: Lcst-type Phase-separation Behaviormentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Addition effects of imidazolium salts on mesophase structure and optical properties of concentrated hydroxypropyl cellulose aqueous solutions

Chiba

Ito

Nishio

2010

Polym J

View full text Add to dashboard Cite

show abstract

“…[13,14] Cholesteric liquid crystals are a promising class of responsive optical materials known for their capability to respond to various external stimuli, such as mechan ical stress, [15,16] electric field, [17,18] temperature, [18] and light. [15,19] Likewise, the reflected color of HPC can be tuned simply by sol vent nature, [14] concentration of the polymer [20] or salt, [21] tem perature, [10,14,21] and by applying shear deformation. [22] In this work, we demonstrate a low cost method for the fabri cation of biocompatible strain responsive photonic sensors based on an aqueous HPC mesophase.…”

mentioning

confidence: 99%

“…[20] Consequentially, the quality of the encapsulation is crucial for the long term performance of the sensor. As such it is important to note that the large area strain sensor reported here retained its tunable color for over half a year after its fab rication.…”

mentioning

confidence: 99%

Biocompatible and Sustainable Optical Strain Sensors for Large‐Area Applications

Kamita

Frka‐Petesic

Allard

et al. 2016

Advanced Optical Materials

112

138

View full text Add to dashboard Cite

By a simple two-step procedure, large photonic strain sensors using a biocompatible cellulose derivative are fabricated. Transient color shifts of the sensors are explained by a theoretical model that consideres the deformation of cholesteric domains, which is in agreement with the experimental results. The extremely simple fabrication method is suitable for both miniaturization and large-sale manufacture, taking advantage of inexpensive and sustainable materials

show abstract

Anisotropic mesogenic liquid crystalline cellulose derivatives as a basis for functional materials

Κryszewski

Wojciechowski

1998

Polym. Adv. Technol.

View full text Add to dashboard Cite

Liquid crystalline cellulose derivatives are promising materials which can be used for the formation of novel functional systems. Microcrystallites were obtained from cellulose fibers which were complexed with Fe(III) according to known methods. Dispersions of these crystallites were mixed with liquid crystalline (hydroxypropyl)cellulose and fixed in an oriented state by photopolymerization of polymerizable lyotropic solvent. The solid anisotropic polymeric networks exhibit high stability of orientation. These systems containing an organized iron complex of liquid crystalline cellulose may have new functional properties expected for dispersed metals or metal oxides in polymeric matrices. © 1998 John Wiley & Sons, Ltd.

show abstract

Ordered Phase Formation in Concentrated Hydroxpropylcellulose Solutions

Cited by 332 publications

References 3 publications

Addition effects of imidazolium salts on mesophase structure and optical properties of concentrated hydroxypropyl cellulose aqueous solutions

Addition effects of imidazolium salts on mesophase structure and optical properties of concentrated hydroxypropyl cellulose aqueous solutions

Biocompatible and Sustainable Optical Strain Sensors for Large‐Area Applications

Anisotropic mesogenic liquid crystalline cellulose derivatives as a basis for functional materials

Contact Info

Product

Resources

About