Preparation and properties of partially dry-processed poly (m-phenylene isophthalamide) films

Son, Tae-Won; Kim, Jong-Hwan; Lee, Woo-seung; Park, Jae-hoon; Kang, Young-Sic

doi:10.1007/s12221-013-0653-y

Cited by 4 publications

(3 citation statements)

References 15 publications

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“…In these cases, the development of crystallinity is influenced by both the fast electrospinning process and the presence of NBR. The resulting peak at about 17.5° is indeed found in Nomex films, instead of Nomex fibers, where the strong orientation due to the fiber forming process is lacking and macromolecules may arrange in a different crystal lattice …”

Section: Results and Discussionmentioning

confidence: 92%

“…The resulting peak at about 17.5° is indeed found in Nomex films, instead of Nomex fibers, where the strong orientation due to the fiber forming process is lacking and macromolecules may arrange in a different crystal lattice. 43 …”

Section: Results and Discussionmentioning

confidence: 99%

“…41,42 Mixed nanofibers, instead, where the strong orientation due to the fiber forming process is lacking and macromolecules may arrange in a different crystal lattice. 43 3.2. Tensile Test of Nanofibrous Mats.…”

Section: Resultsmentioning

confidence: 99%

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Self-Assembled NBR/Nomex Nanofibers as Lightweight Rubbery Nonwovens for Hindering Delamination in Epoxy CFRPs

Maccaferri

Mazzocchetti

Benelli

et al. 2021

ACS Appl. Mater. Interfaces

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Still today, concerns regarding delamination limit the widespread use of high-performance composite laminates, such as carbon fiber-reinforced polymers (CFRPs), to replace metals. Nanofibrous mat interleaving is a well-established approach to reduce delamination. However, nanomodifications may strongly affect other laminate thermomechanical properties, especially if achieved by integrating soft materials. Here, this limitation is entirely avoided by using rubbery nitrile butadiene rubber (NBR)/Nomex mixed nanofibers: neither laminate stiffness nor glass-transition temperature ( T g ) lowering occurs upon CFRP nanomodification. Stable noncrosslinked nanofibers with up to 60% wt of NBR were produced via single-needle electrospinning, which were then morphologically, thermally, spectroscopically, and mechanically characterized. NBR and Nomex disposition in the nanofiber was investigated via selective removal of the sole rubber fraction, revealing the formation of particular self-assembled structures resembling quasi-core–shell nanofibers or fibril-like hierarchical structures, depending on the applied electrospinning conditions (1.10 and 0.20 mL/h, respectively). Mode I and Mode II loading tests show a significant improvement of the interlaminar fracture toughness of rubbery nanofiber-modified CFRPs, especially G I (up to +180%), while G II enhancement is less pronounced but still significant (+40% in the best case). The two nanofibrous morphologies (quasi-core–shell and fibril-like ones) improve the delamination resistance differently, also suggesting that the way the rubber is located in the nanofibers plays a role in the toughening action. The quasi-core–shell nanofiber morphology provides the best reinforcing action, besides the highest productivity. By contrast, pure Nomex nanofibers dramatically worsen the interlaminar fracture toughness (up to −70% in G I ), acting as a release film. The achieved delamination resistance improvements, combined with the retention of both the original laminate stiffness and T g , pave the way to the extensive and reliable application of NBR/Nomex rubbery nanofibrous mats in composite laminates.

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Section: Results and Discussionmentioning

confidence: 92%

Section: Results and Discussionmentioning

confidence: 99%