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Yaman M, Lu P, Vasanthan N. Crystal-to-Crystal Transition and the Structure Development of Electrospun Poly(ethylene 2,6 naphthalate) (PEN) Nanofibers from Solution. J Phys Chem B 2019; 123:5954-5961. [PMID: 31250640 DOI: 10.1021/acs.jpcb.9b04278] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Poly(ethylene naphthalate) (PEN) nanofiber membranes were prepared using hexafluoroisopropanol (HFIP) as a solvent. Crystallization and conformation of PEN nanofibers were characterized for the first time by scanning electron microscopy (SEM), differential scanning calorimetry (DSC), Fourier transform infrared spectroscopy (FTIR), and Raman spectroscopy. SEM micrographs revealed that the size and uniformity of nanofibers depended on the PEN concentration in HFIP solution. DSC results showed that cold crystallization temperature (Tcc) decreased and the crystallinity of PEN nanofibers increased with increasing the concentration of spinning PEN/HFIP solution. FTIR and Raman spectroscopies showed that PEN nanofibers formed metastable β-crystals during electrospinning due to the fast evaporation of a solvent, while the concentration of spinning solution did not affect the crystal form of as-prepared PEN nanofibers. Upon annealing of PEN nanofiber membranes above 140 °C, metastable β-crystals were transformed into the thermodynamically most stable α-crystals. Our polarized FTIR spectroscopic studies revealed that no molecular orientation was developed when fibers were collected randomly.
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Affiliation(s)
- Murat Yaman
- Department of Chemistry and Biochemistry , Long Island University , One University Plaza , Brooklyn , New York 11201 , United States
| | - Ping Lu
- Department of Chemistry and Biochemistry , Long Island University , One University Plaza , Brooklyn , New York 11201 , United States
| | - Nadarajah Vasanthan
- Department of Chemistry and Biochemistry , Long Island University , One University Plaza , Brooklyn , New York 11201 , United States
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Wu N, Ding M, Li C, Yuan Y, Zhang J. Lamellar Orientation and Crystallization Dynamics of Poly (l-Lactic Acid) Thin Films Investigated by In-Situ Reflection Absorption Infrared Spectroscopy. J Phys Chem B 2011; 115:11548-53. [DOI: 10.1021/jp203110u] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Ningjing Wu
- Key Laboratory of Rubber-Plastics, Ministry of Education/Shandong Provincial Key Laboratory of Rubber-plastics, Qingdao University of Science & Technology, Qingdao City 266042, People’s Republic of China
| | - Meichun Ding
- Key Laboratory of Rubber-Plastics, Ministry of Education/Shandong Provincial Key Laboratory of Rubber-plastics, Qingdao University of Science & Technology, Qingdao City 266042, People’s Republic of China
| | - Chenwei Li
- Key Laboratory of Rubber-Plastics, Ministry of Education/Shandong Provincial Key Laboratory of Rubber-plastics, Qingdao University of Science & Technology, Qingdao City 266042, People’s Republic of China
| | - Yuan Yuan
- Key Laboratory of Rubber-Plastics, Ministry of Education/Shandong Provincial Key Laboratory of Rubber-plastics, Qingdao University of Science & Technology, Qingdao City 266042, People’s Republic of China
| | - Jianming Zhang
- Key Laboratory of Rubber-Plastics, Ministry of Education/Shandong Provincial Key Laboratory of Rubber-plastics, Qingdao University of Science & Technology, Qingdao City 266042, People’s Republic of China
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Linares A, Nogales A, Sanz A, Ezquerra TA, Pieruccini M. Restricted dynamics in oriented semicrystalline polymers: poly(vinilydene fluoride). PHYSICAL REVIEW. E, STATISTICAL, NONLINEAR, AND SOFT MATTER PHYSICS 2010; 82:031802. [PMID: 21230096 DOI: 10.1103/physreve.82.031802] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/12/2010] [Revised: 06/08/2010] [Indexed: 05/30/2023]
Abstract
The effect of confinement by crystals on the α relaxation, observed by dielectric broadband spectroscopy, in isotropic as well as in oriented semicrystalline poly(vinilydene fluoride), is analyzed on the basis of a new thermodynamic model. In both samples, it has been found that the average free-energy barrier, ΔF, for conformational rearrangements is of the same order of the dispersion barrier heights, δ(ΔF), around ΔF, i.e., the increase in the barrier height in conformational rearrangement is accompanied by an increase in the heterogeneity of constraining conditions. At a given temperature T, the readjustment free energy is larger in the oriented sample. This fact might be ascribed to either an enhanced effectiveness of confinement in the amorphous region due to the decrease of the amorphous layer thickness in the stacks, or to a change of the mean chain orientation or both. In addition, it is worth noting that in oriented poly(vinilydene fluoride) the regions of cooperative rearrangement are significantly larger. Moreover, independent of orientation, the size of these readjusting regions increase upon decreasing T. This feature, which underlies the Adam-Gibbs approach for liquids, is pointed out for the first time from direct data analysis in the case of confinement enhanced cooperativity. In addition to the above analysis, the samples have been characterized by differential scanning calorimetry, wide angle x-ray scattering, and small angle x-ray scattering.
