Thermal stability of poly(l-lactide) α' crystals and its blocking effect on perfection of α crystals. (June 2020)

• Record Type: Journal Article
• Authors: Zhu, Rui; Zheng, Run; Fu, Lianlian; Li, Zhaolei; Yan, Chao
• Is Part Of: Materials today communications. Volume 23(2020)
• Publication Date: 2020-06
• Subjects: Poly(l-lactide) -- α'-Crystals -- Thermal stability -- Annealing -- Lamella thickness; Materials science -- Periodicals; 620.11
• DOI: 10.1016/j.mtcomm.2020.100900
• Languages: English
• ISSNs: 2352-4928

Abstract

Graphical abstract: Abstract: Thermal stability of poly(L-lactide) (PLLA) α' crystals and its blocking effect on perfection of α crystals was reported in this manuscript. The results showed that, with annealing temperature (Ta ) approaching to 150 °C, most α' crystals transformed into α crystals, and the others with higher thermal stability still existed in those annealed samples. Interestingly, experiencing identical annealing, α crystals with residual α' crystals displayed the bigger long period but the smaller lamella thickness than that of α crystals directly formed at 130 °C. Further, after the residual α' crystals were totally melted, during annealing at a higher temperature, both lamella thickness and crystallinity of α crystals increased faster than that of α crystals with residual α' crystals, even the latter was annealed at a lower temperature. This result is considered to promote understanding of the genesis of the PLLA α՛ crystals and the mechanism of α՛ to α transformation.