Pressure Equilibrium Time of a Cyclic-Olefin Copolymer
Integrative simulation techniques for predicting component properties, based on the conditions during processing, are becoming increasingly important. The calculation of orientations in injection molding, which, in addition to mechanical and optical properties, also affect the thermal shrinkage beha...
| Main Authors: | , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2021-07-01
|
| Series: | Polymers |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2073-4360/13/14/2309 |
| _version_ | 1797526261696823296 |
|---|---|
| author | Benedikt Roth Dietmar Drummer |
| author_facet | Benedikt Roth Dietmar Drummer |
| author_sort | Benedikt Roth |
| collection | DOAJ |
| description | Integrative simulation techniques for predicting component properties, based on the conditions during processing, are becoming increasingly important. The calculation of orientations in injection molding, which, in addition to mechanical and optical properties, also affect the thermal shrinkage behavior, are modeled on the basis of measurements that cannot take into account the pressure driven flow processes, which cause the orientations during the holding pressure phase. Previous investigations with a high-pressure capillary rheometer (HPC) and closed counter pressure chamber (CPC) showed the significant effect of a dynamically applied pressure on the flow behavior, depending on the temperature and the underlying compression rate. At a constant compression rate, an effective pressure difference between the measuring chamber and the CPC was observed, which resulted in a stop of flow through the capillary referred to as dynamic compression induced solidification. In order to extend the material understanding to the moment after dynamic solidification, an equilibrium time, which is needed until the pressure signals equalize, was evaluated and investigated in terms of a pressure, temperature and a possible compression rate dependency in this study. The findings show an exponential increase of the determined equilibrium time as a function of the holding pressure level and a decrease of the equilibrium time with increasing temperature. In case of supercritical compression in the area of a dynamic solidification, a compression rate dependency of the determined equilibrium times is also found. The measurement results show a temperature-invariant behavior, which allows the derivation of a master curve, according to the superposition principle, to calculate the pressure equilibrium time as a function of the holding pressure and the temperature. |
| first_indexed | 2024-03-10T09:27:42Z |
| format | Article |
| id | doaj.art-8f1bac8de2264ada893132a1ddfb006c |
| institution | Directory Open Access Journal |
| issn | 2073-4360 |
| language | English |
| last_indexed | 2024-03-10T09:27:42Z |
| publishDate | 2021-07-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Polymers |
| spelling | doaj.art-8f1bac8de2264ada893132a1ddfb006c2023-11-22T04:46:19ZengMDPI AGPolymers2073-43602021-07-011314230910.3390/polym13142309Pressure Equilibrium Time of a Cyclic-Olefin CopolymerBenedikt Roth0Dietmar Drummer1Institute of Polymer Technology, Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Am Weichselgarten 9, 91058 Erlangen, GermanyInstitute of Polymer Technology, Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Am Weichselgarten 9, 91058 Erlangen, GermanyIntegrative simulation techniques for predicting component properties, based on the conditions during processing, are becoming increasingly important. The calculation of orientations in injection molding, which, in addition to mechanical and optical properties, also affect the thermal shrinkage behavior, are modeled on the basis of measurements that cannot take into account the pressure driven flow processes, which cause the orientations during the holding pressure phase. Previous investigations with a high-pressure capillary rheometer (HPC) and closed counter pressure chamber (CPC) showed the significant effect of a dynamically applied pressure on the flow behavior, depending on the temperature and the underlying compression rate. At a constant compression rate, an effective pressure difference between the measuring chamber and the CPC was observed, which resulted in a stop of flow through the capillary referred to as dynamic compression induced solidification. In order to extend the material understanding to the moment after dynamic solidification, an equilibrium time, which is needed until the pressure signals equalize, was evaluated and investigated in terms of a pressure, temperature and a possible compression rate dependency in this study. The findings show an exponential increase of the determined equilibrium time as a function of the holding pressure level and a decrease of the equilibrium time with increasing temperature. In case of supercritical compression in the area of a dynamic solidification, a compression rate dependency of the determined equilibrium times is also found. The measurement results show a temperature-invariant behavior, which allows the derivation of a master curve, according to the superposition principle, to calculate the pressure equilibrium time as a function of the holding pressure and the temperature.https://www.mdpi.com/2073-4360/13/14/2309compression induced solidificationcyclic-olefin copolymersequilibrium timehigh-pressure capillary rheometercounter pressure chamber |
| spellingShingle | Benedikt Roth Dietmar Drummer Pressure Equilibrium Time of a Cyclic-Olefin Copolymer Polymers compression induced solidification cyclic-olefin copolymers equilibrium time high-pressure capillary rheometer counter pressure chamber |
| title | Pressure Equilibrium Time of a Cyclic-Olefin Copolymer |
| title_full | Pressure Equilibrium Time of a Cyclic-Olefin Copolymer |
| title_fullStr | Pressure Equilibrium Time of a Cyclic-Olefin Copolymer |
| title_full_unstemmed | Pressure Equilibrium Time of a Cyclic-Olefin Copolymer |
| title_short | Pressure Equilibrium Time of a Cyclic-Olefin Copolymer |
| title_sort | pressure equilibrium time of a cyclic olefin copolymer |
| topic | compression induced solidification cyclic-olefin copolymers equilibrium time high-pressure capillary rheometer counter pressure chamber |
| url | https://www.mdpi.com/2073-4360/13/14/2309 |
| work_keys_str_mv | AT benediktroth pressureequilibriumtimeofacyclicolefincopolymer AT dietmardrummer pressureequilibriumtimeofacyclicolefincopolymer |