Microwave promoted rapid curing reaction of phenolic fibers

Liu, Chunling; Ying, Yong-Gang; Feng, Hai-li; Dong, Wen‐Sheng

doi:10.1016/j.polymdegradstab.2007.11.003

Cited by 27 publications

(4 citation statements)

References 20 publications

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“…The peaks at 825 cm −1 and 754 cm −1 are attributed to the characteristic absorption peaks of the para and ortho hydrogen substitutions on the phenolic ring, respectively. 9,14,24 Therefore, the O/P value (substituted ortho and para carbon ratio) can be determined by the relative intensities of the absorptions at 825 cm −1 and 754 cm −1 ( I ortho / I para ) of the phenolic fibers. As presented in Table 1, the O/P ratios of the fibers changed with the curing processes and the content of PMo.…”

Section: Resultsmentioning

confidence: 99%

Structure, stability, and properties of phenolic fibers modified by phenyl molybdate

Yang

Jiao

Zhang

et al. 2020

Polymers and Polymer Composites

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Phenyl molybdate-modified phenolic fibers (PMoPFs) were prepared by melt spinning from the corresponding resin which was polymerized from phenol, formaldehyde, and phenyl molybdate, followed by solution curing and then heat curing processes. The molecular structures, including characteristic groups and molecular weight, were examined by nuclear magnetic resonance, Fourier transform infrared spectroscopy, and gel permeation chromatography. The influences of the curing processes were demonstrated by mechanical properties, scanning electron microscopy, and thermogravimetric analysis characterization. PMoPF with 8 wt% molybdic acid and cured in an oven possessed a tensile strength as high as 187 MPa, initial decomposition temperature of 300°C, and a char yield under nitrogen atmosphere at 800°C as high as 66.0%, with the molybdate (MoO4 2−) groups being introduced into the phenolic main chain.

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Section: Resultsmentioning

confidence: 99%

Structure, stability, and properties of phenolic fibers modified by phenyl molybdate

Yang

Jiao

Zhang

et al. 2020

Polymers and Polymer Composites

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“…The water generated by the reaction volatilized, forming a hole of about 1.6 mm, which increased the thickness of the fiber diameter. 47 The cross-section of the cured fiber did not form a skin-core structure, indicating that C þ H 2 OH diffused uniformly from the surface to the inside. With an increase in temperature, the movement ability of C þ H 2 OH increased, and the curing process gradually became gentle.…”

Section: Preparation and Characterization Of The Phenolic Fibermentioning

confidence: 96%

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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“…The measures of curing and carbonization mentioned above are much the same. Nevertheless, Liu et al presented a microwave-assisted curing method, an energy-efficient heating process, which dramatically reduces the reaction time from 8 hours to 86 minutes [18]. In summary, the curing and carbonizing methods have some limits.…”

Section: Preparation Of Phenolic Fibersmentioning

confidence: 99%

“…Applications. Because of the fact that the PFs contain much crosslinking group, namely, -CHmethylene bridge between two phenolic rings, which results in brittleness of the as-spun PFs and makes it harder to be applied in reality [18]. So far, PFs are often applied in the form after cured and carbonized (Fig.…”

Section: Preparation Of Phenolic Fibersmentioning

confidence: 99%

Progress in Preparation of Phenolic Fibers by Electrospinning

Xie

Liu

et al. 2015

MSF

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Phenolic fiber is a versatile material. This article focused on introduction of the progress of generating phenolic fibers using solution electrospinning method and its applications, as well as the trail exploration of preparing phenolic fibers by melt electrospinning. For the research on preparation of phenolic fibers using solution electrospinning, researchers added polymers or additive agents to adjust the viscosity and electrical conductivity of the spinning solution. Then they cured and carbonized the electrospun fibers to reach their varied aims. After these two processes, the brittle nature of the phenolic fibers has been greatly changed. What’s more, the modification makes it easier to be dealed with in the analysis tests and be more suitable to be applied as adsorbent materials, nonconductive materials, and flexible materials.

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Microwave promoted rapid curing reaction of phenolic fibers

Cited by 27 publications

References 20 publications

Structure, stability, and properties of phenolic fibers modified by phenyl molybdate

Structure, stability, and properties of phenolic fibers modified by phenyl molybdate

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

Progress in Preparation of Phenolic Fibers by Electrospinning

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