Strain-induced crystallization of polyimide fibers containing 2-(4-aminophenyl)-5-aminobenzimidazole moiety

Yin, Chaoqing; Dong, Jie; Tan, Wenjun; Lin, Jinyou; Chen, Dajun

doi:10.1016/j.polymer.2015.08.025

Cited by 56 publications

(38 citation statements)

References 47 publications

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“…As we know, shape recovery is closely related to the microstructure of polymers, including the chain stacking order and intermolecular interaction. Previous report showed that heat‐drawing could change the aggregation structure of polyimide fiber, thus enhancing the physical properties . To investigate the influence of shape memory cycles on the chain packing and orientation of macromolecular chain, the sample was removed from the dynamic mechanical analyzer after the first, second, and third shape memory cycle, that was used to obtain 2D‐WAXD pattern (Fig.…”

Section: Resultsmentioning

confidence: 99%

Shape memory induced structural evolution of high performance copolyimides

Yang

Song

Wang

et al. 2016

J. Polym. Sci. Part A: Polym. Chem.

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In this work, two kinds of high temperature shape memory copolyimides were prepared and the shape memory cycles induced structural evolution of macromolecular chains was investigated in detail. The glass transition temperature (T g ) of poly(benzoxazole-co-imide) (PI1) and poly(benzimidazole-co-imide) (PI2) are 280 8C and 355 8C, respectively. The results show that PI1 could keep stable macromolecular chain structure under shape memory cycles and exhibit outstanding shape memory performance (R f > 98%, R r > 97%) under different stretch condition. Whereas, shape memory cycles induced orientation with more ordered macromolecular chains packing is formed for PI2 after several thermal mechanical cycles,

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Section: Resultsmentioning

confidence: 99%

Shape memory induced structural evolution of high performance copolyimides

Yang

Song

Wang

et al. 2016

J. Polym. Sci. Part A: Polym. Chem.

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“…Such a pattern found for POO-series revealed an ordered intermolecular packing typical of semi-crystalline polyimides indicating that the thermal treatment led to formation of lamellae structure [5,22]. The peaks are better evidenced by the experiments at grazing angle and became more prominent after longer time of thermal treatment (from POO to PI-60).…”

Section: Crystallinitymentioning

confidence: 73%

“…Such carbon-rich derivatives lead to graphite-like structures depending on the temperature and nature of the starting materials [4]. The structural rearrangement may also lead to formation of lamellae [5]. Important contributions concerning the carbonization of PI were made by Bourgerette and Oberlin [6] and Sazanov et al [7].…”

Section: Introductionmentioning

confidence: 99%

Influence of thermal treatment time on structural and physical properties of polyimide films at beginning of carbonization

Ferreira

Battirola

Lewicki

et al. 2016

Polymer Degradation and Stability

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Poly(4,4'-oxydiphenylene-oxydiphthalimide) (POO) was thermally treated at 773 K for 1, 15 and 60 minutes under argon atmosphere resulting in free-standing films with intermingled characteristics between polymer and carbon-rich derivatives. Degradative thermal analysis performed by pyrolysis-gas chromatography/mass spectroscopy (Py-GC/MS) revealed CO 2 among the major products of thermal decomposition which according to electron paramagnetic resonance (EPR) passed through a radical process. X-ray diffraction (XRD) revealed thermal treated samples with semicrystalline organization that was attributed to the development of lamellae structure. Moreover, Atomic force microscopy (AFM) showed an increase in the roughness of the samples that acquired pronounced roughcast-like surface. Hence, there was an enhancement of mechanical strength and dielectric permittivity. From the data collected a mechanism of thermal decomposition was proposed.

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“…The imidization conditions, including imidization temperature and drawing, have a crucial effect on the crystallization behavior of HSHMPI fibers during the two‐step spinning process . It was reported the diffraction steaks in the WAXD patterns became obvious and the degree of molecular orientation improved with increasing imidization temperature, which was ascribed to the formation of ordered structures during imidization process.…”

Section: Structures and Properties Of Hshmpi Fibersmentioning

confidence: 99%

Polyimide Fibers with High Strength and High Modulus: Preparation, Structures, Properties, and Applications

Zhang

Niu

2018

Macromol. Rapid Commun.

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High strength and high modulus polyimide (HSHMPI) fibers are a type of novel high-performance organic fiber with an initial modulus higher than 90 GPa and extremely high tensile strength over 2.5 GPa realizing broad applications in the fields of electronic, engineering, aerospace, and atomic energy industries. There are currently two synthetic pathways, i.e., one-step and two-step methods, developed for the manufacture of HSHMPI fibers. An integrated fabrication process involving wet-spinning followed by thermal imidization is accepted as a typical two-step synthetic route for industrialization of HSHMPI fibers. In this article, the classification, synthetic method and technology, molecular structure, morphology, microstructures, and properties of HSHMPI fibers are summarized extensively. The effects of molecular structure and synthetic technology on the microstructures and overall performance of HSHMPI fibers are discussed. In addition, the trend in development and the application prospect of HSHMPI fibers are analyzed accordingly.

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Strain-induced crystallization of polyimide fibers containing 2-(4-aminophenyl)-5-aminobenzimidazole moiety

Cited by 56 publications

References 47 publications

Shape memory induced structural evolution of high performance copolyimides

Shape memory induced structural evolution of high performance copolyimides

Influence of thermal treatment time on structural and physical properties of polyimide films at beginning of carbonization

Polyimide Fibers with High Strength and High Modulus: Preparation, Structures, Properties, and Applications

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