Conversion of Recycled Polymers/Fibers Into Melt-Blown Nonwovens

Bhat, Gajanan; Narayanan, Vasanth; Wadsworth, Larry C.; Dever, M.

doi:10.1080/03602559909351596

Cited by 6 publications

(3 citation statements)

References 3 publications

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“…Such products can easily be collected and have exhibited good potential for recycling or upcycling. Some researchers have converted them into melt‐blown nonwoven fibers and monomers by pyrolysis, composite formation, and upcycling into graphene flakes. An appreciable amount of untreated polypropylene waste (PPw) is either incinerated or dumped in landfills; this poses severe negative threats to the global environment .…”

Section: Introductionmentioning

confidence: 99%

Surface modification of polypropylene waste by the radiation grafting of styrene and upcycling into a cation‐exchange resin

Hassan

Taimur

Khan

et al. 2018

J of Applied Polymer Sci

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In this study, we radiation‐grafted polypropylene waste (PPw) powder obtained from the accelerated aging of pristine polypropylene with styrene (St) using γ rays from a Co‐60 source at dose rate of 4.78 kGy/h. The influence of the variation of the γ absorbed dose, solvent types, and monomer concentration on the grafting yield was investigated. Solution grafting in methanol resulted in a higher grafting yield of 162.6% at 30 kGy in contrast to the 69.5% obtained in the absence of solvent. Grafting was found to be enhanced with the increased dilution of St with methanol. The grafted St units were incorporated with sulfonic (SO3H) groups by a sulfonation reaction with sulfuric acid. Fourier transform infrared spectroscopy, X‐ray diffraction spectrometry, scanning electron microscopy/energy‐dispersive X‐ray spectroscopy, and thermogravimetric analysis were used to characterize the grafted and sulfonated products. Sulfonation of 162.6% grafted PPw powder exhibited a maximum ion‐exchange capacity (IEC) of 3.56 mequiv/g. The utilization of PPw and its conversion into sulfonated PPw with comparable IECs is a new addition to already existing radiation grafting systems. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 47145.

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Section: Introductionmentioning

confidence: 99%

Surface modification of polypropylene waste by the radiation grafting of styrene and upcycling into a cation‐exchange resin

Hassan

Taimur

Khan

et al. 2018

J of Applied Polymer Sci

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“…Blending leads to reduce cost, while the properties of new blended fibers can still achieve outstanding performance. Bhat et al [ 63 ] blended recycled and virgin polypropylene (PP) into fibers with micrometer diameters using melt-blown technology. They found that there is no need to blend more than 10–25% of recycled PP to maintain the properties of virgin PP.…”

Section: Traditional Fiber Spinningmentioning

confidence: 99%

Circulatory Management of Polymer Waste: Recycling into Fine Fibers and Their Applications

et al. 2021

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In modern society, it is impossible to imagine life without polymeric materials. However, managing the waste composed of these materials is one of the most significant environmental issues confronting us in the present day. Recycling polymeric waste is the most important action currently available to reduce environmental impacts worldwide and is one of the most dynamic areas in industry today. Utilizing this waste could not only benefit the environment but also promote sustainable development and circular economy management. In its program statement, the European Union has committed to support the use of sorted polymeric waste. This study reviews recent attempts to recycle this waste and convert it by alternative technologies into fine, nano-, and microscale fibers using electrospinning, blowing, melt, or centrifugal spinning. This review provides information regarding applying reprocessed fine fibers in various areas and a concrete approach to mitigate the threat of pollution caused by polymeric materials.

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“…The purpose of chapter 5 is to further the value of blue wrap rPP by conversion of its secondary raw material for 3D printing applications. An MFI of 118 g/10mins was measured for pelletised recycled SMS fabric by Bhat et al, which suggests modification of the formulation will be necessary to reduce MFI for FFF printing [76]. Such a filament would provide a circular, short lead time supply solution for hospitals and other institutions currently relying on imports of unique products produced via conventional manufacturing.…”

Section: End-of-life Strategies For Plasticsmentioning

confidence: 99%

Additive Manufacturing with Polymer Composites for Sustainable Applications

Cummings

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The evolving field of digital manufacturing includes additive manufacturing (AM) that builds computationally sliced parts layer-by-layer. AM popularity continues to grow partially due to its potential to accelerate the transition to a circular economy. This thesis aims to help mitigate waste products using four novel polymer composites designed and developed for use with either fused filament fabrication (FFF) or direct writing (DW). These polymer composites are: 1) Simulation verified and AM printed triply periodic minimal surface lattice structures embedded with heat storage materials. Diamond TPMS geometry bentonite/CaCl2 embedded prints of low packed configuration adsorb <19.1% total dry cylinder weight and reaches 38.3 °C bulk temperature when stacked in an open reactor. 2) Microporous zeolite composites for carbon capture strengthened using novel sacrificial polymer content. Zeolite 13X composite UCS increases from 4.92 (±1.22) to 7.75 (±0.75) MPa with the addition of 4 wt% CSR providing a composite BET surface area of 148 (±17)cm3/g. 3) Printer filaments made from rPP hospital blue wrap previously destined for landfill or incineration. MFI is reduced from 103 (±8) to 45 (±2)g/10mins when increasing SEBS content from 9.1 wt% to 20 wt%. The reduced MFI facilitates filament extrusion and subsequent printing of tensile and impact samples with tensile strength and impact energy absorption up to 22.5 (±1.2) MPa and 14 (±0.8) kJ/m2, respectively. 4) Epoxy matrix composites for;i) weight saving applications and ii) bone-like composite manufacture to improve surgical training and patient communication. Drilled compression strength of bone-like epoxy matrix composites encompassed those of drilled bone compression strength, ranging between a 5 wt% gypsum and 20 wt%hydroxyapatite composite of 2.7 (±0.3) MPa to a 1 wt% PE, 40 wt% GY and 5wt% HA composite of 6.5 (±0.5) MPa. This thesis contributes a furthered understanding of low-cost desktop AM as utilised for local acquisition of custom engineering products that necessitates minimal lead times and transportation.

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Conversion of Recycled Polymers/Fibers Into Melt-Blown Nonwovens

Cited by 6 publications

References 3 publications

Surface modification of polypropylene waste by the radiation grafting of styrene and upcycling into a cation‐exchange resin

Surface modification of polypropylene waste by the radiation grafting of styrene and upcycling into a cation‐exchange resin

Circulatory Management of Polymer Waste: Recycling into Fine Fibers and Their Applications

Additive Manufacturing with Polymer Composites for Sustainable Applications

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