Influence of types and amounts of plasticizers on the tensile properties of polymer PVC sensitive films
The effects of the dosage of four plasticizers,namely dioctyl phthalate(DOP),dibutyl phthalate(DBP),o-nitrophenyl octyl ether(o-NPOE),and dioctyl sebacate(DOS),on the tensile properties of polymer PVC sensitive films in ion-selective electrodes were investigated.The results showed that:① With the increase in plasticizer content,the tensile strength of the sensitive film decreased,and the decrease was first large and then small.When the mass ratio of plasticizer to PVC was 1.0:1,the ten-sile strength of the DOP/PVC sensitive film was the highest,and the tensile strengths of the DOS/PVC and o-NPOE/PVC sensitive films were close,smaller than that of the DOP/PVC sensitive film.The ten-sile strength of the sensitive film prepared by the plasticizer DBP which had a short alkyl chain was the lowest.When the mass ratio of plasticizer to PVC was 3.0∶1,the tensile strengths of the four sensitive films was relatively close.② With the increase in plasticizer content,the elongation at break of the sensi-tive film increases.When the mass ratio of plasticizer to PVC was 1.0:1,the elongation at break of DBP/PVC sensitive film was the highest,followed by that of DOS/PVC sensitive film,the elongation at break of DOP/PVC sensitive film was smaller than that of the first two,and that of o-NPOE/PVC sensi-tive film was the smallest.When the mass ratio of plasticizers to PVC was 3.0:1,the order of elongation at break of the four plasticizer sensitive films was DBP/PVC ≈ DOS/PVC＞DOP/PVC＞o-NPOE/PVC.③ The plasticizer o-NPOE had relatively good compatibility with PVC.The results of this study provide data support for the later study of electrode performance.
plasticizerpolymer sensitive filmpolyvinyl chloridetensile strengthelongation at break
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