期刊
POLYMERS
卷 12, 期 10, 页码 -出版社
MDPI
DOI: 10.3390/polym12102376
关键词
impact resistance; bioinspired; helicoidal structure; electrospinning
资金
- La Trobe University Leadership RFA Grant
- Trobe University Start-up Grant
- Collaboration and Research Engagement (CaRE) Grant by the School of Engineering and Mathematical Sciences (SEMS), La Trobe University
- Ministry of Education (MOE) Academic Research Funds Tier 2 titled Materials with Tunable Impact Resistance via Integrated Additive Manufacturing [MOE2017-T2-2-175]
- TEMASEK LAB@SUTD Singapore, through its SEED grant program [IGDS S15 01011]
- SMART (Singapore-MIT Alliance for Research and Technology) through its Ignition grant program [SMART ING-000067 ENG IGN]
In this study, we demonstrate the use of parallel plate far field electrospinning (pp-FFES) based manufacturing system for the fabrication of polyacrylonitrile (PAN) fiber reinforced polyvinyl alcohol (PVA) strong polymer thin films (PVA SPTF). Parallel plate far field electrospinning (also known as the gap electrospinning) is generally used to produce uniaxially aligned fibers between the two parallel collector plates. In the first step, a disc containing PVA/H2O solution/bath (matrix material) was placed in between the two parallel plate collectors. Next, a layer of uniaxially aligned sub-micron PAN fibers (filler material) produced by pp-FFES was directly collected/embedded in the PVA/H2O solution by bringing the fibers in contact with the matrix. Next, the disc containing the matrix solution was rotated at 45 degrees angular offset and then the next layer of the uniaxial fibers was collected/stacked on top of the previous layer with now 45 degrees rotation between the two layers. This process was continued progressively by stacking the layers of uniaxially aligned arrays of fibers at 45 degrees angular offsets, until a periodic pattern was achieved. In total, 13 such layers were laid within the matrix solution to make a helicoidal geometry with three pitches. The results demonstrate that embedding the helicoidal PAN fibers within the PVA enables efficient load transfer during high rate loading such as impact. The fabricated PVA strong polymer thin films with helicoidally arranged PAN fiber reinforcement (PVA SPTF-HA) show specific tensile strength 5 MPa center dot cm(3)center dot g(-1) and can sustain specific impact energy (8 +/- 0.9) mJ center dot cm(3)center dot g(-1), which is superior to that of the pure PVA thin film (PVA TF) and PVA SPTF with randomly oriented PAN fiber reinforcement (PVA SPTF-RO). The novel fabrication methodology enables the further capability to produce even further smaller fibers (sub-micron down to even nanometer scales) and by the virtue of its layer-by-layer processing (in the manner of an additive manufacturing methodology) allowing further modulation of interfacial and inter-fiber adherence with the matrix materials. These parameters allow greater control and tunability of impact performances of the synthetic materials for various applications from army combat wear to sports and biomedical/wearable applications.
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