Insight into the Influence of Properties of Poly(Ethylene-co-octene) with Different Chain Structures on Their Cell Morphology and Dimensional Stability Foamed by Supercritical CO<sub>2</sub>
Poly(ethylene-co-octene) (POE) elastomers with different copolymer compositions and molecular weight exhibit quite distinctive foaming behaviors and dimensional stability using supercritical carbon dioxide (CO<sub>2</sub>) as a blowing agent. As the octene content decreases from 16.54% t...
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MDPI AG
2021-05-01
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| Series: | Polymers |
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| Online Access: | https://www.mdpi.com/2073-4360/13/9/1494 |
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| author | Dongyang Li Yichong Chen Shun Yao Hong Zhang Dongdong Hu Ling Zhao |
| author_facet | Dongyang Li Yichong Chen Shun Yao Hong Zhang Dongdong Hu Ling Zhao |
| author_sort | Dongyang Li |
| collection | DOAJ |
| description | Poly(ethylene-co-octene) (POE) elastomers with different copolymer compositions and molecular weight exhibit quite distinctive foaming behaviors and dimensional stability using supercritical carbon dioxide (CO<sub>2</sub>) as a blowing agent. As the octene content decreases from 16.54% to 4.48% with constant melting index of 1, both the melting point and crystallinity of POE increase, due to the increase in fraction of ethylene homo-polymerization segment. the foaming window of POE moves to a narrow higher temperature zone from 20–50 °C to 90–110 °C under 11 Mpa CO<sub>2</sub> pressure, and CO<sub>2</sub> solubility as well as CO<sub>2</sub> desorption rate decrease, so that the average cell diameter becomes larger. POE foams with higher octene content have more serious shrinkage problem due to lower compression modulus, weaker crystal structure and higher CO<sub>2</sub> permeability. As POE molecular weight increases at similar octene content, there is little effect on crystallization and CO<sub>2</sub> diffusion behavior, the foaming window becomes wider and cell density increases, mainly owing to higher polymer melt strength, the volume shrinkage ratio of their foams is less than 20% because of similar higher polymer modulus. In addition, when the initiate expansion ratio is over 17 times, POE foams with longer and thinner cell wall structures are more prone to shrinkage and recovery during aging process, due to more bending deformation and less compression deformation. |
| first_indexed | 2024-03-10T11:39:44Z |
| format | Article |
| id | doaj.art-25f42ec218604b30b5a4373ed4f06b70 |
| institution | Directory Open Access Journal |
| issn | 2073-4360 |
| language | English |
| last_indexed | 2024-03-10T11:39:44Z |
| publishDate | 2021-05-01 |
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| series | Polymers |
| spelling | doaj.art-25f42ec218604b30b5a4373ed4f06b702023-11-21T18:34:49ZengMDPI AGPolymers2073-43602021-05-01139149410.3390/polym13091494Insight into the Influence of Properties of Poly(Ethylene-co-octene) with Different Chain Structures on Their Cell Morphology and Dimensional Stability Foamed by Supercritical CO<sub>2</sub>Dongyang Li0Yichong Chen1Shun Yao2Hong Zhang3Dongdong Hu4Ling Zhao5State Key Laboratory of Chemical Engineering, East China University of Science and Technology, Shanghai 200237, ChinaState Key Laboratory of Chemical Engineering, East China University of Science and Technology, Shanghai 200237, ChinaState Key Laboratory of Chemical Engineering, East China University of Science and Technology, Shanghai 200237, ChinaState Key Laboratory of Chemical Engineering, East China University of Science and Technology, Shanghai 200237, ChinaState Key Laboratory of Chemical Engineering, East China University of Science and Technology, Shanghai 200237, ChinaState Key Laboratory of Chemical Engineering, East China University of Science and Technology, Shanghai 200237, ChinaPoly(ethylene-co-octene) (POE) elastomers with different copolymer compositions and molecular weight exhibit quite distinctive foaming behaviors and dimensional stability using supercritical carbon dioxide (CO<sub>2</sub>) as a blowing agent. As the octene content decreases from 16.54% to 4.48% with constant melting index of 1, both the melting point and crystallinity of POE increase, due to the increase in fraction of ethylene homo-polymerization segment. the foaming window of POE moves to a narrow higher temperature zone from 20–50 °C to 90–110 °C under 11 Mpa CO<sub>2</sub> pressure, and CO<sub>2</sub> solubility as well as CO<sub>2</sub> desorption rate decrease, so that the average cell diameter becomes larger. POE foams with higher octene content have more serious shrinkage problem due to lower compression modulus, weaker crystal structure and higher CO<sub>2</sub> permeability. As POE molecular weight increases at similar octene content, there is little effect on crystallization and CO<sub>2</sub> diffusion behavior, the foaming window becomes wider and cell density increases, mainly owing to higher polymer melt strength, the volume shrinkage ratio of their foams is less than 20% because of similar higher polymer modulus. In addition, when the initiate expansion ratio is over 17 times, POE foams with longer and thinner cell wall structures are more prone to shrinkage and recovery during aging process, due to more bending deformation and less compression deformation.https://www.mdpi.com/2073-4360/13/9/1494poly(ethylene-co-octene)supercritical carbon dioxidefoaming behaviorshrinkage behaviorcrystallizationCO<sub>2</sub> solubility |
| spellingShingle | Dongyang Li Yichong Chen Shun Yao Hong Zhang Dongdong Hu Ling Zhao Insight into the Influence of Properties of Poly(Ethylene-co-octene) with Different Chain Structures on Their Cell Morphology and Dimensional Stability Foamed by Supercritical CO<sub>2</sub> Polymers poly(ethylene-co-octene) supercritical carbon dioxide foaming behavior shrinkage behavior crystallization CO<sub>2</sub> solubility |
| title | Insight into the Influence of Properties of Poly(Ethylene-co-octene) with Different Chain Structures on Their Cell Morphology and Dimensional Stability Foamed by Supercritical CO<sub>2</sub> |
| title_full | Insight into the Influence of Properties of Poly(Ethylene-co-octene) with Different Chain Structures on Their Cell Morphology and Dimensional Stability Foamed by Supercritical CO<sub>2</sub> |
| title_fullStr | Insight into the Influence of Properties of Poly(Ethylene-co-octene) with Different Chain Structures on Their Cell Morphology and Dimensional Stability Foamed by Supercritical CO<sub>2</sub> |
| title_full_unstemmed | Insight into the Influence of Properties of Poly(Ethylene-co-octene) with Different Chain Structures on Their Cell Morphology and Dimensional Stability Foamed by Supercritical CO<sub>2</sub> |
| title_short | Insight into the Influence of Properties of Poly(Ethylene-co-octene) with Different Chain Structures on Their Cell Morphology and Dimensional Stability Foamed by Supercritical CO<sub>2</sub> |
| title_sort | insight into the influence of properties of poly ethylene co octene with different chain structures on their cell morphology and dimensional stability foamed by supercritical co sub 2 sub |
| topic | poly(ethylene-co-octene) supercritical carbon dioxide foaming behavior shrinkage behavior crystallization CO<sub>2</sub> solubility |
| url | https://www.mdpi.com/2073-4360/13/9/1494 |
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