Non-Isothermal Crystallisation Kinetics of Polypropylene at High Cooling Rates and Comparison to the Continuous Two-Domain pvT Model
The modelling of the correlation between pressure, specific volume and temperature (pvT) of polymers is highly important for applications in the polymer processing of semi-crystalline thermoplastics, especially in injection moulding. In injection moulding, the polymer experiences a wide range of coo...
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| Format: | Article |
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MDPI AG
2020-07-01
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| Series: | Polymers |
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| Online Access: | https://www.mdpi.com/2073-4360/12/7/1515 |
| _version_ | 1797563009770455040 |
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| author | Jonathan Alms Christian Hopmann Jian Wang Tobias Hohlweck |
| author_facet | Jonathan Alms Christian Hopmann Jian Wang Tobias Hohlweck |
| author_sort | Jonathan Alms |
| collection | DOAJ |
| description | The modelling of the correlation between pressure, specific volume and temperature (pvT) of polymers is highly important for applications in the polymer processing of semi-crystalline thermoplastics, especially in injection moulding. In injection moulding, the polymer experiences a wide range of cooling rates, for example, 60 °C/min near the centre of the part and up to 3000 °C/min near the mould walls. The cooling rate has a high influence on the pvT behaviour, as was shown in the continuous two-domain pvT model (CTD). This work examined the Hoffman–Lauritzen nucleation and growth theory used in the modified Hammami model for extremely high cooling rates (up to 300,000 °C/min) by means of Flash differential scanning calorimeter (DSC) measurements. The results were compared to those of the empirical continuous two-domain pvT model. It is shown that the Hammami model is not suitable to predict the crystallisation kinetics of polypropylene at cooling rates above 600 °C/min, but that the continuous two-domain pvT model is well able to predict crystallisation temperatures at high cooling rates. |
| first_indexed | 2024-03-10T18:36:29Z |
| format | Article |
| id | doaj.art-535a7ee9d52b4d38a12f0e6d5cc368d2 |
| institution | Directory Open Access Journal |
| issn | 2073-4360 |
| language | English |
| last_indexed | 2024-03-10T18:36:29Z |
| publishDate | 2020-07-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Polymers |
| spelling | doaj.art-535a7ee9d52b4d38a12f0e6d5cc368d22023-11-20T06:09:45ZengMDPI AGPolymers2073-43602020-07-01127151510.3390/polym12071515Non-Isothermal Crystallisation Kinetics of Polypropylene at High Cooling Rates and Comparison to the Continuous Two-Domain pvT ModelJonathan Alms0Christian Hopmann1Jian Wang2Tobias Hohlweck3Institute for Plastics Processing (IKV), RWTH Aachen University, Aachen 52074, GermanyInstitute for Plastics Processing (IKV), RWTH Aachen University, Aachen 52074, GermanyInstitute for Plastics Processing (IKV), RWTH Aachen University, Aachen 52074, GermanyInstitute for Plastics Processing (IKV), RWTH Aachen University, Aachen 52074, GermanyThe modelling of the correlation between pressure, specific volume and temperature (pvT) of polymers is highly important for applications in the polymer processing of semi-crystalline thermoplastics, especially in injection moulding. In injection moulding, the polymer experiences a wide range of cooling rates, for example, 60 °C/min near the centre of the part and up to 3000 °C/min near the mould walls. The cooling rate has a high influence on the pvT behaviour, as was shown in the continuous two-domain pvT model (CTD). This work examined the Hoffman–Lauritzen nucleation and growth theory used in the modified Hammami model for extremely high cooling rates (up to 300,000 °C/min) by means of Flash differential scanning calorimeter (DSC) measurements. The results were compared to those of the empirical continuous two-domain pvT model. It is shown that the Hammami model is not suitable to predict the crystallisation kinetics of polypropylene at cooling rates above 600 °C/min, but that the continuous two-domain pvT model is well able to predict crystallisation temperatures at high cooling rates.https://www.mdpi.com/2073-4360/12/7/1515polypropylenematerial modelcrystallisation kineticspvT behaviourdifferential scanning calorimetry |
| spellingShingle | Jonathan Alms Christian Hopmann Jian Wang Tobias Hohlweck Non-Isothermal Crystallisation Kinetics of Polypropylene at High Cooling Rates and Comparison to the Continuous Two-Domain pvT Model Polymers polypropylene material model crystallisation kinetics pvT behaviour differential scanning calorimetry |
| title | Non-Isothermal Crystallisation Kinetics of Polypropylene at High Cooling Rates and Comparison to the Continuous Two-Domain pvT Model |
| title_full | Non-Isothermal Crystallisation Kinetics of Polypropylene at High Cooling Rates and Comparison to the Continuous Two-Domain pvT Model |
| title_fullStr | Non-Isothermal Crystallisation Kinetics of Polypropylene at High Cooling Rates and Comparison to the Continuous Two-Domain pvT Model |
| title_full_unstemmed | Non-Isothermal Crystallisation Kinetics of Polypropylene at High Cooling Rates and Comparison to the Continuous Two-Domain pvT Model |
| title_short | Non-Isothermal Crystallisation Kinetics of Polypropylene at High Cooling Rates and Comparison to the Continuous Two-Domain pvT Model |
| title_sort | non isothermal crystallisation kinetics of polypropylene at high cooling rates and comparison to the continuous two domain pvt model |
| topic | polypropylene material model crystallisation kinetics pvT behaviour differential scanning calorimetry |
| url | https://www.mdpi.com/2073-4360/12/7/1515 |
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