期刊
POLYMERS
卷 13, 期 13, 页码 -出版社
MDPI
DOI: 10.3390/polym13132214
关键词
2D-TMDCs WS2; PLLA; nanomaterials; morphology; crystallization; melting
资金
- FEDER/Ministerio de Ciencia, Innovacion y Universidades-Agencia Estatal de Investigacion [MAT2017-84691-P]
- Ministerio de Economia y Competitividad (MINECO), Spain [CTQ2017-84131-R, RED2018-102387-T]
In this study, hybrid nanocomposite materials were prepared by solution blending PLLA with 2D-WS2, revealing that the incorporation of 2D-WS2 influences the crystallization rate and final crystallinity of PLLA, while increasing the nanosheet content leads to a transition from retardation to promotion of crystallization. The double-melting peaks observed were mainly derived from melting-recrystallization-melting processes upon heating, highlighting the potential of PLLA/hybrid nanocomposites in targeted applications.
In the present work, hybrid nanocomposite materials were obtained by a solution blending of poly(l-lactic acid) (PLLA) and layered transition-metal dichalcogenides (TMDCs) based on tungsten disulfide nanosheets (2D-WS2) as a filler, varying its content between 0 and 1 wt%. The non-isothermal cold- and melt-crystallization and melting behavior of PLLA/2D-WS2 were investigated. The overall crystallization rate, final crystallinity, and subsequent melting behavior of PLLA were controlled by both the incorporation of 2D-WS2 and variation of the cooling/heating rates. In particular, the analysis of the cold-crystallization behavior of the PLLA matrix showed that the crystallization rate of PLLA was reduced after nanosheet incorporation. Unexpectedly for polymer nanocomposites, a drastic change from retardation to promotion of crystallization was observed with increasing the nanosheet content, while the melt-crystallization mechanism of PLLA remained unchanged. On the other hand, the double-melting peaks, mainly derived from melting-recrystallization-melting processes upon heating, and their dynamic behavior were coherent with the effect of 2D-WS2 involved in the crystallization of PLLA. Therefore, the results of the present study offer a new perspective for the potential of PLLA/hybrid nanocomposites in targeted applications.
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