Molecular mobility and thermal transitions study in renewable PLA-polyols star-like copolymers

Fabrication of Poly(ethylene furanoate)/Silver and Titanium Dioxide Nanocomposites with Improved Thermal and Antimicrobial Properties

“…The β relaxation of neat PEF exhibits a similar time scale in accordance with previous studies [51]. Interestingly, β is accelerated in PEF-Ag, accompanied by a slight decrease in its activation energy.…”

“…Following previous routes, a critical analysis in terms of fitting widely adopted model functions (Havriliak-Negami, Cole-Cole) was performed [51][52][53]. The results of this analysis are shown in Figure 9 in terms of timescale (relaxation frequency maxima vs. temperature, Figure 9a and dielectric strength, ∆ε, vs. temperature, known as the dielectric relaxation activation map.…”

“…The results of this analysis are shown in Figure 9 in terms of timescale (relaxation frequency maxima vs. temperature, Figure 9a and dielectric strength, Δε, vs. temperature, known as the dielectric relaxation activation map. In Figure 9a, the curved and straight lines connecting the experimental points have been added to represent the respective fitting of the Vogel-Tammann-Fulcher-Hesse and the Arrhenius equations, respectively, to α and β relaxation [51]. More precisely, the linear time scale behavior denotes that the activation energy is constant (independent from the temperature), which is the case for local dynamics.…”

Structure–property relationships in renewable composites of poly(lactic acid) reinforced by low amounts of micro- and nano-kraft-lignin

“…This is compatible with the previously mentioned increase of the polymer concentration around the lignins and subsequently the decrease of polymer density away from them. Such a situation has been observed before in PLA-based systems 21,27,30,32 as well as in other polymers. 65…”

“…20,21,25,28 Except for the PLA's performance within the application, there is a general desire to facilitate its physical degradation, for example in soil – compostability, which in the case of bulk PLA is rather slow. 8,29 Additionally, PLA exhibits high potential for combination with other polymers (copolymers, blends, interpenetrating polymer networks, and stars) 12,22,30–32 as well as with inorganic/organic fillers and nanoparticles. 24,33,34 The latter case, i.e.…”