Enthalpy Relaxation during Non-Isothermal Crystallization from the Melt of Polymer: For IPP as Example

Feng Wang

doi:10.4028/www.scientific.net/AMR.415-417.2180

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Enthalpy Relaxation during Non-Isothermal Crystallization from the Melt of Polymer: For IPP as Example
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HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 415-417Enthalpy Relaxation during Non-Isothermal...

Enthalpy Relaxation during Non-Isothermal Crystallization from the Melt of Polymer: For IPP as Example

Abstract:

The enthalpy relaxation rate (r_h) is defined by enthalpy change in unit time to describe non-isothermal crystallization behavior of iPP from its melt. Dates of r_h are transformed from those of heat flow rate which are collected by means of DSC directly. The curve by plotting with r_h to time indicates that the process of non-isothermal crystallization can be separated into two stages by the time point of inflection at r_h curve. The two stages are called stage Ⅰand stage Ⅱ. The curve of r_h is differentiated and the curve of A_h produced. There are two time inflection point in curve of A_h. Combined different trends of r_h and A_h during the whole process, the non-isothermal crystallization are further separated into four sub-stages, which are called stage Ⅰ₁, stage Ⅰ₂, stage Ⅱ₁ and stage Ⅱ₂. The critical values of time and relative crystallization degree which divide the process of non-isothermal crystallization of iPP are present. It provides one new method to uncover the details of non-isothermal crystallization process.