Warpage-crystallinity relations in rotational molding of polypropylene
| Autor: | P. Doshev, Einar L. Hinrichsen, T. Glomsaker, Espen Ommundsen, Åge Larsen |
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| Rok vydání: | 2009 |
| Předmět: |
Polypropylene
Work (thermodynamics) Materials science Polymers and Plastics Enthalpy of fusion General Chemistry Rotational molding law.invention chemistry.chemical_compound Crystallinity Differential scanning calorimetry chemistry law Scientific method Polymer chemistry Materials Chemistry Crystallization Composite material |
| Zdroj: | Polymer Engineering & Science. 49:523-530 |
| ISSN: | 1548-2634 0032-3888 |
| DOI: | 10.1002/pen.21322 |
| Popis: | The authors present a study of the crystalline properties of selected series of polypropylene (PP) materials in relation to their warpage at conditions relevant for rotational molding. The PP materials have different crystallization temperatures and kinetics. The authors study the crystalline features of the materials using hot-press experiments and differential scanning calorimetry (DSC). In the DSC, the authors do constant cooling rate runs as well as isothermal crystallization and subsequent heating. A multimode crystallization kinetics model was fitted to the DSC cooling runs. Regression analysis was done to relate the results from the crystallization experiments to warpage. The derived empirical model shows that the crystallization temperature, crystallization half-time, and heat of fusion are the most significant parameters influencing warpage. Materials with warpage deviating from the model average are discussed taking aspects of the multimode kinetics into account. The present work could represent a basic platform for understanding and predicting the warpage during rotational molding process. POLYM. ENG. SCI., 2009. © 2009 Society of Plastics Engineers |
| Databáze: | OpenAIRE |
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