Thermal and Mechanical Properties of Thermoplastic Starch Blends

U ovom radu pripremljene su mješavine na osnovi polietilena niske gustoće (PE-LD) i termoplastičnog škroba (TPS) s ciljem dobivanja biorazgradljivog polimernog materijala za primjenu kao ambalažnog materijala. Provedena je karakterizacija toplinskih, mehaničkih svojstava kao i propusnost vodene pare zbog izrazitog hidrofilnog karaktera škroba. Dodatak TPS-a u PE-LD/TPS mješavinama utječe na porast stupnja kristalnosti do udjela od 20 mas. % zbog nukleacijskog učinka TPS-a. Prekidno naprezanje i prekidno istezanje smanjuju se porastom udjela TPS-a u PE-LD/TPS mješavinama, dok modul elastičnosti raste. Temperatura početka razgradnje pomiče se na niže temperature, što ukazuje na smanjenje toplinske stabilnosti PE-LD-a dodatkom TPS-a. Glicerol kao plastifikator škroba utječe na povećanje toplinske stabilnosti škroba, no pokazuje negativan učinak na propusnost vodene pare. Ovo djelo je dano na korištenje pod licencom Creative Commons Imenovanje 4.0 međunarodna.Blends of low-density polyethylene (PE-LD) and thermoplastic starch (TPS) were prepared in order to obtain a biodegradable polymeric material as a packaging material. The characterization of thermal and mechanical properties, as well as water vapour permeability was performed due to the highly hydrophilic character of the starch. The addition of TPS to PE-LD/TPS blends influenced the degree of crystalline to 20 wt. % due to nucleation effect of TPS. The tensile strength and elongation at break decreased by increasing the starch level in the PE-LD/TPS blends, but the elastic modulus increased. The initial decomposition temperature shifted to a lower temperature, indicating a reduction in the thermal stability of PE-LD by addition of TPS. Glycerol as a starch plasticizer contributed to increasing the thermal stability of starch, but had a negative effect on water vapour permeability. This work is licensed under a Creative Commons Attribution 4.0 International License