Crystallization and Mechanical Properties of Polypropylene under Processing-Relevant Cooling Conditions with respect to Isothermal Holding Time
For semicrystalline thermoplastics, aside from pressure and shear, the temperature-time behavior while cooling the melt significantly affects the geometry and degree of ordered structures (e.g., spherulite size, degree of crystallization, and crystal modification) and, as a consequence, the resultin...
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| Format: | Article |
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Wiley
2016-01-01
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| Series: | International Journal of Polymer Science |
| Online Access: | http://dx.doi.org/10.1155/2016/5450708 |
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| author | Christopher Fischer Dietmar Drummer |
| author_facet | Christopher Fischer Dietmar Drummer |
| author_sort | Christopher Fischer |
| collection | DOAJ |
| description | For semicrystalline thermoplastics, aside from pressure and shear, the temperature-time behavior while cooling the melt significantly affects the geometry and degree of ordered structures (e.g., spherulite size, degree of crystallization, and crystal modification) and, as a consequence, the resulting global component properties. Previous research has shown that a higher isothermal holding temperature (e.g., mold temperature and chill-roll temperature) leads to the formation of more distinct ordered structures and, therefore, can lead to greater stiffness and strength. Nevertheless, isothermal holding time during manufacturing is typically not taken into account. In this paper, fast scanning calorimetry (FSC) measurements were taken using polypropylene to analyze the crystallization during idealized temperature-time profiles based on the dynamic temperature process and to investigate the crystallization behavior at different temperatures and isothermal holding times analytically. Furthermore, iPP foils were extruded and tested mechanically to investigate the knowledge gained experimentally. Analytical and mechanical results show that foils produced at the same isothermal holding temperature can obtain significantly different ordered structures and mechanical properties depending primarily on the isothermal holding time. |
| format | Article |
| id | doaj-art-362ea80ac64346c38d90872f65b4d6c7 |
| institution | Kabale University |
| issn | 1687-9422 1687-9430 |
| language | English |
| publishDate | 2016-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | International Journal of Polymer Science |
| spelling | doaj-art-362ea80ac64346c38d90872f65b4d6c72025-02-03T01:33:06ZengWileyInternational Journal of Polymer Science1687-94221687-94302016-01-01201610.1155/2016/54507085450708Crystallization and Mechanical Properties of Polypropylene under Processing-Relevant Cooling Conditions with respect to Isothermal Holding TimeChristopher Fischer0Dietmar Drummer1Institute of Polymer Technology, Friedrich-Alexander University of Erlangen-Nürnberg, 91058 Erlangen, GermanyInstitute of Polymer Technology, Friedrich-Alexander University of Erlangen-Nürnberg, 91058 Erlangen, GermanyFor semicrystalline thermoplastics, aside from pressure and shear, the temperature-time behavior while cooling the melt significantly affects the geometry and degree of ordered structures (e.g., spherulite size, degree of crystallization, and crystal modification) and, as a consequence, the resulting global component properties. Previous research has shown that a higher isothermal holding temperature (e.g., mold temperature and chill-roll temperature) leads to the formation of more distinct ordered structures and, therefore, can lead to greater stiffness and strength. Nevertheless, isothermal holding time during manufacturing is typically not taken into account. In this paper, fast scanning calorimetry (FSC) measurements were taken using polypropylene to analyze the crystallization during idealized temperature-time profiles based on the dynamic temperature process and to investigate the crystallization behavior at different temperatures and isothermal holding times analytically. Furthermore, iPP foils were extruded and tested mechanically to investigate the knowledge gained experimentally. Analytical and mechanical results show that foils produced at the same isothermal holding temperature can obtain significantly different ordered structures and mechanical properties depending primarily on the isothermal holding time.http://dx.doi.org/10.1155/2016/5450708 |
| spellingShingle | Christopher Fischer Dietmar Drummer Crystallization and Mechanical Properties of Polypropylene under Processing-Relevant Cooling Conditions with respect to Isothermal Holding Time International Journal of Polymer Science |
| title | Crystallization and Mechanical Properties of Polypropylene under Processing-Relevant Cooling Conditions with respect to Isothermal Holding Time |
| title_full | Crystallization and Mechanical Properties of Polypropylene under Processing-Relevant Cooling Conditions with respect to Isothermal Holding Time |
| title_fullStr | Crystallization and Mechanical Properties of Polypropylene under Processing-Relevant Cooling Conditions with respect to Isothermal Holding Time |
| title_full_unstemmed | Crystallization and Mechanical Properties of Polypropylene under Processing-Relevant Cooling Conditions with respect to Isothermal Holding Time |
| title_short | Crystallization and Mechanical Properties of Polypropylene under Processing-Relevant Cooling Conditions with respect to Isothermal Holding Time |
| title_sort | crystallization and mechanical properties of polypropylene under processing relevant cooling conditions with respect to isothermal holding time |
| url | http://dx.doi.org/10.1155/2016/5450708 |
| work_keys_str_mv | AT christopherfischer crystallizationandmechanicalpropertiesofpolypropyleneunderprocessingrelevantcoolingconditionswithrespecttoisothermalholdingtime AT dietmardrummer crystallizationandmechanicalpropertiesofpolypropyleneunderprocessingrelevantcoolingconditionswithrespecttoisothermalholdingtime |