Bade, Raja

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Bade, Raja
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Bade, Raja
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    Item type:Publication,
      41
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    Towards coupling agent-free composites made from regenerated cellulose/HDPE by UV radiation-induced cross-linking
    (Taylor & Francis, 2025-01)
    Bade, Raja
    ;
    Gebert, Beate
    ;
    Tsarkova, Larisa
    ;
    Bahners, Thomas
    ;
    Gutmann, Jochen
    This research aims to enhance fibre-matrix adhesion in bio-based fibre-reinforced polyolefins without using adhesion promoters. The primary focus is to establish a cross-linking mechanism between cellulose fibres and polyethylene by applying UV irradiation to a UV-transparent matrix and UV-absorbing fibres. The influence of UV treatment on the composite properties is evaluated by tensile, interfacial and interlaminar shear strength tests. The UV irradiation decreases the critical fragment length in single fibre fragmentation tests, indicating an improved fibre-matrix adhesion. The UV-irradiated composites’ tensile strength and Young’s modulus are found to be ~10% (for 3- and 8-minute irradiation) and ~50% (for 8-minute irradiation), respectively, higher than those of the untreated samples. Furthermore, the UV irradiation leads to an improvement in the interlaminar shear strength by 25%. The variation of the UV-irradiation time (3 min and 8 min) and the comparison of the properties of semi-finished composite sheets and composites also reveal chemical and physical changes in the regenerated cellulose fibres due to heat adsorption. The proposed mechanism of interfacial crosslinking is confirmed by FTIR spectroscopy. The results suggest an approach to overcome poor compatibility between hydrophobic polyolefin matrix and hydrophilic cellulose-based fibres, resulting in adhesive-free bio-based composites.
    journal article
      97
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    Unidirectional Tape‐Based Composites from Hemp and Pineapple Leaf Fiber: Mechanical Performance in Conventional and Bio‐Based Matrices
    (Wiley, 2025-12)
    Graupner, Nina
    ;
    Bade, Raja
    ;
    Ackermann, Valentin
    ;
    Baumann, Roja M.
    ;
    Bischoff, Corvin
    A newly developed unidirectional semi-finished product made from hemp or pineapple leaf fibers (PALF) is examined for its reinforcing potential in various polymer matrices, including epoxy, bio-based epoxy, polyhydroxyalkanoate (PHA), polybutylene adipate terephthalate (PBAT), and polylactide (PLA), at a fiber volume fraction of ≈40%. Compression-molded composites are characterized with respect to mechanical properties, interlaminar shear strength (ILSS), density, and void content. All systems show promising performance, with tensile strengths ranging from 110 MPa for PALF/PHA to 227 MPa for hemp/bio-based epoxy, and Young's moduli ranging from 9.8 to 22.7 GPa. At comparable ILSS levels, hemp-based composites exhibit higher strengths and stiffnesses, whereas PALF composites show increased void content. The observed microvoids appear less detrimental than macrovoids, supporting the materials’ suitability for lightweight structures. PALF composites demonstrate greater toughness than their hemp counterparts, with PALF/bio-based epoxy achieving an unnotched Charpy impact strength of 39 kJ m−2 compared with 29 kJ m−2 for hemp/bio-based epoxy. Although the full tensile strength potential of PALF cannot be realized—because the composites do not reach the fibers’ maximum elongation and therefore their maximum stress—the combination of low density and favorable mechanical behavior highlights both PALF and hemp-based composites as promisi ng candidates for structural lightweight applications.
    journal article
      14