Deterioration behavior of cellulose acetate films in acidic or basic aqueous solutions

Yamashita, Yoichiro; Endo, Takeshi

doi:10.1002/app.13547

Cited by 42 publications

(20 citation statements)

References 15 publications

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“…Yamashita and Endo investigated the morphological change of CA film in 3.0 N HCl solution by SEM 10. The CA film was eroded extensively and much fine powder formed on its surface after treated by HCl solution.…”

Section: Resultsmentioning

confidence: 99%

Alkaline treatment of diacetate fibers and subsequent cellulase degradation

Tang

Wang

2007

J of Applied Polymer Sci

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The work investigated the degradation behavior of cellulose acetate (CA) fibers in NaOH solutions in heterogeneous conditions and the effect of alkaline treatment on cellulase degradation of CA fibers. Weight analysis and IR spectra showed that the weight loss of CA fibers immersed in NaOH solution chiefly depended on acetylation. Alkaline treatment promoted the degradation of CA fibers in cellulase solution by reason of deacetylation, especially when the degree of substitution (DS) of CA fibers reached 0.8, cellulase degradation increased most markedly. SEM revealed a smooth surface except some thin holes in the CA fibers after immersion in NaOH solution with a lower concentration because of the formation of alkaline cellulose, and only in a higher concentration such as 5.0N, it could be observed that microfibers perpendicular to fiber axis distributed over the surfaces of the fibers. 1 NMR spectra suggested that only in a lower NaOH concentration ( 0.25N), deacetylation reaction was affected by the reactivities of ester groups at position 2, 3, and 6 in anhydroglucose unit, but did not follow the theoretical trend in the three positions. Moreover, the DS for polymer molecules in CA fibers were dispersive after alkaline treatment in heterogeneous condition and the DS of the product increased during sequent cellulase degradation. This was also demonstrated by the result of IR analysis and Xray diffraction.

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Section: Resultsmentioning

confidence: 99%

Alkaline treatment of diacetate fibers and subsequent cellulase degradation

Tang

Wang

2007

J of Applied Polymer Sci

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“…The solid-state spectra ( Figure 12) show clearly the growth of the resonance at 170 ppm associated with the acetyl carbonyl group. The NMR of cellulose acetate has been extensively discussed by Heinze et al [30] and Buchanan et al [34] in which they report high-resolution solution nmr and determine the relative reactivity of the hydroxyl groups in the 2, 3, and 6 positions. The solid-state nmr are less well-resolved but certain features can be identified that are consistent with the gradual substitution of the glucose ring structure.…”

Section: C Nuclear Magnetic Resonancementioning

confidence: 99%

“…Comparison of the spectra for the homogenously substituted commercial cellulose acetate with the fibrous material indicates that the materials are almost indistinguishable by FTIR. The infrared spectra of cellulose and its derivatives have been reported by a number of workers [26][27][28][29][30]. The spectra are complex and infrared dichroism has been used to assess the alignment of molecules within thin films.…”

Section: Fourier Transform Infrared Spectroscopymentioning

confidence: 99%

Plasticization of Fibrous Cellulose Acetate: Part I – Synthesis and Characterization

Pethrick

Wilton

2013

International Journal of Polymeric Materials and Polymeric Biom

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Synthesis and characterization of fibrous cellulose triacetate, CTA, are reported using an acetic acid/anhydride/perchloric acid toluene catalyzed route. The fibrous product exhibits a high degree of nano-crystallinity. An optimum concentration of the reactants for substitution and minimization of fiber degradation was studied. Chain degradation was promoted by the acetylium ion and led to a loss of fibrous structure. Heterogeneity of the material was studied by powder X-ray diffraction, optical microscopy, and solid-state 13 C nuclear magnetic resonance. The structure formed if directly influenced by the original nano structure in the cellulose fiber.

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“…Therefore, the cellulose regeneration from CA membranes by deacetylation becomes an important step in the posttreatment of CA membranes for preparation of cellulosic based carbon membranes [16,17]. Some literatures reported using alkali like NaOH and KOH solution for the deacetylation [13,15,18,19]. Liu and Hsieh reported that reaction time was very important for the deacetylation results [13].…”

Section: Introductionmentioning

confidence: 99%

Optimization of Deacetylation Process for Regenerated Cellulose Hollow Fiber Membranes

2017

International Journal of Polymer Science

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Cellulose acetate (CA) hollow fibers were spun from a CA+ Polyvinylpyrrolidone (PVP)/N-methyl-2-pyrrolidone (NMP)/H 2 O dope solution and regenerated by deacetylation. The complete deacetylation time of 0.5 h was found at a high concentration (0.2 M) NaOH ethanol (96%) solution. The reaction rate of deacetylation with 0.5 M NaOH was faster in a 50% ethanol compared to a 96 vol.% ethanol. The hydrogen bond between CA and tertiary amide group of PVP was confirmed. The deacetylation parameters of NaOH concentration, reaction time, swelling time, and solution were investigated by orthogonal experimental design (OED) method. The degree of cross-linking, the residual acetyl content, and the PVP content in the deacetylated membranes were determined by FTIR analysis. The conjoint analysis in the Statistical Product and Service Solutions (SPSS) software was used to analyze the OED results, and the importance of the deacetylation parameters was sorted as Solution > Swelling time > Reaction time > Concentration. The optimal deacetylation condition of 96 vol.% ethanol solution, swelling time 24 h, the concentration of NaOH (0.075 M), and the reaction time (2 h) were identified. The regenerated cellulose hollow fibers under the optimal deacetylation condition can be further used as precursors for preparation of hollow fiber carbon membranes.

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Deterioration behavior of cellulose acetate films in acidic or basic aqueous solutions

Cited by 42 publications

References 15 publications

Alkaline treatment of diacetate fibers and subsequent cellulase degradation

Alkaline treatment of diacetate fibers and subsequent cellulase degradation

Plasticization of Fibrous Cellulose Acetate: Part I – Synthesis and Characterization

Optimization of Deacetylation Process for Regenerated Cellulose Hollow Fiber Membranes

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