Structural Characteristics of Fibrillar Crystals in Uniaxially Stretched Isotactic Polypropylene Dominated by Temperature and Strain
Abstract The spherulitic morphology of isotactic polypropylene can be transformed into the oriented fibrillar morphology through hot stretching processes with varying temperature (Ts) or altering strain (εt). The effects of Ts and εt on the structural characteristics of fibrillar crystals are compre...
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| Format: | Article |
| Language: | English |
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Wiley-VCH
2024-11-01
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| Series: | Macromolecular Materials and Engineering |
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| Online Access: | https://doi.org/10.1002/mame.202300448 |
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| author | Hao Lin Jiang Guo Xiang Huang Shengbao Jiang Mengyi Xu |
| author_facet | Hao Lin Jiang Guo Xiang Huang Shengbao Jiang Mengyi Xu |
| author_sort | Hao Lin |
| collection | DOAJ |
| description | Abstract The spherulitic morphology of isotactic polypropylene can be transformed into the oriented fibrillar morphology through hot stretching processes with varying temperature (Ts) or altering strain (εt). The effects of Ts and εt on the structural characteristics of fibrillar crystals are comprehensively investigated with respect to crystal orientation, long periodic spacing, lamellar thickness (Lc), crystallinity (Xc), melting point, and chain relaxation behavior. Small‐angle X‐ray scattering patterns illustrate that the fibrillar crystals consist of alternated stacks of crystalline lamellae and amorphous layers. High Ts leads to a low orientation degree of lamellae, whereas large εt facilitates a high orientation level. The Xc and mean Lc are improved continuously with the increasing of Ts or εt, indicating a stretching‐enhanced crystallization behavior driven by the two factors. The endothermic profiles reveal that new chain‐folded lamellae with relatively thinner thickness form during the hot stretching process. The formation of thinner lamellae is dominated by the melting–recrystallization mechanism. This work would provide guidance for optimizing process conditions to manipulate the microstructure of hot‐stretched semicrystalline polymers. |
| format | Article |
| id | doaj-art-4058fca4de79416697938134834b3c41 |
| institution | Kabale University |
| issn | 1438-7492 1439-2054 |
| language | English |
| publishDate | 2024-11-01 |
| publisher | Wiley-VCH |
| record_format | Article |
| series | Macromolecular Materials and Engineering |
| spelling | doaj-art-4058fca4de79416697938134834b3c412024-11-15T15:14:54ZengWiley-VCHMacromolecular Materials and Engineering1438-74921439-20542024-11-0130911n/an/a10.1002/mame.202300448Structural Characteristics of Fibrillar Crystals in Uniaxially Stretched Isotactic Polypropylene Dominated by Temperature and StrainHao Lin0Jiang Guo1Xiang Huang2Shengbao Jiang3Mengyi Xu4High Voltage Department China Electric Power Research Institute Wuhan 430074 P. R. ChinaHigh Voltage Department China Electric Power Research Institute Wuhan 430074 P. R. ChinaHigh Voltage Department China Electric Power Research Institute Wuhan 430074 P. R. ChinaHigh Voltage Department China Electric Power Research Institute Wuhan 430074 P. R. ChinaHigh Voltage Department China Electric Power Research Institute Wuhan 430074 P. R. ChinaAbstract The spherulitic morphology of isotactic polypropylene can be transformed into the oriented fibrillar morphology through hot stretching processes with varying temperature (Ts) or altering strain (εt). The effects of Ts and εt on the structural characteristics of fibrillar crystals are comprehensively investigated with respect to crystal orientation, long periodic spacing, lamellar thickness (Lc), crystallinity (Xc), melting point, and chain relaxation behavior. Small‐angle X‐ray scattering patterns illustrate that the fibrillar crystals consist of alternated stacks of crystalline lamellae and amorphous layers. High Ts leads to a low orientation degree of lamellae, whereas large εt facilitates a high orientation level. The Xc and mean Lc are improved continuously with the increasing of Ts or εt, indicating a stretching‐enhanced crystallization behavior driven by the two factors. The endothermic profiles reveal that new chain‐folded lamellae with relatively thinner thickness form during the hot stretching process. The formation of thinner lamellae is dominated by the melting–recrystallization mechanism. This work would provide guidance for optimizing process conditions to manipulate the microstructure of hot‐stretched semicrystalline polymers.https://doi.org/10.1002/mame.202300448fibrillar crystalhot stretchinglamellar structurepolypropylenestraintemperature |
| spellingShingle | Hao Lin Jiang Guo Xiang Huang Shengbao Jiang Mengyi Xu Structural Characteristics of Fibrillar Crystals in Uniaxially Stretched Isotactic Polypropylene Dominated by Temperature and Strain Macromolecular Materials and Engineering fibrillar crystal hot stretching lamellar structure polypropylene strain temperature |
| title | Structural Characteristics of Fibrillar Crystals in Uniaxially Stretched Isotactic Polypropylene Dominated by Temperature and Strain |
| title_full | Structural Characteristics of Fibrillar Crystals in Uniaxially Stretched Isotactic Polypropylene Dominated by Temperature and Strain |
| title_fullStr | Structural Characteristics of Fibrillar Crystals in Uniaxially Stretched Isotactic Polypropylene Dominated by Temperature and Strain |
| title_full_unstemmed | Structural Characteristics of Fibrillar Crystals in Uniaxially Stretched Isotactic Polypropylene Dominated by Temperature and Strain |
| title_short | Structural Characteristics of Fibrillar Crystals in Uniaxially Stretched Isotactic Polypropylene Dominated by Temperature and Strain |
| title_sort | structural characteristics of fibrillar crystals in uniaxially stretched isotactic polypropylene dominated by temperature and strain |
| topic | fibrillar crystal hot stretching lamellar structure polypropylene strain temperature |
| url | https://doi.org/10.1002/mame.202300448 |
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