Direct identification of three crystalline phases in PEO-b-PCL-b-PLLA triblock terpolymer by In situ hot-stage atomic force microscopy

Autor: Heng Zhang, Bin Zhang, Nikos Hadjichristidis, Jordana K. Palacios, Alejandro J. Müller
Přispěvatelé: European Commission
Rok vydání: 2020
Předmět:
Zdroj: Addi: Archivo Digital para la Docencia y la Investigación
Universidad del País Vasco
Polymer
Addi. Archivo Digital para la Docencia y la Investigación
instname
ISSN: 0032-3861
2017-8301
Popis: Unformatted preprint version of the submitted article In this work, we provide a detailed description of the tri-lamellar nanoscale morphology of a triple crystalline PEO-b-PCL-b-PLLA triblock terpolymer obtained by Hot-Stage Atomic Force microscopy (AFM) imaging and Wide Angle X-ray scattering (WAXS) analysis for the first time. The precursor PCL-b-PLLA diblock copolymer has also been included in the study for comparison purposes. A two-step crystallization protocol has been applied to create a distinct lamellar morphology. Both WAXS and AFM revealed the double crystalline nature of the diblock copolymer. However, the identification of multiple crystalline phases in the triblock terpolymer by AFM and WAXS at room temperature is not straightforward. The advantages of hot-stage AFM allowed following the evolution of the lamellar morphology and the successive melting of the tricrystalline PEO-b-PCL-b-PLLA sample during heating. Taking into account the melting temperature of each crystalline block, the existing lamellar populations were clearly identified. At 45 °C, the thinnest lamellae disappeared, due to the melting of PEO crystals. The medium size lamellae disappeared at 60 °C when PCL crystals melt. At that temperature, the only remaining crystals are those of the PLLA block. AFM mechanical modulus images provide further evidence of the lamellar self-assembly of the triblock terpolymer. The nanoscale arrangement includes lamellae of PCL, PEO, or both in between the PLLA lamellae. Hot-Stage AFM is a valuable technique to elucidate the morphological features of complex multi-crystalline systems. This work has received funding from the European Union´s Horizon 2020 research and innovation program under the Marie Sklodowska-Curie grant agreement No 778092, from MINECO, project: MAT2017-83014-C2-1-P and from the Basque Government through grant IT1309-19. We are grateful to the National Science Foundation of China (nos. 51773182, 51973202), The Young Out-standing Teachers of the University in Henan Province (2019GGJS003). N.H. acknowledges the support of King Abdullah University of Science and Technology (KAUST).
Databáze: OpenAIRE
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