Some comments on the melting and recrystallization of polyoxymethylene by high-speed and StepScan differential scanning calorimetry

K. Pielichowski; K. Flejtuch

Published : 2022-09-01

Vol. 49 No. 7-8 (2004)

Some comments on the melting and recrystallization of polyoxymethylene by high-speed and StepScan differential scanning calorimetry

K. Pielichowski K. Flejtuch

Abstract

Melting process of polyoxymethylene (POM) was studied by both high-speed differential scanning calorimetry (DSC) and StepScan DSC. It has been observed that for high scan rate (hundreds degrees per minute) side effects as e.g. recrystallization are eliminated. POM macromolecules do not undergo reorganization and a complete melting occurs. The influence of heating rate on the shape of melting peak has been discussed in context of metastability of polymeric crystal structures. Low heating rate facilitates recrystallization, due to molecular nucleation. Molecular nucleation exists when more defected or composed of shorter chains crystallites melt in the vicinity of high-melting polymer crystals, consisting of longer chains. These crystallites undergo nucleation and recrystallization on the existing unmelted crystals. The recrystallization process can be observed by means of modulated temperature differential scanning calorimetry, as it has been shown in this study.

Keywords

high-speed DSC ; StepScan DSC ; polioksymetylen ; topnienie ; rekrystalizacja high-speed DSC ; StepScan DSC ; polyoxymethylene ; melting ; recrystallization

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Pielichowski, K., & Flejtuch, K. (2022). Some comments on the melting and recrystallization of polyoxymethylene by high-speed and StepScan differential scanning calorimetry. Polimery, 49(7-8), 558–560. Retrieved from https://ichp.vot.pl/index.php/p/article/view/1785

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K. Pielichowski kpielich@usk.pk.edu.pl

Affiliation
Cracow University of Technology, Department of Chemistry and Technology of Polymers, ul. Warszawska 24, 31-155 Kraków

K. Flejtuch

Affiliation
Cracow University of Technology, Department of Chemistry and Technology of Polymers, ul. Warszawska 24, 31-155 Kraków