TY - JOUR U1 - Zeitschriftenartikel, wissenschaftlich - begutachtet (reviewed) A1 - Azevedo, Juliana V. C. A1 - Ramakers-van Dorp, Esther A1 - Hausnerova, Berenika A1 - Möginger, Bernhard T1 - The Effects of Chain-Extending Cross-Linkers on the Mechanical and Thermal Properties of Poly(butylene adipate terephthalate)/Poly(lactic acid) Blown Films JF - Polymers N2 - This study investigates the effects of four multifunctional chain-extending cross-linkers (CECL) on the processability, mechanical performance, and structure of polybutylene adipate terephthalate (PBAT) and polylactic acid (PLA) blends produced using film blowing technology. The newly developed reference compound (M·VERA® B5029) and the CECL modified blends are characterized with respect to the initial properties and the corresponding properties after aging at 50 °C for 1 and 2 months. The tensile strength, seal strength, and melt volume rate (MVR) are markedly changed after thermal aging, whereas the storage modulus, elongation at the break, and tear resistance remain constant. The degradation of the polymer chains and crosslinking with increased and decreased MVR, respectively, is examined thoroughly with differential scanning calorimetry (DSC), with the results indicating that the CECL-modified blends do not generally endure thermo-oxidation over time. Further, DSC measurements of 25 µm and 100 µm films reveal that film blowing pronouncedly changes the structures of the compounds. These findings are also confirmed by dynamic mechanical analysis, with the conclusion that tris(2,4-di-tert-butylphenyl)phosphite barely affects the glass transition temperature, while with the other changes in CECL are seen. Cross-linking is found for aromatic polycarbodiimide and poly(4,4-dicyclohexylmethanecarbodiimide) CECL after melting of granules and films, although overall the most synergetic effect of the CECL is shown by 1,3-phenylenebisoxazoline. KW - polylactic acid KW - polybutylene adipate terephthalate KW - chain extenders cross-linker KW - thermo-mechanical properties KW - blow molding UN - https://nbn-resolving.org/urn:nbn:de:hbz:1044-opus-58744 SN - 2073-4360 SS - 2073-4360 U6 - https://doi.org/10.3390/polym13183092 DO - https://doi.org/10.3390/polym13183092 PM - 34577992 VL - 13 IS - 18 SP - 13 S1 - 13 PB - MDPI CY - Basel ER -