Chemical modification of poly(vinyl chloride)
The commercial emulsion PVC of the PCW-E 65N type has been modified in solution with maleic anhydride (MA) or ethylenediamine (EDA). Polymers containing carboxylic (after hydrolysis) or amino groups, respectively, have been obtained. Modification of PVC with BM and EDA results in an increase in water absorption as well as in the sorption and desorption of water vapour. Moreover, PVC modified with BM reveals higher tensile strength and lower elongation at break. Mixing of both modified polymers together is accompanied by an ionic crosslinking. It has been found that swelling of polymer film in butanol (non-solvent) changes the mechanical properties of both modified and non-modified PVC.
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