The evolution of macromolecular packing and sudden crystallization in rigid-rod polyimide via effect of multiple H-bonding on charge transfer (CT) interactions

Luo, Longbo; Yao, Jinping; Wang, Xu; Li, Ké; Huang, Jieyang; Li, Baoyin; Wang, Huina; Yan, Feng; Li, Xiangyang

doi:10.1016/j.polymer.2014.06.080

Cited by 99 publications

(115 citation statements)

References 60 publications

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“…17,27 Two-dimensional small angle X-ray scattering (2D SAXS) was performed on NanoSTAR-U (BRUKER AXS INC) using an HI-STAR detector. The generator was operated at 40 kV and 650 mA with Cu Ka radiation.…”

Section: Characterizationmentioning

confidence: 99%

“…However, as for two-step wet-spinning method, some defects such as microvoids could be generated during dualdiffusion and thermal imidization process. [16][17][18][19] It was reported that the incorporated 4,4 0 -oxydiphthalic anhydride (ODPA) moieties into the BPDA/p-PDA polymer backbone resulted in the reduced size of the microvoids in the bers, which was the main reason for the dramatically enhancement in the mechanical properties of the bers. 20 Therefore, controlling the size of microvoids is especially essential in determining the nal performance of the PI bers.…”

Section: Introductionmentioning

confidence: 99%

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Effect of pre-imidization on the structures and properties of polyimide fibers

Chang

Zhang

et al. 2015

RSC Adv.

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A series of polyimide (PI) fibers derived from 3,3 0 ,4,4 0 -biphenyltetracarboxylic dianhydride (BPDA), 4,4 0 -oxydiphthalic anhydride (ODPA) and p-phenylenediamine (p-PDA) were successfully prepared through a partially pre-imidization process, and the effects of different amount of dehydration reagents and initial poly(amic acid) (PAA) concentrations on the structure-property relationship of the resultant PI fibers were systematically investigated. The results showed that both the increased amount of dehydration reagents and PAA concentration could result in the ordered molecular packing arrangement of the polymer chains and gradually formed homogeneous structures in the fibers, which are proposed to be essentially dominated for the effectively enhancement in the mechanical properties of PI fibers. Moreover, the PI fibers obtained through the pre-imidization process still exhibited excellent thermaloxidative stabilities, although the 5% weight loss temperature of the PI fibers was slightly decreased compared with that of the pure PI fibers as a result of the residual dehydration reagents in the fibers.Consequently, the present work provided a new approach in preparing high-performance PI fibers through a partially pre-imidization process.

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Section: Characterizationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of pre-imidization on the structures and properties of polyimide fibers

Chang

Zhang

et al. 2015

RSC Adv.

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“…In our previous article, the homopolyimide (homo‐PI) fibers containing benzimidazole and containing benzoxazole were prepared and the crystallization behavior of two fibers was studied. In this paper, the benzimidazole and benzoxazole rings were introduced into the backbone of PIs via copolymerization in an attempt to obtain new PI fiber with excellent mechanical properties and thermal properties.…”

Section: Introductionmentioning

confidence: 99%

High‐performance copoly(benzimidazole‐benzoxazole‐imide) fibers: Fabrication, structure, and properties

Luo

Zheng

Huang

et al. 2015

J of Applied Polymer Sci

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Novel high‐performance copolyimide (co‐PI) fibers containing benzimidazole and benzoxazole ring in the main chain were prepared by a two‐step spinning via the poly(amic acid)s. Effects of the incorporated benzimidazole and benzoxazole units on the micro‐structure and properties of co‐PI fibers were investigated. Fourier transform infrared (FTIR) results indicated that hydrogen bonding is formed in the co‐PI fibers. The co‐PI fibers exhibited discernible crystallization peaks at 14°∼15° and 23°∼26° (2θ), showing crystalline‐like structure. Moreover, the packing type of benzimidazole‐imide units determined the macromolecules packing of co‐PIs. It was amazedly found that the co‐PI fibers exhibited higher tensile strength and initial modulus than those of corresponding homo‐PI fibers, reaching tensile strength of 2.2–2.6 GPa, initial modulus of 99.1–113.2 GPa. The results of dynamic mechanical analysis (DMA) indicated co‐PI2 fiber had a positive Tg deviation due to the presence of strong intermolecular hydrogen bonding between benzimidazole‐imide and benzoxazole‐imide units, which maybe lead to the effective stress transfer between benzimidazole‐imide units and benzoxazole‐imide units. In addition, the obtained PI fibers exhibited excellent thermal properties with the 10% weight loss temperatures under N2 in the range of 574–585°C. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015, 132, 42001.

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“…The microstructures of Si-Ti-Fe-Al alloy particles were observed with a field emission scanning electron microscopy (FESEM, JEOL JSM-7000F, Akishima, Japan) and a high-resolution transmission electron microscopy (HR-TEM, JEOL 2100F). 29,35,36 To further understand the effect of thermal treatment on the electrochemical performance of Si-alloy/PAI electrodes with respect to heat treatment temperature, real time electrochemical dilatometric characterization was performed using in-situ dilatometer. In order to characterize the crystal structure of the materials, X-ray diffraction analysis (XRD, Empyrean, PANalytical, Almelo, the Netherlands) was used.…”

Section: Methodsmentioning

confidence: 99%

Real‐Time Dilation Observation of Si‐Alloy Electrode Using Thermally Treated Poly (Amide‐Imide) as a Binder for Lithium Ion Battery

Park

Lee

Chung

et al. 2019

Bulletin Korean Chem Soc

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Real time dilation behaviors of a Si-Ti-Fe-Al alloy electrode adopting a poly (amide-imide) binder were investigated to understand the effects of thermal treatment temperature for PAI binder on the electrochemical performance of the Si-alloy electrode using an in-situ electrochemical dilatometer. In situ measurement of the electrode thickness showed that the changes in the volume of the Si electrode was suppressed by heat treatment greater than 300 C, which well agreed with the improved cycle performance of the Sialloy electrode thermally treated at the same temperature. Differential dilation plots of the Si-alloy electrodes were found to reveal more detailed changes in the volume of the Si-alloy electrode, thus showing that the enhanced mechanical strength of thermally treated PAI effectively could control the expansion and contraction of the Si-alloy electrode and ensuring a more stable cycle performance of the Si-alloy electrode.

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The evolution of macromolecular packing and sudden crystallization in rigid-rod polyimide via effect of multiple H-bonding on charge transfer (CT) interactions

Cited by 99 publications

References 60 publications

Effect of pre-imidization on the structures and properties of polyimide fibers

Effect of pre-imidization on the structures and properties of polyimide fibers

High‐performance copoly(benzimidazole‐benzoxazole‐imide) fibers: Fabrication, structure, and properties

Real‐Time Dilation Observation of Si‐Alloy Electrode Using Thermally Treated Poly (Amide‐Imide) as a Binder for Lithium Ion Battery

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