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Relaxation phenomenon and swelling behavior of regenerated cellulose fibers affected by organic solvents. Carbohydr Polym 2021; 259:117656. [PMID: 33673982 DOI: 10.1016/j.carbpol.2021.117656] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2020] [Revised: 01/08/2021] [Accepted: 01/11/2021] [Indexed: 11/20/2022]
Abstract
Regenerated cellulose fibers are extremely sensitive to water. In particular, their mechanical properties are greatly affected by water. Recently, it was clarified that the glass transition temperatures of regenerated cellulose over 500 K can be shifted to room temperature, and small-angle X-ray scattering (SAXS) showed the maxima and shoulders on the equator line in the wet state. In this study, glass transition caused by organic solvents was observed, although the peak heights of tangent δ (tan δ) were low, which suggested the regions affected by organic solvents were small. SAXS showed the maxima and shoulders, suggesting that organic solvents decreased the density of the amorphous region, i.e., widened space between cellulose molecules, creating sufficient space for the micro-Brownian motion of cellulose main chains. However, alkanes with molecular weight larger than n-nonane did not show tan δ peaks, which suggests that the solvent is hard to enter between microfibrils.
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Okugawa A, Sakaino M, Yuguchi Y, Yamane C. Relaxation phenomenon and swelling behavior of regenerated cellulose fibers affected by water. Carbohydr Polym 2019; 231:115663. [PMID: 31888833 DOI: 10.1016/j.carbpol.2019.115663] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2019] [Revised: 11/21/2019] [Accepted: 11/22/2019] [Indexed: 11/20/2022]
Abstract
Regenerated cellulose fibers are extremely sensitive to water; particularly, the mechanical properties are greatly affected by water. We examined the effect of water on regenerated cellulose fibers in respect of the relaxation phenomenon and swelling behavior. The peaks and shoulder of mechanical loss tangent δ were observed at room temperature and water regains of 56-78%. At the same time, the storage modulus markedly decreased around these water regains. Small angle X-ray scattering showed the maxima and shoulders in the wet state, which suggested that water decreased the density of the amorphous region and made space for the movement of polymer segments. It is possible that the glass transition temperatures of 510-550 K shift to room temperature at specific water regains. It is reasonable to suppose that water can penetrate into the amorphous region, loosening the interactions between cellulose molecules and widening the region, and in consequence decreasing the glass transition temperature.
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Affiliation(s)
- Akari Okugawa
- Graduate school of Kobe Women's University, 2-1 Aoyama Higashisuma, Suma-ku, Kobe, Hyogo 654-8585, Japan
| | - Manami Sakaino
- Graduate school of Kobe Women's University, 2-1 Aoyama Higashisuma, Suma-ku, Kobe, Hyogo 654-8585, Japan
| | - Yoshiaki Yuguchi
- Faculty of Engineering, Osaka Electro-Communication University, 18-8 Hatsu-cho, Neyagawa, Osaka 572-8530, Japan
| | - Chihiro Yamane
- Graduate school of Kobe Women's University, 2-1 Aoyama Higashisuma, Suma-ku, Kobe, Hyogo 654-8585, Japan.
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HOSHI T, MAEDA H, MIZOBUCHI K, TETSUKAWA A, SAWAGUCHI T, YANO S. Aerogelation and Mechanical Properties of Bacterial Cellulose/SiO2 Hybrids Prepared by a Sol-Gel Procss. KOBUNSHI RONBUNSHU 2010. [DOI: 10.1295/koron.67.318] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Zhou, Tashiro K, Hongo T, Shirataki H, Yamane C, Ii T. Influence of Water on Structure and Mechanical Properties of Regenerated Cellulose Studied by an Organized Combination of Infrared Spectra, X-ray Diffraction, and Dynamic Viscoelastic Data Measured as Functions of Temperature and Humidity. Macromolecules 2001. [DOI: 10.1021/ma001507x] [Citation(s) in RCA: 61] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Zhou
- Department of Macromolecular Science, Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043, Japan; Fundamental Research Laboratory for Natural and Synthetic Polymers, Asahi Chemical Industry Co. Ltd., Takatsuki, Osaka 569-0096, Japan; and IT Keisoku Seigyo, Co. Ltd., Mishima, Osaka 618-0002, Japan
| | - Kohji Tashiro
- Department of Macromolecular Science, Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043, Japan; Fundamental Research Laboratory for Natural and Synthetic Polymers, Asahi Chemical Industry Co. Ltd., Takatsuki, Osaka 569-0096, Japan; and IT Keisoku Seigyo, Co. Ltd., Mishima, Osaka 618-0002, Japan
| | - Tomoko Hongo
- Department of Macromolecular Science, Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043, Japan; Fundamental Research Laboratory for Natural and Synthetic Polymers, Asahi Chemical Industry Co. Ltd., Takatsuki, Osaka 569-0096, Japan; and IT Keisoku Seigyo, Co. Ltd., Mishima, Osaka 618-0002, Japan
| | - Hironobu Shirataki
- Department of Macromolecular Science, Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043, Japan; Fundamental Research Laboratory for Natural and Synthetic Polymers, Asahi Chemical Industry Co. Ltd., Takatsuki, Osaka 569-0096, Japan; and IT Keisoku Seigyo, Co. Ltd., Mishima, Osaka 618-0002, Japan
| | - Chihiro Yamane
- Department of Macromolecular Science, Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043, Japan; Fundamental Research Laboratory for Natural and Synthetic Polymers, Asahi Chemical Industry Co. Ltd., Takatsuki, Osaka 569-0096, Japan; and IT Keisoku Seigyo, Co. Ltd., Mishima, Osaka 618-0002, Japan
| | - Tadaoki Ii
- Department of Macromolecular Science, Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043, Japan; Fundamental Research Laboratory for Natural and Synthetic Polymers, Asahi Chemical Industry Co. Ltd., Takatsuki, Osaka 569-0096, Japan; and IT Keisoku Seigyo, Co. Ltd., Mishima, Osaka 618-0002, Japan
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Zhou SM, Tashiro K, Ii T. Confirmation of universality of time-humidity superposition principle for various water-absorbable polymers through dynamic viscoelastic measurements under controlled conditions of relative humidity and temperature. ACTA ACUST UNITED AC 2001. [DOI: 10.1002/polb.1135] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Fujioka R, Ishii C, Mori A, Manabe SI, Imada K. Relationship between Mechanical Absorption and Birefringence of Regenerated Cellulose Solid in Solvent. Polym J 1999. [DOI: 10.1295/polymj.31.1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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