n-DIOCTADECYL FUMARATE–VINYL ACETATE COPOLYMER: SYNTHESIS, CHARACTERIZATION AND APPLICATION AS FLOW IMPROVER FOR OILS

The article presents naked-eye methods for fast, sensitive, and selective detection of isopentylamine and cadaverine vapours based on 4-N,N-dioctylamino-4′-dicyanovinylazobenzene (CR-528) and 4-N,N-dioctylamino-2′-nitro-4′-dicyanovinylazobenzene (CR-555) dyes immobilized in ethylene-vinyl acetate copolymer (EVA). The reaction of CR-528/EVA and CR-555/EVA indicator layers with isopentylamine vapours caused a vivid colour change from pink/purple to yellow/orange-yellow. Additionally, CR-555/EVA showed colour changes upon exposure to cadaverine. The colour changes were analysed by ultraviolet–visible (UV/VIS) molecular absorption spectroscopy for amine quantification, and the method was partially validated for the detection limit, sensitivity, and linear concentration range. The lowest detection limits were reached with CR-555/EVA indicator layers (0.41 ppm for isopentylamine and 1.80 ppm for cadaverine). The indicator layers based on EVA and dicyanovinyl azobenzene dyes complement the existing library of colorimetric probes for the detection of biogenic amines and show great potential for food quality control.

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Gel permeation chromatography in the study of the molecular weight distribution vinyl chloride–vinyl acetate copolymer. III. Influence of the incompatibility of polymers and some problems of interpretation of experimental data

Journal of Applied Polymer Science ◽

10.1002/app.1979.070230621 ◽

1979 ◽

Vol 23 (6) ◽

pp. 1811-1817 ◽

Cited By ~ 6

Author(s):

J. Janča ◽

S. Pokorný ◽

M. Kolínský

Keyword(s):

Experimental Data ◽

Molecular Weight ◽

Vinyl Acetate ◽

Vinyl Chloride ◽

Molecular Weight Distribution ◽

Weight Distribution ◽

Gel Permeation Chromatography ◽

Gel Permeation ◽

Acetate Copolymer

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Preparation of n-Alkylacrylate and Vinyl Acetate Copolymer and Its Influence on Low-Temperature Fluidity of Diesel Fuel

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.236-238.708 ◽

2011 ◽

Vol 236-238 ◽

pp. 708-714 ◽

Cited By ~ 1

Author(s):

Hong An ◽

Shu Gang Gao ◽

Shuang Li ◽

Yan Xin Xie

Keyword(s):

Molecular Weight ◽

Low Temperature ◽

Vinyl Acetate ◽

Diesel Fuel ◽

Mass Fraction ◽

Raw Materials ◽

Cold Filter Plugging Point ◽

Point Depressant ◽

Petrochemical Company ◽

Acetate Copolymer

The n-tetradecylacrylate-vinyl acetate copolymer (PPV) was prepared from n-tetradecylacrylate and vinyl acetate. The PPV was employed as pour point depressant to improve the low-temperature fluidity of the -20# diesel from Daqing Petrochemical Company. The result indicated that the solidification (SP) and the cold filter plugging point (CFPP) were affected largely by PPV. And when mass fraction of PPV -14(copolymerization conditions: 80 °C,w（benzoyl peroxide）1％（total weight of raw materials）, n（vinyl acetate）∶n（n- tetradecanolacrylate） = 4∶1 ) in diesel fuel was 0.1%wt, the SP reduced by 15.0 °C, the CFPP reduced by 6.0 °C simultaneously; We analysise the different molecular weight of PPV-14, and discover that the molecular weight of PPV-14 is ralated to the the low-temperature fluidity of the -20# diesel from Daqing Petrochemical Company. When mass fraction of PPV -14(molecular weight is 15000, distribution coefficient is 3.11) in diesel fuel was 0.1% wt, the SP reduced by 18.0 °C, the CFPP reduced by 7.0 °C, simultaneously.

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