Impact of synthetic talc on PLLA electrospun fibers

Chemical modification routes of synthetic talc: Influence on its nucleating power and on its dispersion state

“…But in both cases, the crystalline lamellae of the PP matrix nucleated on the filler are clearly oriented as a result of the alignment of the talc layers in the shearing plane (Fiorentino et al, 2013). The same trend was observed in the works of Monticelli et al (2003) that highlighted that the incorporation of talc increased chain orientation in the electrospun fibers promoting the development of the more thermally stable standard α-form. As a result, the more crystalline character of natural talc with respect to synthetic talc is going to induce a higher reinforcing effect on the polymer matrix.…”

Development of polylactide bead foams with double crystal melting peaks

“…Schematics of (a) forming the double-peak crystals (i.e., the crystals with a high melting temperature and crystals with a low melting temperature), and (b) the actual experimental procedure used to form these double-peak crystals within the DSC. expediting the cold crystallization at lower temperatures [44]. All of the as received samples were amorphous with no crystallinity.…”

“…As outlined in our introduction, the low melting temperature peak forms after the saturation step during the cooling process while foaming occurs. In the PLA samples, crystallization of the low melting temperature peak must have occurred faster during cooling in the following order: PLA-TL > PLA-T > PLA [44,54]. Faster crystallization during cooling can also inhibit foam expansion due to the increased stiffness of the PLA matrix while the samples expand [33].…”

PLA maleation: an easy and effective method to modify the properties of PLA/PCL immiscible blends

“…The presence of double/multiple melting peaks is a commonly observed phenomenon for semicrystalline polyesters, caused by the existence of melting and recrystallization processes. In the specific case of PLA, some authors have interpreted it as arising from a phase transition (from the less stable α′ form to the more perfect α polymorph, melting at higher temperature) [33,34]. Whatever mechanism is taking place during the heating scan of the PLA matrix (recrystallization or phase transition), it is clear that such behavior is influenced by the PLA-g-MA content in the blend, the reorganization phenomena becoming more evident together with the crystallization extent on increasing the amount of PLA-g-MA.…”