Synthesis and characterization of cellulose acetate naphthoate with good ultraviolet and chemical resistance

Abstract

Commercial cellulose diacetate with a degree of substitution (DS) of 2.45 was partly deacetylated to cellulose acetate (CA) with different DSs by acid-catalyzed hydrolysis and then reacted with 1-naphthoyl chloride (NpCl) to synthesize CA naphthoate (CANp). Fourier transform infrared and 1H-NMR were used to characterize the chemical structure of CANp. The DS of naphthoate moiety (DSCANp) could be varied from 0.18 to 0.98 by adjusting the molar ratio of –OH in CA unit to NpCl, the DS of CA (DSCA), and the reaction time and temperature. When DSCA was 2.01 and the molar ratio was 1:6, the maximum DSCANp of the product was achieved after a reaction at 80°C for 2 h. With the increase of DSCANp, the thermal stability decreased slightly whereas the anti-ultraviolet property was enhanced. Moreover, the obtained films containing CANp exhibited good ultraviolet resistance as well as chemical resistance.

Synthesis of Nanocellulose Derivatives through Esterification with Naphthoic Acid as a Fluorescent Additive

“…The proton signals from approximately 3.00 to 5.60 ppm were assigned to H-1 to H-6 of the anhydrous glucose unit (AGU) in cellulose of cellulose naphthoate . Besides, the signals at 7.5 to 9.0 ppm were attributed to the aromatic rings of naphthalene protons at H-9 to H-15, respectively. , These findings confirm that cellulose and naphthoic acid have indeed been successfully esterified to produce cellulose naphthoates.…”

“…This shift suggests that the peak was situated in a distinct environment, indicating the success of the esterification reaction. The absorption bands at 1593, 1576, and 1510 cm –1 were the characteristic peaks of naphthalene and C–H wagging vibrations of the naphthalene ring at 775 cm –1 …”

“…The absorption bands at 1593, 1576, and 1510 cm −1 were the characteristic peaks of naphthalene and C−H wagging vibrations of the naphthalene ring at 775 cm −1 . 20 To further investigate the assignment of the MCC-Nap and CNF-Nap structures, 1 H NMR spectroscopy analysis was performed and the obtained results are shown in Figure 2. The 1 H NMR spectra were similar for all of the cellulose naphthoates, regardless of the starting cellulosic materials.…”

“…In the 1 H dimension, the test ranges were from 0 to 10 ppm, and 16 scans were used to capture the spectra. The degree of substitution (DS) of the cellulose naphthoate was determined by calculating the ratio of NMR peak integrals using the following equation: DS = false( I NP × 7 false) false( I AGU × 7 false) where I NP and I AGU represent the integration of the peaks corresponding to the naphthoate moiety and cellulose backbone protons, respectively. The “7” indicates the proton numbers of the naphthoate moiety and cellulose, respectively.…”

Preparation, characterization and decomposition test on Tapanuli organoclay reinforced cellulose acetate/cellulose acetate butyrate blend composites

“…Figure 4(a) shows the XRD diffractogram from raw bentonite, bentonite sedimentation, bentonite purification, and Na-bentonite [30], in their study, it was stated that montmorillonite has typical peaks of at 2θ of 5°, 19°and 34°and impurities of quartz at 2θ of 21°and 26°12 Based on the XRD analysis, it can be seen that raw bentonite and bentonite that have any treatment such as sedimentation, purification, and synthesis of Nabentonite still have the same characteristic peak. Organoclay intercalated surfactant HDTMA Br also has been characterized by using XRD [31]. which is related to 19.76 Å, indicating that the surfactant of HDTMABr has been intercalated successfully into bentonite increases the basal spacing of organoclay.…”