Pre-drawing induced evolution of phase, microstructure and property in para-aramid fibres containing benzimidazole moiety

Luo, Longbo; Wang, Yazhe; Huang, Jieyang; Hong, Dawei; Wang, Xu

doi:10.1039/c6ra10184d

Cited by 24 publications

(18 citation statements)

References 53 publications

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“…So the segmental motion ability of PVA molecules increases, resulting in the glass transition temperature of the Fe(III)‐PVA PFs decrease. When the content of nano‐SiO 2 was > 2.0 wt %, the magnitude in tanδ is less than the control sample, which indicates that the segment motion of PVA was suppressed …”

Section: Resultsmentioning

confidence: 89%

Effect of nano silicon dioxide on the structure and properties of FeCl₃‐doped polyvinyl alcohol photopolymer film

Xue

Mao

Zhang

et al. 2019

J of Applied Polymer Sci

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The polyvinyl alcohol (PVA) photopolymer films (PFs) were prepared based on iron(III) trichloride as the photosensitizer and PVA as the polymer matrix (Fe(III)-PVA). The nano silicon dioxide (nano-SiO 2 ) was mixed with the resin in proportions of 0.5, 1.0, 2.0, and 5.0 wt %, respectively. The iodine gallium lamp (350-450 nm) was used as a UV curing light source. The effects of nano-SiO 2 on the structures and properties of Fe(III)-PVA PFs were studied by scanning electron microscopy(SEM) analysis, ultraviolet-visible absorption spectroscopy (UV/Vis), X-ray diffraction (XRD), dynamic thermomechanical analysis(DMA), gel content test, tensile strength test, and Shore hardness test. The Fe(III)-PVA PFs with the content of 1.0 wt %-nano-SiO 2 exhibits the highest gel content and tensile strength. The Fe(III)-PVA PFs with the content of 2.0 wt % nano-SiO 2 exhibits the highest Shore hardness. Photolithographic patterning of the Fe(III)-PVA PFs using a UV source has been carried out, which leads to a good contrast behavior after development in an aqueous media when the content of nano-SiO 2 was lower than 2.0 wt %. After evaluating the structure, performance, and development results, the Fe(III)-PVA PFs with the content of 1.0 wt % nano-SiO 2 exhibits the best overall properties.

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Section: Resultsmentioning

confidence: 89%

Effect of nano silicon dioxide on the structure and properties of FeCl₃‐doped polyvinyl alcohol photopolymer film

Xue

Mao

Zhang

et al. 2019

J of Applied Polymer Sci

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“…PABI was synthesized by mixing equiequivalent PABZ and TPC in DMAc/LiCl and stirred for 3 h in a dry nitrogen atmosphere. The detailed procedure can be found in previous work …”

Section: Methodsmentioning

confidence: 99%

Synthesis of Heterocyclic Aramid Fiber Based on Solid‐Phase Cross‐Linking of Oligomers with Reactive End Group

Dai

Han

Yao

et al. 2018

Macro Materials & Eng

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Low compressive strength of aramid fiber is one of the major obstacles for its application in advanced composite materials. In this study, poly‐(benzimidazole‐terephthalamide) (PABI) fibers are fabricated by solid‐phase cross‐linking of corresponding oligomers end‐capped with norbornene anhydride (NA). Concentration of the spinning solution increases and apparent viscosity is reduced significantly through this method, which improves its processability. Reactivity and thermal stability of the NA group are measured by in situ Fourier transform infrared (FTIR) and thermogravimetric analysis and it shows high reactivity at 360 °C and adequate thermal stability under 400 °C. Results of solubility test and dynamic mechanical analysis indicate cross‐linking degree increases with decrease of molecular weight of the corresponding oligomer. Results of both 2D wide angle X‐ray diffraction and polarized FTIR illustrate orientation will be affected by cross‐linking and it decreases with the increase of cross‐linking degree. PABI fibers fabricated through this method can maintain outstanding mechanical properties and compressive strength is improved by 67% at most. Interestingly, interfacial shear strength of PABI fibers is improved by nearly 20% and damage between skin–core layers after debonding of fiber and resin is not observed.

