Non-isothermal crystallization kinetics and its effect on the mechanical properties of homopolymer isotactic polypropylene

The non-isothermal crystallization of the isotactic Polypropylene (iPP) was studied using differential scanning calorimetry and polarizing optical microscopy. Jeziorny’s model and Ozawa’s theoretical approaches were applied to study the non-isothermal kinetics of the iPP. Jeziorny’s approach proved...

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Bibliographic Details
Published inJournal of polymer research Vol. 29; no. 1
Main Authors Nouira, S., Hassine, T., Fitoussi, J., Shirinbayan, M., Gamaoun, F., Tcharkhtchi, A.
Format Journal Article
LanguageEnglish
Published Dordrecht Springer Netherlands 2022
Springer
Springer Nature B.V
Springer Verlag
Subjects
Activation energy
Calorimetry
Characterization and Evaluation of Materials
Chemistry
Chemistry and Materials Science
Crystal structure
Crystallinity
Crystallization
Elastic limit
Engineering Sciences
Industrial Chemistry/Chemical Engineering
Isotacticity
Kinetics
Materials
Mechanical properties
Microstructure
Optical microscopy
Original Paper
Polymer Sciences
Polypropylene
Spherulites
Tensile tests
Polypropylene
Mechanical characteristics
Crystallization
mechanical characteristics
crystallization
polypropylene
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Summary:The non-isothermal crystallization of the isotactic Polypropylene (iPP) was studied using differential scanning calorimetry and polarizing optical microscopy. Jeziorny’s model and Ozawa’s theoretical approaches were applied to study the non-isothermal kinetics of the iPP. Jeziorny’s approach proved to be the most relevant model to the present material. Simultaneously, the activation energy was calculated with Kissinger’s method and Vyazovkin’s iso-conversional approach. Indeed, the latter provides an activation energy varying between 100 and 176 kJ/mol. Furthermore, the WAXD scans indicated the presence of a single crystalline form in the used material. To study the effect of the microstructure on the mechanical properties of the iPP, multiscale tensile tests were carried out for different film microstructures. At macroscopic scale, the increase in the diameter of spherulites, inevitably accompanied by a rise in the crystallinity rate, induces the growth of rigidity, brittleness, and elastic limit. Moreover, the results of the in-situ micro-tensile tests present the evolution of spherulites during loading.
ISSN:1022-9760
1572-8935
DOI:10.1007/s10965-021-02869-4