| Autor: |
Paszkiewicz S; Department of Materials Technologies, West Pomeranian University of Technology, Al. Piastow 19, PL-70310 Szczecin, Poland. sandra.paszkiewicz@zut.edu.pl., Irska I; Department of Materials Technologies, West Pomeranian University of Technology, Al. Piastow 19, PL-70310 Szczecin, Poland. sandra.paszkiewicz@zut.edu.pl., Zubkiewicz A; Department of Physics, West Pomeranian University of Technology, Al. Piastow 48, PL-70311 Szczecin, Poland., Walkowiak K; Department of Materials Technologies, West Pomeranian University of Technology, Al. Piastow 19, PL-70310 Szczecin, Poland. sandra.paszkiewicz@zut.edu.pl., Rozwadowski Z; Department of Inorganic and Analytical Chemistry, West Pomeranian University of Technology, Al. Piastów 42, PL-71065 Szczecin, Poland., Dryzek J; Institute of Nuclear Physics PAS, ul. Radzikowskiego 152, PL-31342 Cracow, Poland., Linares A; Instituto de Estructura de la Materia, IEM-CSIC, Serrano 121, Madrid 28006, Spain., Nogales A; Instituto de Estructura de la Materia, IEM-CSIC, Serrano 121, Madrid 28006, Spain., Ezquerra TA; Instituto de Estructura de la Materia, IEM-CSIC, Serrano 121, Madrid 28006, Spain. |
| Abstrakt: |
In the present study, a fully plant-based sustainable copolyester series, namely poly(butylene 2,5-furandicarboxylate)- block -poly(caprolactone)s (PBF- block -PCL)s were successfully synthesized by melt polycondensation combining butylene 2,5-furandicarboxylate with polycaprolactone diol (PCL) at different weight ratios. Differential scanning calorimetry (DSC) showed that only PBF underwent melting, crystallization from the melt, and cold crystallization. Thermogravimetric analysis (TGA) revealed outstanding thermal stability, exceeding 305 °C, with further improvement in thermal and thermo-oxidative stability with increasing PCL content. Broadband dielectric spectroscopy (BDS) revealed that at low temperatures, below the glass transition ( T g ) all copolyesters exhibited two relaxation processes ( β 1 and β 2 ), whereas the homopolymer PBF exhibited a single β -relaxation, which is associated with local dynamics of the different chemical bonds present in the polymer chain. Additionally, it was proved that an increase in PCL content affected the dynamics of the chain making it more flexible, thus providing an increase in the value of the room temperature free volume fractions ( f v ) and the value of elongation at break. These effects are accompanied by a decrease in hardness, Young's modulus, and tensile strength. The described synthesis enables a facile approach to obtain novel fully multiblock biobased copolyesters based on PBF and PCL polyesters with potential industrial implementation capabilities. |
