Chemical modification of PVC by different nucleophiles in solvent/non-solvent system at high temperature View Full Text


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Article Info

DATE

2018-11

AUTHORS

V. Najafi, E. Ahmadi, F. Ziaee

ABSTRACT

Chemical modification of polyvinyl chloride by nucleophiles is a versatile method for preparation of new functional polymers. Modification of PVC was carried out using different nucleophiles (Nu) in ethylene glycol (EG)/N,N-dimethylformamide (DMF) (1:1 by volume) solution. OH−, N3−, and SCN− were examined as nucleophiles in this study. The FTIR spectrum confirmed substitution of Cl by nucleophiles and also the elimination of HCl in the modification reaction of PVC. The glass transition temperatures (Tgs) of modified-PVC samples were in the order N3− > SCN− > OH− and were equal to 87.6, 86.8 and 78.15 °C, respectively. The T5% (the temperature at which weight loss is 5%) of PVC was 266 °C, while after 1 h modification by OH− it reduced to 197 °C. After alkaline modification, the scanning electron microscopy (SEM) images not only showed an increase in surface roughness and porosity, but also revealed a relatively large drop in average particle size from 160 to 80 µm. Molecular weight and molecular weight distribution were determined by gel permeation chromatography (GPC). The GPC results showed that the number average molecular weight (Mn) and weight average molecular weight (Mw) were decreased from 79,950 and 176,360 g mol−1 in crude PVC to 45,370 and 99,930 g mol−1, respectively, after 1 h modification by OH−. Alkaline treatment also decreased the mechanical strength of PVC. More... »

PAGES

841-850

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http://scigraph.springernature.com/pub.10.1007/s13726-018-0658-x

DOI

http://dx.doi.org/10.1007/s13726-018-0658-x

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