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    Barrier properties of polymer and biopolymer nanocomposites
    (Elsevier, 2025) Aydemir, Deniz; Kelleci, Orhan; Al, Gulyaz; Yalcin, Omer Umit
    This section focuses on the barrier properties of polymer and biopolymer nanocomposites. The use of nanotechnology in polymeric materials has the potential to make significant advances, especially in packaging and medical applications. Nanocomposites prepared with various nanofillers enhance the barrier properties of polymeric materials in different fields, thereby extending the shelf life of food packaging products. Environmental concerns have increased the popularity of biopolymer-based or biodegradable high-performance packaging types. Biopolymer-based packaging materials offer sustainable, environmentally friendly, biodegradable, biocompatible, nontoxic, and easily available alternatives. However, despite their environmental advantages, biopolymers tend to show low performance in terms of mechanical strength and water resistance. Studies have shown that incorporating various nanofillers can improve the hydrophobic behavior and provide high resistance properties to biopolymers. Additionally, with the help of these nanofillers, biopolymers can also acquire biological properties such as antibacterial and antifungal activity. This chapter presents a comprehensive evaluation of the barrier properties of polymer and biopolymer nanocomposite blends, including gas permeability (oxygen and CO?), water vapor resistance, and UV resistance. © 2026 Elsevier Ltd. All rights reserved..
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    Microwave-assisted graft copolymerization effects on the material properties of polyhydroxybutyrate-cellulose nanocrystal nanocomposites
    (Springer, 2025) Al, Gulyaz; Aydemir, Deniz; Altuntas, Ertugrul
    This study examined the influence of polyhydroxybutyrate grafted maleic anhydride (PHB - g - MA) copolymer on the mechanical, structural, thermal, morphological, and rheological properties of polyhydroxybutyrate (PHB)-cellulose nanocrystal (CNC) nanocomposites. The results showed that the adding PHB - g - MA and CNCs had a positive effect on the mechanical and morphological properties of the BNCs (biopolymer nanocomposites). According to the DSC results, there were slight changes in the crystallization temperature (Tc) and the melting temperature (Tm) of the BNCs, and the DMA curves showed that the inclusion of PHB - g - MA resulted in an increase in the storage and loss moduli. The XRD results showed four main peaks with 2 theta values of 13.57 degrees, 16.98 degrees, 22.2 degrees, and 25.39 degrees with the presence of both PHB - g - MA and CNCs. In rheological studies, it was determined that both elastic and viscous moduli of the neat PHB and the BNCs generally increased as the frequency value was raised.