Crystallization Behavior of Isotactic Polybutene Blended with Polyethylene
In this work, the melt crystallization behavior and the solid phase transition of isotactic polybutene (PB) were studied in the polybutene/high-density polyethylene (PB/PE) blends covering the whole composition range. For the dynamic cooling crystallization, PE exhibits almost the same crystallizati...
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| Format: | Article |
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MDPI AG
2022-04-01
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| Series: | Molecules |
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| Online Access: | https://www.mdpi.com/1420-3049/27/8/2448 |
| _version_ | 1797434385573609472 |
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| author | Jiajia Ping Guiqiu Ma Zhe Ma |
| author_facet | Jiajia Ping Guiqiu Ma Zhe Ma |
| author_sort | Jiajia Ping |
| collection | DOAJ |
| description | In this work, the melt crystallization behavior and the solid phase transition of isotactic polybutene (PB) were studied in the polybutene/high-density polyethylene (PB/PE) blends covering the whole composition range. For the dynamic cooling crystallization, PE exhibits almost the same crystallization temperature in all blends, whereas PB exhibits a distinct non-monotonic dependence on the composition ratio. Combining the ex situ X-ray diffraction and in situ Fourier transform infrared spectroscope, it was demonstrated that during cooling at 10 °C/min, the presence of at least 70 wt% PE can induce the formation of form I′ directly from the amorphous melt. The detailed relations of polymorphism with temperature were systematically investigated for the PB/PE blends. Different from the formation of the sole tetragonal phase with ≤50 wt% PE, the trigonal form I′ could crystallize directly from amorphous melt with ≥60 wt% PE, which can be further enhanced by elevating the temperature of isothermal crystallization. Interestingly, the critical lowest temperature of obtaining pure form I′ was 85 °C with 70 wt% PE and decreased to 80 °C as the PE fraction was increased to 80 wt%. On the other hand, the spontaneous phase transition from the kinetically favored form II into the thermodynamically stable form I was also explored with X-ray diffraction methods. It was found that at the room temperature, phase transition kinetics can be significantly accelerated by blending at least 70 wt% PE. |
| first_indexed | 2024-03-09T10:31:28Z |
| format | Article |
| id | doaj.art-be2b76c0343b431bb8169fc4de544e40 |
| institution | Directory Open Access Journal |
| issn | 1420-3049 |
| language | English |
| last_indexed | 2024-03-09T10:31:28Z |
| publishDate | 2022-04-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Molecules |
| spelling | doaj.art-be2b76c0343b431bb8169fc4de544e402023-12-01T21:15:57ZengMDPI AGMolecules1420-30492022-04-01278244810.3390/molecules27082448Crystallization Behavior of Isotactic Polybutene Blended with PolyethyleneJiajia Ping0Guiqiu Ma1Zhe Ma2Tianjin Key Laboratory of Composite and Functional Materials, School of Materials Science and Engineering, Tianjin University, Tianjin 300072, ChinaTianjin Key Laboratory of Composite and Functional Materials, School of Materials Science and Engineering, Tianjin University, Tianjin 300072, ChinaTianjin Key Laboratory of Composite and Functional Materials, School of Materials Science and Engineering, Tianjin University, Tianjin 300072, ChinaIn this work, the melt crystallization behavior and the solid phase transition of isotactic polybutene (PB) were studied in the polybutene/high-density polyethylene (PB/PE) blends covering the whole composition range. For the dynamic cooling crystallization, PE exhibits almost the same crystallization temperature in all blends, whereas PB exhibits a distinct non-monotonic dependence on the composition ratio. Combining the ex situ X-ray diffraction and in situ Fourier transform infrared spectroscope, it was demonstrated that during cooling at 10 °C/min, the presence of at least 70 wt% PE can induce the formation of form I′ directly from the amorphous melt. The detailed relations of polymorphism with temperature were systematically investigated for the PB/PE blends. Different from the formation of the sole tetragonal phase with ≤50 wt% PE, the trigonal form I′ could crystallize directly from amorphous melt with ≥60 wt% PE, which can be further enhanced by elevating the temperature of isothermal crystallization. Interestingly, the critical lowest temperature of obtaining pure form I′ was 85 °C with 70 wt% PE and decreased to 80 °C as the PE fraction was increased to 80 wt%. On the other hand, the spontaneous phase transition from the kinetically favored form II into the thermodynamically stable form I was also explored with X-ray diffraction methods. It was found that at the room temperature, phase transition kinetics can be significantly accelerated by blending at least 70 wt% PE.https://www.mdpi.com/1420-3049/27/8/2448polybuteneblendscrystallizationpolymorphismphase transition |
| spellingShingle | Jiajia Ping Guiqiu Ma Zhe Ma Crystallization Behavior of Isotactic Polybutene Blended with Polyethylene Molecules polybutene blends crystallization polymorphism phase transition |
| title | Crystallization Behavior of Isotactic Polybutene Blended with Polyethylene |
| title_full | Crystallization Behavior of Isotactic Polybutene Blended with Polyethylene |
| title_fullStr | Crystallization Behavior of Isotactic Polybutene Blended with Polyethylene |
| title_full_unstemmed | Crystallization Behavior of Isotactic Polybutene Blended with Polyethylene |
| title_short | Crystallization Behavior of Isotactic Polybutene Blended with Polyethylene |
| title_sort | crystallization behavior of isotactic polybutene blended with polyethylene |
| topic | polybutene blends crystallization polymorphism phase transition |
| url | https://www.mdpi.com/1420-3049/27/8/2448 |
| work_keys_str_mv | AT jiajiaping crystallizationbehaviorofisotacticpolybuteneblendedwithpolyethylene AT guiqiuma crystallizationbehaviorofisotacticpolybuteneblendedwithpolyethylene AT zhema crystallizationbehaviorofisotacticpolybuteneblendedwithpolyethylene |