Shear‐precipitated chitosan powders, fibrids, and fibrid papers: Observations on their formation and characterization

Salmon, Sonja; Hudson, Samuel M.

doi:10.1002/polb.1995.090330703

Cited by 16 publications

(8 citation statements)

References 12 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Salmon and Hudson reported chitosan unit cell parameters from published literature and illustrate the differences in these parameters with the treatment and conditioning of the polymer (physical state, annealing, etc) 27. Yui et al 28 and Okuyama et al 24 established the structural and crystalline characteristics of chitosan in anhydrous and hydrated forms, respectively.…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Influence of chitosan characteristics on polymer properties. I: Crystallographic properties

Jaworska

Sakurai

Gaudon

et al. 2003

Polymer International

192

114

View full text Add to dashboard Cite

The properties of chitosan depend on several parameters including its origin (shrimp, squid, fungi etc), characteristics (mol fraction of N-acetylation; molecular weight) and treatments used to condition it (dissolving, precipitation, drying). These parameters can influence the material's sorption properties for metal ions. It has been suggested that the changes in sorption properties are related to the crystallinity of the material. The present work focuses on the study of the crystallographic properties of samples prepared from shrimp, squid and fungi sources, with different characteristics and conditioned by several physical treatments (dissolving, reprecipitation and drying, including oven-drying, freeze-drying), prior to subsequent studies of their sorption properties for platinum (discussed in Part II of this manuscript).

show abstract

Section: Resultsmentioning

confidence: 99%

“…The results of different authors were highly divergent according to the technique they used for conditioning the material: simple deacetylation, re‐precipitation, film‐casting or annealing 18. 23, 27–31…”

Section: Resultsmentioning

confidence: 99%

Influence of chitosan characteristics on polymer properties. I: Crystallographic properties

Jaworska

Sakurai

Gaudon

et al. 2003

Polymer International

192

114

View full text Add to dashboard Cite

show abstract

“…In the traditional wet-spinning method, acetic acid often used as the solution, and the coagulator is a mixture of NaOH and C 2 H 5 OH aqueous solution. 14,29,30 NaOH can neutralize acetic acid interdiffused from the spinning dope solution and C 2 H 5 OH can accelerate interdiffusion between the spinning dope solution and coagulator and improve the form of the chitosan fibers. When [Gly]Cl was used as the solution, a mixture of NaOH and C 2 H 5 OH aqueous solution was also used as the coagulator to prepare chitosan fibers with excellent properties.…”

Section: Composition and Temperature Of Coagulation Bathmentioning

confidence: 99%

Preparation of high strength chitosan fibers by using ionic liquid as spinning solution

Yuan

Liu

et al. 2012

J. Mater. Chem.

View full text Add to dashboard Cite

The morphology and mechanical properties of chitosan fibers obtained by wet-spinning using chitosan-[Gly]Cl (glycine chloride) ionic liquid as spinning dope solution are reported for the first time. The objectives were to understand both how the microstructure of the fibers could be modified and how the mechanical properties were improved by means of using [Gly]Cl ionic liquid as the spinning solution. In the new system, the main component chitosan (the degree of deacetylation was 86%, the molecular weight was about 1.5 Â 10 6 ) was dissolved in an aqueous [Gly]Cl ionic liquid solution; the fibers were then spun using a sodium sulfate (Na 2 SO 4 )/ethanol (C 2 H 5 OH) aqueous solution as the coagulant, and then directly dried under freeze-drying. The fibers spun from the above mentioned system have the chitosan I crystal form, and the breaking tenacity (3.77 cN dtex À1 ) is 4 times more than that (0.86 cN dtex À1 ) from an acetic acid system. The orientation and crystallinity of fibers spun in [Gly]Cl solution was enhanced with an increase of spin stretch ratio, and thereby the mechanical properties of the fibers were improved. Moreover, the fibers had a smooth surface as well as a round and compact structure. More to the point, the used [Gly]Cl could be recovered by simple post processing and the chitosan fibers spun in the recycled [Gly]Cl solution also had a strong breaking tenacity. Therefore, this study verified that [Gly]Cl is a new spinning dope solution for preparing chitosan fibers with strong mechanical properties.

show abstract

“…E-glass in known to have water purification, and papermaking. [1][2][3][4] In partica modulus between 280-320 g/denier, as well as ular, the highly deacetylated product of chitin an extremely smooth surface morphology that known as chitosan has been the focus of much lends itself to a metallic coating such as alumistudy due to its improved solubility and processnum. E-glass fiber used in chaff has an average ability over chitin.…”

Section: Introductionmentioning

confidence: 99%

Improvements in the drying process for wet-spun chitosan fibers

Knaul

Hooper

Chanyi

et al. 1998

J. Appl. Polym. Sci.

View full text Add to dashboard Cite

Chitosan fibers were wet spun from a 6% by weight chitosan in 3% by volume acetic acid solution. The fibers were collected as a 20 filament yarn intended for use as a chaff substrate. The yarn had to be sufficiently dry following spinning to allow for winding and subsequent separation of the filaments. Drying of the yarn was attempted using various techniques including direct and radiant heat, forced air, and chemical drying agents. Product yarns were analyzed for ease of separation of the filaments, as well as comparison of mechanical properties. Individual fibers were evaluated on the basis of moisture content, surface morphology and fiber diameter. Results indicate that the particular drying method or agent used has a considerable impact upon all of the characteristics listed above. A methanol dry bath was found to provide optimum drying of the chitosan yarn, producing filaments with low moisture content that separated easily from one another. Methanol drying yielded chitosan fibers with smaller diameter, superior surface smoothness and superior mechanical properties to fibers dried using forced air, heat, or other tested drying agents such as acetone and isopropanol.

show abstract

Shear‐precipitated chitosan powders, fibrids, and fibrid papers: Observations on their formation and characterization

Cited by 16 publications

References 12 publications

Influence of chitosan characteristics on polymer properties. I: Crystallographic properties

Influence of chitosan characteristics on polymer properties. I: Crystallographic properties

Preparation of high strength chitosan fibers by using ionic liquid as spinning solution

Improvements in the drying process for wet-spun chitosan fibers

Contact Info

Product

Resources

About