Preparation and properties of high-performance polyimide copolymer fibers containing rigid pyrimidine and benzoxazole moieties with hydrogen bonding

Bao, Feng; Zhou, Dong; Zhang, Ran; Qi, Fuling; Dai, Xuemin; Qiu, Xuepeng

doi:10.1016/j.jmrt.2021.03.056

Cited by 11 publications

(10 citation statements)

References 53 publications

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“…Taking the BPHB–0 fiber as a reference, the tensile strength of BPHB fibers first increases and then decreases after the addition of HAB, while their modulus gradually decreases from 106.60 GPa of BPHB–1 fiber to 72.61 GPa of BPHB–7 fiber. Particularly, the BPHB–3 fiber possesses the outstanding strength and modulus of 2.62 GPa and 100.15 GPa, respectively, which proves that the high-strength and high-modulus PI fibers with hydroxyl groups had been successfully manufactured in the current work depending on the evaluation standard of the organic fiber [ 24 ].…”

Section: Resultsmentioning

confidence: 91%

“…The tensile strength and modulus of PI fibers increased significantly from the initial 1.2 GPa and 64.6 GPa to 2.8 GPa and 115.2 GPa, respectively. Bao et al [ 24 ] introduced an HBOA diamine containing an -OH group into the BPDA/PRM macromolecular chain; meanwhile, the tensile strength and modulus of resultant fibers surprisingly reached 4.15 GPa and 125.93 GPa, respectively. To meet the requirements of wave-transparent composite reinforcement, Wang et al [ 25 ] selected the TFMB diamine-containing -CF 3 group and then introduced it into the BPDA/ p -PDA/BIA polymer chain.…”

Section: Introductionmentioning

confidence: 99%

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Preparation and Interfacial Properties of Hydroxyl-Containing Polyimide Fibers

Sun

et al. 2023

Polymers

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Developing polyimide (PI) fibers with excellent interfacial adhesion and high mechanical properties for the PI fiber-reinforced polymer matrix composites (PFRPs) industry has been challenging. In this work, 4,4′-diamino-(1,1′-biphenyl)-3,3′-diol (HAB) diamine was introduced into the rigid molecular chains, and the high-performance PI fibers, presenting an interfacial shear strength (IFSS) value of 46.33 MPa, tensile strength of 2.62 GPa, and modulus of 100.15 GPa, were successfully manufactured when the content of HAB in mixed diamines was 30 mol %. Fourier transform infrared (FTIR) spectroscopy identified the presence of intermolecular H-bonding interactions, and 2D small-angle X-ray scattering indicated that the introduction of HAB moiety contributed to reducing the radii of microvoids in the fibers, which were considered to be the key factors leading to a significant enhancement in the mechanical properties of the fibers. X-ray photoelectron spectroscopy (XPS) and the static contact angle intuitively illustrated that the synthetic fiber surface contained active hydroxyl groups. The IFSS value of PI fiber/epoxy resin composites (PI/EPs) was 56.47 MPa when the content of HAB reached 70 mol %. Failure morphologies confirmed that the interfacial adhesion of PI/EPs was enhanced owing to the surface activity of PI fibers. Consequently, this study provides an effective strategy to the long-standing problems of high mechanical performances and poor surface activity for traditional PI fibers used in the PFRPs industry.

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Section: Resultsmentioning

confidence: 91%

Section: Introductionmentioning

confidence: 99%

Preparation and Interfacial Properties of Hydroxyl-Containing Polyimide Fibers

Sun

et al. 2023

Polymers

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“…With the increase of rigid PRZ content (0 → 70 mol %, even 100 mol %), the whole polymer chains become more rigid, resulting in the increased trend of T g values. However, the copolymerization method can also lead to the decrease of T g values due to the decrease in regularity of polymer chains. , Therefore, the overall trend of T g values is to first decline and then increase, which is also the reason for the lowest T g value of PI film containing 30 mol % PRZ content. Furthermore, all obtained PI films show outstanding thermal degradation stabilities even at 550 °C (Figure b).…”

Section: Resultsmentioning

confidence: 99%

Near-Zero Thermal Expansion and High Heat-Resistance Polyimide Films Based on a Symmetric and Rigid Pyrazine Structure

Bao

Lei

et al. 2022

ACS Appl. Polym. Mater.

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Regarding the applications of polyimide (PI) films in emerging flexible devices and precision apparatus, their low coefficient of thermal expansion (CTE), especially near-zero expansion, is an urgent requirement for weakening the internal stress between the organic/ inorganic layers. Other properties of PI films including the high heatresistance and superior toughness are also demanded in actual scenarios. Herein, a set of PI films was developed by copolymerization of 2,5-bis(4aminophenyl)pyrazine (PRZ) into a pyromellitic dianhydride (PMDA)/ 4,4′-oxydianiline (ODA) system. The monocrystal analysis of the PRZ monomer reveals its rigid, symmetric, and nearly coplanar steric structure. Thanks to the synergy and balance of flexible ODA and rigid PRZ units in PI chains, the near-zero expansion, high heat-resistance, and optimal mechanical properties of the PI films are simultaneously achieved. Particularly, the PI film with ODA/PRZ = 4.5/5.5 presents a near-zero CTE of −0.41 ppm/K, high glass transition temperature (T g ) of around 417 °C, superior fracture strength of 191 MPa, and initial modulus of 3.83 GPa. Interestingly, via adjusting the ODA/PRZ ratios, the precise control of CTE values can be realized, enabling the thermal expansion matching of PI films on broad types of device substrates, e.g., Cu (15−17 ppm/K) and Si (3−5 ppm/K).

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“…4–8 It is a representative high-performance polymer material among the most promising candidates for use as gas separation membranes due to its unique physicochemical properties, including excellent thermal stability, outstanding mechanical properties, relatively low cost, and corrosion resistance. 9–14…”

Section: Introductionmentioning

confidence: 99%

“…[4][5][6][7][8] It is a representative high-performance polymer material among the most promising candidates for use as gas separation membranes due to its unique physicochemical properties, including excellent thermal stability, outstanding mechanical properties, relatively low cost, and corrosion resistance. [9][10][11][12][13][14] However, the applicability of PIs is frequently limited by their infusible, insoluble and dark color nature. 1,15 Meanwhile, a mutual restriction cannot be considered, i.e., increasing the permeability coefficient of a given gas reduces the selectivity for this gas and vice versa.…”

Section: Introductionmentioning

confidence: 99%