The Synthesis Of Polyester Plasticizer And Its Application In PVC

In this dissertation, the project focused on the process of synthesizing the linearstraight-chain polyester plasticizers using the 1, 2– propanediol and adipic acid, withthe dibutyltin oxide as the catalyst. The influences of the reaction temperature, thereaction time and the feed ratio of the reactants on the extent of reaction andmolecular weight of the product were studied. The branched polyester plasticizerswere synthesized by adding some trimethylolpropane into the reactants. The polyesterplasticizers which have different average molecular weights and different branchingdegrees were synthesized by controlling the reaction conditions and the dosage of thereactants. The synthesized polyester plasticizers and the DOP were used as theplasticizer of PVC. The influences of the polyester plasticizers to the properties ofPVC products, including the extraction property and the migration property of theplasticizer, as well as the mechanical property, the dynamic mechanical property andthe thermal stability properties were investigated in detail. Finally, the mechanicalproperties of the plasticized PVC with different average degrees of polymerizationwere studied. Moreover, the applicability of the synthesized polyester plasticizer wasstudied.The results showed that, the reaction temperature, the reaction time, the catalystand the feeding ratio of the raw materials have great influences on the molecularweight of the polyesters. Compared to the plasticizers which have smaller molecularweights, the synthesized polyester plasticizers have better extraction-enduringproperties, migration-enduring properties, mechanical properties and thermalstabilities when they were used as plasticizers of PVC.