Abstract
The paper deals with the study of plasticizers using different thermal methods. The literature data on the melting points of plasticizers proved uncertain; we intended to gather the data by other methods, differential scanning calorimetry (DSC), dynamic mechanical analysis (DMA) and thermally stimulated discharge (TSD). Results of ten plasticizers are demonstrated. During this work, we found that most of plasticizers have no well-defined melting point, and the solidification of plasticizer is similar to the glass transition of polymers. Only the di-n-butyl-phthalate showed regular crystallization. Thermally stimulated discharge current (TSD) method revealed that these compounds have several transitions –dispersion ranges assigned to different molecular motions.
Highlights
Melting point is an important property of a pure compound
The components might influence each other’s mobility. These processes can be investigated in mechanical field: thermo-mechanical analysis (TMA), dynamic mechanical analysis (DMA), thermally stimulated creep (TSC); in
The low temperature peaks appear melting but these have been evaluated as glass transitions
Summary
Melting point is an important property of a pure compound. This value is usually imparted in technical data sheets of plasticizers but without describing the method used. The components might influence each other’s mobility These processes can be investigated in mechanical field: thermo-mechanical analysis (TMA), dynamic mechanical analysis (DMA), thermally stimulated creep (TSC); in. We found that the published melting points are unreliable cannot be used for predicting properties of plasticized polymer. For DMA tests, 70 gm−2 cellulose-based standard filter paper of 0.13 mm thickness was used as scaffold. The specimens were paper filter strips soaked with the plasticizer to be tested. Borosilicate glass filter disks of 7 mm diameter were soaked with the plasticizer and put into the standard cell.
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