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The Effect of WS2 Nanosheets on the Non-Isothermal Cold- and Melt-Crystallization Kinetics of Poly(l-lactic acid) Nanocomposites

Abstract : 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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https://hal-centralesupelec.archives-ouvertes.fr/hal-03594660
Contributor : Carmen Moya Lopez-Pelaez Connect in order to contact the contributor
Submitted on : Wednesday, March 2, 2022 - 6:04:28 PM
Last modification on : Wednesday, March 9, 2022 - 2:18:01 PM

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Carmen Moya Lopez-Pelaez, Mohammed Naffakh, Pablo Rica, Carmen Moya-Lopez, José Antonio Castro-Osma, et al.. The Effect of WS2 Nanosheets on the Non-Isothermal Cold- and Melt-Crystallization Kinetics of Poly(l-lactic acid) Nanocomposites. Polymers, MDPI, 2021, 13 (13), pp.2214. ⟨10.3390/polym13132214⟩. ⟨hal-03594660⟩

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