Poly(P‐Phenylene Terephthalamide) Fibers Reinforced with Ultrathin Ceramic Coatings

Zhang, Zhuolei; Lee, Namhoon; Patel, Ketan; Young, Mitchell; Zhang, Jingming; Percec, Simona; Ren, Shenqiang

doi:10.1002/adem.201800095

Cited by 15 publications

(11 citation statements)

References 25 publications

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“…High‐performance fibers, such as aramid, PBO and M5, have been widely applied in aerospace, protective materials and advanced electronic devices . However, axial compressive strength of the fibers is generally low, which leads to macrostructure failure when they receive compressive stress ,. This limits its application as reinforcing material in advanced composites.…”

Section: Figurementioning

confidence: 99%

Synthesis of A Novel Cross‐linker with High Reactivity for Enhancing Compressive Strength of High‐performance Organic Fibers

et al. 2019

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Low axial compressive strength of high-performance organic fibers is one of the most prominent problems for their application in advanced technologies. In this paper, N, N'diphenyl-1,4-phenylacetyleneamide (DPAA) as a novel external cross-linker was synthesized. It was confirmed that DPAA could react itself and quickly form cross-linking network above 210°C with pore width of 1-30 nm. Then DPAA was introduced into some typical high-performance organic fibers through postswelling process, followed by annealing at 250°C. It was found that DPAA would in-situ form cross-linking network inside the fiber, which was regarded as semi-interpenetration structure. Compressive strength of Kevlar-49 fiber modified through this method increased by nearly 70% and corresponding tensile strength didn't deteriorate. When PBO, heterocyclic aramid and polyimide fibers were modified by the same procedure, their compressive strength showed 25, 36 and 72% enhancement respectively. Therefore, DPAA is an effective modifier to enhance compressive strength of high-performance organic fibers and shows great universality. 2 3 4 5 6 7 8

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Section: Figurementioning

confidence: 99%

Synthesis of A Novel Cross‐linker with High Reactivity for Enhancing Compressive Strength of High‐performance Organic Fibers

et al. 2019

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“…However, to date, most studies focus on the mechanical properties of single fibers along their longitudinal direction 13–18 . Compared to the covalent bonds and extra inter-chain bonds along the longitudinal direction 4,13–15 , the hydrogen bonds and aromatic stacking interactions in the transverse direction are much weaker. Consequently, the poor mechanical properties along the transverse direction would potentially deteriorate their protective performance due to material damage and failure 16–19 .…”

Section: Introductionmentioning

confidence: 98%

“…In additon to mechanical properties, the chemical robustness of fibers is also an important scenario to be considered since the body armors may be exposed to harsh environmental conditions. Under some specific external chemical attacks (e.g., acidic or alkaline conditions), significant deterioration of the fibers due to bond breaking could result in a weakening of their mechanical strength 4,13 . Therefore, improvement of mechanical properties in the transverse direction and chemical stability of PPTA fibers are highly desired for their protective applications.…”

Section: Introductionmentioning

confidence: 99%

Nanoparticle-Infused UHMWPE Layer as Multifunctional Coating for High-Performance PPTA Single Fibers

Zhang

Zhao

et al. 2019

Sci Rep

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High-performance fibers made of poly-( p -phenylene terephthalamide) (PPTA) with high stiffness and high strength are widely used in body armor for protection due to their high degree of molecular chain alignment along the fiber direction. However, their poor mechanical properties in the transverse direction and low surface friction are undesirable for applications requiring resistance to ballistic impact. Here we provide a simple yet effective surface engineering strategy to improve both the transverse mechanical properties and the tribological property by coating PPTA fibers with ultra-high molecular weight polyethylene (UHMWPE) embedded with silica nanoparticles. The coated-PPTA fiber shows remarkable enhancement in transverse mechanical properties including ~127% increase of Young’s modulus, which is attributed to both the alignment of UHMWPE chains in the transverse direction and the embeded ceramic nanoparticles. Meanwhile, the surface friction of the coated fiber increases twofold as a result of the ceramic nanoparticles. In addition, the coated fibers exhibit an enhanced chemical resistance to external harsh environment. The improved transverse mechanical properties, surface frictional characteristics, and chemical resistance demonstrate that coating with UHMWPE and ceramic nanoparticles can be used as an effective approach to enhance the performance of PPTA and other high-performance polymer fibers for body armor applications.

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“…All these methods can only enhance IFSS but do not have positive effect on compressive properties. Low compressive strength of aramid derives from weak interaction among polymer chains . Introduction of chemical crosslinking, which can enhance lateral interaction, is effective for improving compressive strength .…”

Section: Introductionmentioning

confidence: 99%

Improving Interfacial and Compressive Properties of Aramid by Synchronously Grafting and Crosslinking

Dai

Feng

Meng

et al. 2019

Macro Materials & Eng

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Improving compressive strength of aramid and its adhesion to resin is of great significance for its application in reinforcing materials. In this study, a novel method for improving interfacial and compressive properties of aramid fiber is presented. α,α′‐Dichloro‐p‐xylene (DCX) is utilized as an external crosslinker to modify aramid fiber containing benzimidazole units during the post swelling process. Chloromethyl groups from DCX can react with benzimidazole moieties of the aramid fiber. The reaction can be regarded as crosslinking inside the fiber and grafting on the surface. By controlling the swelling effect of the solvent during modification, bulk crosslinking degree and surface grafting density can be adjusted. Therefore, intermolecular interaction and surface polarity of the aramid fiber can be improved simultaneously. After modification, the compressive strength of the fiber can be enhanced by nearly 100% and interfacial shear strength increases by 37%, while excellent mechanical properties are maintained. Therefore, comprehensive performance of aramid fiber can be improved significantly by synchronously crosslinking and grafting.

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Poly(P‐Phenylene Terephthalamide) Fibers Reinforced with Ultrathin Ceramic Coatings

Cited by 15 publications

References 25 publications

Synthesis of A Novel Cross‐linker with High Reactivity for Enhancing Compressive Strength of High‐performance Organic Fibers

Synthesis of A Novel Cross‐linker with High Reactivity for Enhancing Compressive Strength of High‐performance Organic Fibers

Nanoparticle-Infused UHMWPE Layer as Multifunctional Coating for High-Performance PPTA Single Fibers

Improving Interfacial and Compressive Properties of Aramid by Synchronously Grafting and Crosslinking

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