Influence of epichlorohydrin content on structure and properties of high‐ortho phenolic epoxy fibers

Jiao, Mingli; Yang, Kai; Cao, Jian; Diao, Quan; Zhang, Wangxi; Yu, Miao

doi:10.1002/app.43375

Cited by 19 publications

(2 citation statements)

References 18 publications

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“…Phenolic fiber displays a relatively high limiting oxygen index (34–36%) and excellent flame retardant performance, maintaining the original molecular chain structure after high-temperature combustion. Fabric consisting of phenolic fiber has unique advantages in high-temperature protection, aerospace equipment protection, and other fields [ 14 , 15 , 16 , 17 , 18 , 19 , 20 ]. Meanwhile, phenolic fiber is also a precursor in the preparation of activated carbon fiber and carbon fiber/phenolic resin composites, which have been widely used in adsorption and energy storage materials, and in electrochemical fields [ 20 , 21 ].…”

Section: Introductionmentioning

confidence: 99%

Preparation of Lignin-Based High-Ortho Thermoplastic Phenolic Resins and Fibers

Ren

Xie

et al. 2021

Molecules

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Surplus lignin, which is inefficiently used, is generated in the forestry industry. Currently, most studies use lignin instead of phenol to synthesize thermosetting resins which cannot be reprocessed, thus affecting its application field. Thermoplastic phenolic resin has an orderly structure and excellent molding performance, which can greatly improve its application field and economic value. Herein, phenol was partially replaced with enzymolysis lignin (without treatment), generating lignin-based high-ortho thermoplastic phenolic resins (LPRs), and then lignin-based phenolic fibers (LPFs) were prepared by melt spinning. FTIR, 13C-NMR and GPC were used to characterize the ortho–para position ratio (O/P value), molecular weight and its distribution (PDI), and rheological properties of the resin. TG, XRD, SEM and tensile property studies were used to determine the thermal stability, orientation, and surface morphology of the fiber. Lignin addition resulted in the decline of the O/P value and molecular weight of the resin. For the 10% LPR, the O/P value, Mw, and PDI were 1.28, 4263, and 2.74, respectively, with the fiber exhibiting relatively good spinnability. The tensile strength and elongation at break of the 10% LPF were 160.9 MPa and 1.9%, respectively. The addition of lignin effectively improved the thermal properties of the fiber, and the carbon yields of 20% LPF before and after curing were 39.7% and 53.6%, respectively, which were 22.2% and 13.7% higher than that of the unmodified fiber, respectively.

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Section: Introductionmentioning

confidence: 99%

Preparation of Lignin-Based High-Ortho Thermoplastic Phenolic Resins and Fibers

Ren

Xie

et al. 2021

Molecules

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“…Phenolic fiber has excellent flame retardancy properties and has been widely used in textiles and composite materials required for special working conditions such as fireproof and corrosion resistance. [1][2][3][4] Some other properties of the phenolic fiber are its high carbon yield, large specific surface area, and its fiber-shape retention after carbonization. It can be used as the precursor of carbon fiber and activated carbon fiber to prepare carbon fiber/phenolic resin composites and energy storage materials, which can be used in batteries, supercapacitors, microelectronic devices and other technical fields.…”

Section: Introductionmentioning

confidence: 99%

Improving the thermal and mechanical properties of phenolic fiber over boron modified high-ortho phenolic resin

Ren

Lin

Shi

et al. 2020

High Performance Polymers

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Boron-modified high-ortho phenolic resins (BPRs) were prepared under normal pressure by using phenol and formaldehyde as raw materials, zinc acetate, and oxalic acid as catalysts, and boric acid as a modifier. Boron-modified phenolic fibers (BPFs) were prepared by melt spinning and curing in a mixture of formaldehyde and hydrochloric acid, followed by a heat treatment under high temperature. The structure, ortho–para ratio (O/P), molecular weight and distribution, spinnability, thermal stability, fiber strength, and morphology of the resins were characterized by Fourier transform infrared (FTIR) spectroscopy, nuclear magnetic resonance (NMR), gel permeation chromatography (GPC), thermogravimetric analysis (TGA), scanning electron microscopy (SEM), and fiber strength testing. The results showed that the addition of boric acid reduced the ortho reaction of the synthetic resin and the O/P value of phenolic resin. When the content of boric acid was 3 wt%, the thermal stability was the best, the O/P value was up to 3.26, and the weight average molecular weight (Mw) was 18745 g/mol. In Compared with the unmodified resin, the mass loss was increased by 33.7%, and finally the carbon yield was 51.2%. The tensile strength of the fibers reached 187.2 MPa and the elongation at break was 10.5%. By introducing boron into the molecular chain, the structure of the resin was improved, and the thermal stability and mechanical properties of the fibers were improved.

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Preparation and Properties of Molybdenum‐modified High‐ortho Thermosetting Phenolic Fiber

Gu,

Yang,

Liu

et al. 2024

ChemistrySelect

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The study aims to produce thermosetting resin from synthesized molybdenum‐modified high‐ortho thermoplastic phenolic resin through an addition reaction. Then, molybdenum‐modified high‐ortho thermosetting phenolic resin is blended with polyvinyl butyral and undergoes wet spinning to prepare as‐spun fibers and obtain high‐ortho molybdenum phenolic fibers via solution curing, microwave curing, or heat curing. Fourier transform infrared spectroscopy, nuclear magnetic resonance, thermogravimetric analysis, scanning electron microscopy, and fiber strength testing were used to investigate the structure and properties of molybdenum‐modified high‐ortho phenolic fibers. Results showed that adding molybdic acid introduced Mo−O bonds into the molecular chain of high‐ortho phenolic resin, thereby improving the degree of cross‐linking and thermal stability. The residual carbon content of the fibers after heat treatment exceeded 60%, and the elongation at break and the breaking strength of the microwave‐cured fibers reached 4.2% and 155 MPa, respectively, and the mechanical properties were relatively good. The study of high‐ortho phenolic fibers aims to improve their properties and expand their applications through resin modifications. It provides a possible fiber preparation strategy for improving heat‐resistant phenolic fibers, thereby guiding the research of modified high‐ortho phenolic fibers.

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Influence of epichlorohydrin content on structure and properties of high‐ortho phenolic epoxy fibers

Cited by 19 publications

References 18 publications

Preparation of Lignin-Based High-Ortho Thermoplastic Phenolic Resins and Fibers

Preparation of Lignin-Based High-Ortho Thermoplastic Phenolic Resins and Fibers

Improving the thermal and mechanical properties of phenolic fiber over boron modified high-ortho phenolic resin

Preparation and Properties of Molybdenum‐modified High‐ortho Thermosetting Phenolic Fiber

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