Investigation on the effect of the acid number of the plasticizer on some PVC properties

Authors

  • T. S. Gancheva,

    1. Scientific Research Laboratory on Plastics Properties and Applications, Higher Institute on Mechanical and Electrical Engineering “Lenin”, Sofia 1156, Bulgaria
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  • P. D. Dinev,

    1. Scientific Research Laboratory on Plastics Properties and Applications, Higher Institute on Mechanical and Electrical Engineering “Lenin”, Sofia 1156, Bulgaria
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  • K. G. Bukovska

    1. Scientific Research Laboratory on Plastics Properties and Applications, Higher Institute on Mechanical and Electrical Engineering “Lenin”, Sofia 1156, Bulgaria
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  • Corrected proofs received March 8, 1983

Abstract

The effect of polyester plasticizer of differing acid number on the properties of PVC compositions, to be used for electric insulation purposes, is investigated. It is established that the acid number affects both the temperature dependence of the specific bulk resistance in vitreous and highly elastic state and the process of formation of a polymer matrix with minimum ion diffusion factor. The assumption is made that the effects observed are due both to the different stability of plasticizers of differing acid number towards destruction at thermal processing and to the difference in density of the polymer matrix depending on the acid number of the plasticizer. It is considered that polyester plasticizer (PEP) is a cheap and efficient plasticizer, which, irrespective of the nontraditional high acid number, could successfully be used for PVC plastication.

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