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“…In order to dissolve aramid, it is generally necessary to add chloride salts such as CaCl 2 or LiCl in NMP or DMAc . Due to the difference in electronegativity, Ca 2+ or Li + ions can coordinate with oxygen atoms on carbonyl bonds of NMP or DMAc and form cationic complex, followed by releasing Cl − ions . When protons of secondary amide bonds of aramid are present, Cl − ions will form hydrogen‐bond with them and break intermolecular hydrogen‐bond interaction of aramid simultaneously …”

Section: Methodsmentioning

confidence: 99%

“…In general, conductivity of solution is related to concentration of free ions which can move in external electric field . Since IDC is confirmed to form in the solution, improvement of conductivity may be attributed to it.…”

Section: Methodsmentioning

confidence: 99%

In Situ Complex with by‐product HCl and Release Chloride Ions to Dissolve Aramid

et al. 2018

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Because of the strong hydrogen-bond interaction among macromolecular chains, the addition of chloride salts is generally needed to offer Cl ions for the dissolution of aromatic polyamides. In this paper, poly-(benzimidazole-terephthalamide) which complexed with by-product HCl during polymerization (PABI-HCl) was prepared and imidazole compound as cosolvent was added into dimethylacetamide (DMAc) to dissolve PABI-HCl. Due to stronger affinity to protons, imidazole compound could in-situ complex with HCl of PABI-HCl and form imidazolium hydrochloride. Then imidazolium hydrochloride would ionize and produce much free Cl ions which acted as stronger hydrogen-bond acceptor to disrupt interaction among macromolecular chains. As a result, solubility of PABI-HCl in DMAc was improved significantly in existence of small amount of imidazole compound. Moreover, DMAc-imidazole mixture was utlized for synthesis of different kinds of aramids and no precipitation was observed with progress of the reaction. So the mixture was suitable to be utlized as solvent for polymerization of aramid.

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Pre-drawing induced evolution of phase, microstructure and property in para-aramid fibres containing benzimidazole moiety

Abstract: Copoly(p-phenylene-benzimidazole-terephthalamide) (PBIA) fibre was spun by wet-spinning and drawn in a coagulating bath with different pre-drawing ratios (R).

Cited by 24 publications

References 53 publications

Effect of nano silicon dioxide on the structure and properties of FeCl₃‐doped polyvinyl alcohol photopolymer film

Effect of nano silicon dioxide on the structure and properties of FeCl₃‐doped polyvinyl alcohol photopolymer film

Synthesis of Heterocyclic Aramid Fiber Based on Solid‐Phase Cross‐Linking of Oligomers with Reactive End Group

In Situ Complex with by‐product HCl and Release Chloride Ions to Dissolve Aramid

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Pre-drawing induced evolution of phase, microstructure and property in para-aramid fibres containing benzimidazole moiety

Abstract: Copoly(p-phenylene-benzimidazole-terephthalamide) (PBIA) fibre was spun by wet-spinning and drawn in a coagulating bath with different pre-drawing ratios (R).

Cited by 24 publications

References 53 publications

Effect of nano silicon dioxide on the structure and properties of FeCl3‐doped polyvinyl alcohol photopolymer film

Effect of nano silicon dioxide on the structure and properties of FeCl3‐doped polyvinyl alcohol photopolymer film

Synthesis of Heterocyclic Aramid Fiber Based on Solid‐Phase Cross‐Linking of Oligomers with Reactive End Group

In Situ Complex with by‐product HCl and Release Chloride Ions to Dissolve Aramid

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Effect of nano silicon dioxide on the structure and properties of FeCl₃‐doped polyvinyl alcohol photopolymer film

Effect of nano silicon dioxide on the structure and properties of FeCl₃‐doped polyvinyl alcohol photopolymer film