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

e-Polymers ◽  
2017 ◽  
Vol 17 (4) ◽  
pp. 333-340 ◽  
Author(s):  
Jun Song ◽  
Mei Liu ◽  
Zhanping Yang ◽  
Songwei Xu ◽  
Bowen Cheng ◽  
...  
Keyword(s):  
Cellulose Acetate ◽  
Chemical Structure ◽  
Chemical Resistance ◽  
Molar Ratio ◽  
Synthesis And Characterization ◽  
Cellulose Diacetate ◽  
H Nmr ◽  
Ultraviolet Resistance ◽  
Acid Catalyzed

AbstractCommercial 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 and Characterization of PLA-Based Aliphatic-Aromatic Copolyesters: Effect of Diols

2008 ◽  
Vol 55-57 ◽  
pp. 785-788
Author(s):  
M. Namkajorn ◽  
Atitsa Petchsuk ◽  
Mantana Opaprakasit ◽  
Pakorn Opaprakasit
Keyword(s):  
Mechanical Properties ◽  
Molecular Weight ◽  
Lactic Acid ◽  
Chemical Structure ◽  
Molar Ratio ◽  
Synthesis And Characterization ◽  
Polycondensation Reaction ◽  
Dimethyl Terephthalate ◽  
Aromatic Species

PLA-based aliphatic aromatic copolyesters have been synthesized and characterized in order to incorporate the degradability of PLA and good mechanical properties of aromatic species. Synthesis of the copolymers was conducted by polycondensation of lactic acid with dimethyl terephthalate (DMT) and various diols using stannous(II) octoate as a catalyst. Three types of diols with different methylene lengths were employed, i.e., ethylene glycol (EG), propylene glycol (PG) and 1, 4-butanediol (BD). Effects of diols and comonomer molar ratio on the extent of polycondensation reaction and molecular weight of the resulting copolymers were investigated. Diacids and diol ratios of L-lactic acid (LLA), dimethyl terephthalate (DMT) and diol of 1/1/2, 1/2/4 and 2/1/2 were employed. Characterization of chemical structure, molecular weight and thermal and physical properties of the resulting copolymers were conducted by FTIR, NMR, and DSC.

The Template Synthesis and Characterization of New Mono- and Dinuclear Podand Schiff Base Complexesof Scandium Group Elements

1998 ◽  
Vol 63 (3) ◽  
pp. 371-377 ◽  
Author(s):  
Emilia Luks ◽  
Wanda Radecka-Paryzek
Keyword(s):  
Schiff Base ◽  
Template Synthesis ◽  
Molar Ratio ◽  
Synthesis And Characterization ◽  
Mass Spectral Data ◽  
Mass Spectral ◽  
H Nmr ◽  
Elemental Analyses ◽  
Materials Used

The partial Schiff base condensation reactions between 2,6-diacetylpyridine and 1,3-phenylenediamine in the presence of scandium(III), yttrium(III) and lanthanum(III) ions as template agents afford new mono- and dinuclear hexadentate complexes of podate type, depending on the molar ratio of starting materials used in the synthesis. They were characterized by IR, UV-VIS, 1H NMR, and mass spectral data as well as by thermogravimetric and elemental analyses.

Synthesis and Characterization of Quaternary Ammonium Polyether Blocked Polysiloxane

2013 ◽  
Vol 631-632 ◽  
pp. 562-567
Author(s):  
Qiu Feng An ◽  
Bo Xiao ◽  
Xia Meng Xv ◽  
Li Fen Hao
Keyword(s):  
Quaternary Ammonium ◽  
Chemical Structure ◽  
Fiber Surface ◽  
Synthesis And Characterization ◽  
Bending Rigidity ◽  
H Nmr ◽  
Film Forming ◽  
Treated Fiber ◽  
Scanning Electron

In this research, a new quaternary ammonium polyether blocked polysiloxane (QBPEAS) was synthesized by reaction of epoxy polyether terminated polydimethylsiloxane with tetramethylethylenediamine. The chemical structure of QBPEAS was characterized by IR and 1H-NMR. And then the film morphology on fiber substrates was investigated by scanning electron microscope (SEM). The results showed that QBPEAS has a good film-forming ability and can form a macro-smooth Sloane film on the treated fiber surface. In addition, QBPEAS could obviously decrease the bending rigidity and improve the hydrophilicity of the treated fabrics, but has little influence on the fabric whiteness.