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Affiliation(s)
- Amelia Linares
- Instituto de Estructura de la Materia, CSIC, C/ Serrano, 121, 28006 Madrid, Spain.
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Dong H, Li H, Wang E, Yan S, Zhang J, Yang C, Takahashi I, Nakashima H, Torimitsu K, Hu W. Molecular Orientation and Field-effect Transistors of a Rigid Rod Conjugated Polymer Thin Films. J Phys Chem B 2009; 113:4176-80. [DOI: 10.1021/jp811374h] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Huanli Dong
- Beijing National Laboratory for Molecular Sciences, Key Laboratory of Organic Solids and State Key Laboratory of Polymer Physics and Chemistry, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, People’s Republic of China, Department of Physics, School of Science and Technology, Kwansei Gakuin University, Sanda, Hyogo 669-1337, Japan, and NTT Basic Research Laboratories, NTT Corporation, 3-1 Morinosato Wakamiya, Atsugi, Kanagawa 243−0198, Japan
| | - Hongxiang Li
- Beijing National Laboratory for Molecular Sciences, Key Laboratory of Organic Solids and State Key Laboratory of Polymer Physics and Chemistry, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, People’s Republic of China, Department of Physics, School of Science and Technology, Kwansei Gakuin University, Sanda, Hyogo 669-1337, Japan, and NTT Basic Research Laboratories, NTT Corporation, 3-1 Morinosato Wakamiya, Atsugi, Kanagawa 243−0198, Japan
| | - Erjing Wang
- Beijing National Laboratory for Molecular Sciences, Key Laboratory of Organic Solids and State Key Laboratory of Polymer Physics and Chemistry, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, People’s Republic of China, Department of Physics, School of Science and Technology, Kwansei Gakuin University, Sanda, Hyogo 669-1337, Japan, and NTT Basic Research Laboratories, NTT Corporation, 3-1 Morinosato Wakamiya, Atsugi, Kanagawa 243−0198, Japan
| | - Shouke Yan
- Beijing National Laboratory for Molecular Sciences, Key Laboratory of Organic Solids and State Key Laboratory of Polymer Physics and Chemistry, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, People’s Republic of China, Department of Physics, School of Science and Technology, Kwansei Gakuin University, Sanda, Hyogo 669-1337, Japan, and NTT Basic Research Laboratories, NTT Corporation, 3-1 Morinosato Wakamiya, Atsugi, Kanagawa 243−0198, Japan
| | - Jianming Zhang
- Beijing National Laboratory for Molecular Sciences, Key Laboratory of Organic Solids and State Key Laboratory of Polymer Physics and Chemistry, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, People’s Republic of China, Department of Physics, School of Science and Technology, Kwansei Gakuin University, Sanda, Hyogo 669-1337, Japan, and NTT Basic Research Laboratories, NTT Corporation, 3-1 Morinosato Wakamiya, Atsugi, Kanagawa 243−0198, Japan
| | - Chunming Yang
- Beijing National Laboratory for Molecular Sciences, Key Laboratory of Organic Solids and State Key Laboratory of Polymer Physics and Chemistry, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, People’s Republic of China, Department of Physics, School of Science and Technology, Kwansei Gakuin University, Sanda, Hyogo 669-1337, Japan, and NTT Basic Research Laboratories, NTT Corporation, 3-1 Morinosato Wakamiya, Atsugi, Kanagawa 243−0198, Japan
| | - Isao Takahashi
- Beijing National Laboratory for Molecular Sciences, Key Laboratory of Organic Solids and State Key Laboratory of Polymer Physics and Chemistry, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, People’s Republic of China, Department of Physics, School of Science and Technology, Kwansei Gakuin University, Sanda, Hyogo 669-1337, Japan, and NTT Basic Research Laboratories, NTT Corporation, 3-1 Morinosato Wakamiya, Atsugi, Kanagawa 243−0198, Japan
| | - Hiroshi Nakashima
- Beijing National Laboratory for Molecular Sciences, Key Laboratory of Organic Solids and State Key Laboratory of Polymer Physics and Chemistry, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, People’s Republic of China, Department of Physics, School of Science and Technology, Kwansei Gakuin University, Sanda, Hyogo 669-1337, Japan, and NTT Basic Research Laboratories, NTT Corporation, 3-1 Morinosato Wakamiya, Atsugi, Kanagawa 243−0198, Japan
| | - Keiichi Torimitsu
- Beijing National Laboratory for Molecular Sciences, Key Laboratory of Organic Solids and State Key Laboratory of Polymer Physics and Chemistry, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, People’s Republic of China, Department of Physics, School of Science and Technology, Kwansei Gakuin University, Sanda, Hyogo 669-1337, Japan, and NTT Basic Research Laboratories, NTT Corporation, 3-1 Morinosato Wakamiya, Atsugi, Kanagawa 243−0198, Japan
| | - Wenping Hu
- Beijing National Laboratory for Molecular Sciences, Key Laboratory of Organic Solids and State Key Laboratory of Polymer Physics and Chemistry, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, People’s Republic of China, Department of Physics, School of Science and Technology, Kwansei Gakuin University, Sanda, Hyogo 669-1337, Japan, and NTT Basic Research Laboratories, NTT Corporation, 3-1 Morinosato Wakamiya, Atsugi, Kanagawa 243−0198, Japan
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