Synthesis and characterization of novel chiral derivatizing agents containing β-keto-anthracene adducts (KAAs) by 1H-NMR: aromatic influence and chiral alcohol absolute configuration determination

2019 ◽  
Vol 17 (3) ◽  
pp. 541-554
Author(s):  
Neeranuth Intakaew ◽  
Puracheth Rithchumpon ◽  
Chanatkran Prommin ◽  
Saranphong Yimklan ◽  
Nawee Kungwan ◽  
...  
Keyword(s):  
1H Nmr ◽  
Absolute Configuration ◽  
Synthesis And Characterization ◽  
Chiral Alcohols ◽  
Chiral Alcohol ◽  
Aromatic Rings ◽  
H Nmr ◽  
Chiral Derivatizing Agents

New chiral derivatizing agents and the effect of aromatic rings were investigated for absolute configuration of chiral alcohols via1H-NMR.

scholarly journals Synthesis and characterization of different soybean oil-based polyols with fatty alcohol and aromatic alcohol

e-Polymers ◽  
2021 ◽  
Vol 21 (1) ◽  
pp. 491-499
Author(s):  
Fukai Yang ◽  
Hao Yu ◽  
Yuyuan Deng ◽  
Xinyu Xu
Keyword(s):  
Molecular Weight ◽  
Soybean Oil ◽  
Retention Time ◽  
Ring Opening ◽  
Isoamyl Alcohol ◽  
Synthesis And Characterization ◽  
Intermolecular Force ◽  
H Nmr ◽  
Epoxy Groups

Abstract In this article, five kinds of soybean oil-based polyols (polyol-E, polyol-P, polyol-I, polyol-B, and polyol-M) were prepared by ring-opening the epoxy groups in epoxidized soybean oil (ESO) with ethyl alcohol, 1-pentanol, isoamyl alcohol, p-tert-butylphenol, and 4-methoxyphenol in the presence of tetrafluoroboric acid as the catalyst. The SOPs were characterized by FTIR, 1H NMR, GPC, viscosity, and hydroxyl numbers. Compared with ESO, the retention time of SOPs is shortened, indicating that the molecular weight of SOPs is increased. The structure of different monomers can significantly affect the hydroxyl numbers of SOPs. Due to the large steric hindrance of isoamyl alcohol, p-hydroxyanisole, and p-tert-butylphenol, SOPs prepared by these three monomers often undergo further dehydration to ether reactions, which consumes the hydroxyl of polyols, thus forming dimers and multimers; therefore, the hydroxyl numbers are much lower than polyol-E and polyol-P. The viscosity of polyol-E and polyol-P is much lower than that of polyol-I, polyol-B, and polyol-M. A longer distance between the molecules and the smaller intermolecular force makes the SOPs dehydrate to ether again. This generates dimer or polymers and makes the viscosity of these SOPs larger, and the molecular weight greatly increases.

scholarly journals Synthesis and Characterization of Polyphosphazenes Modified with Hydroxyethyl Methacrylate and Lactic Acid

2013 ◽  
Vol 2013 ◽  
pp. 1-7 ◽  
Author(s):  
Evelyn Carolina Martínez Ceballos ◽  
Ricardo Vera Graziano ◽  
Gonzalo Martínez Barrera ◽  
Oscar Olea Mejía
Keyword(s):  
Lactic Acid ◽  
Ring Opening ◽  
Room Temperature ◽  
Block Structure ◽  
Ring Opening Polymerization ◽  
Synthesis And Characterization ◽  
Poly Lactic Acid ◽  
Hydroxyethyl Methacrylate ◽  
H Nmr

Poly(dichlorophosphazene) was prepared by melt ring-opening polymerization of the hexachlorocyclotriphosphazene. Poly[bis(2-hydroxyethyl-methacrylate)-phosphazene] and poly[(2-hydroxyethyl-methacrylate)-graft-poly(lactic-acid)-phosphazene] were obtained by nucleophilic condensation reactions at different concentrations of the substituents. The properties of the synthesized copolymers were assessed by FTIR,1H-NMR and31P-NMR, thermal analysis (DSC-TGA), and electron microscopy (SEM). The copolymers have a block structure and show twoTg's below room temperature. They are stable up to a temperature of 100°C. The type of the substituents attached to the PZ backbone determines the morphology of the polymers.

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