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

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    Type
    Article
    Authors
    Palacios, Jordana K.
    Zhang, Heng
    Zhang, Bin
    Hadjichristidis, Nikos cc
    Müller, Alejandro J.
    KAUST Department
    Chemical Science Program
    KAUST Catalysis Center (KCC)
    Physical Science and Engineering (PSE) Division
    Polymer Synthesis Laboratory
    Date
    2020-08-04
    Online Publication Date
    2020-08-04
    Print Publication Date
    2020-09
    Embargo End Date
    2022-08-13
    Submitted Date
    2020-05-16
    Permanent link to this record
    http://hdl.handle.net/10754/664637
    
    Metadata
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    Abstract
    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 and the analysis of the cross-sectional heights provide further evidence of the lamellar self-assembly of the triblock terpolymer. It was found that two lamellar arrangements are possible at room temperature; either a perfect interdigitation where PCL and PEO lamellae are sandwhiched between PLLA lamellae (i.e., PLLA/PEO/PCL/PLLA), or only one PEO or PCL lamella in between two PLLA lamellar crystals distributed randomly (i.e., PLLA/PEO/PLLA or PLLA/PCL/PLLA). Hot-Stage AFM is a valuable technique to elucidate the complex morphological features of multi-crystalline systems.
    Citation
    Palacios, J. K., Zhang, H., Zhang, B., Hadjichristidis, N., & Müller, A. J. (2020). Direct identification of three crystalline phases in PEO-b-PCL-b-PLLA triblock terpolymer by In situ hot-stage atomic force microscopy. Polymer, 205, 122863. doi:10.1016/j.polymer.2020.122863
    Sponsors
    In this paper, we take advantage of the Hot-Stage AFM approach to provide a clear elucidation of the trilayered lamellar morphology of an ABC-type triple crystalline triblock terpolymer. To our knowledge, this is the first time that Hot-Stage AFM is employed to identify three different crystalline phases successfully. The PEO-b-PCL-b-PLLA is a triblock terpolymer with an alternating superstructure of three crystalline phases, as we had published previously [4, 35–38]. Here, we report the in situ hot-stage AFM observations of the sequential melting of isothermally crystallized PEO-b-PCL-b-PLLA terpolymer. Complementary WAXS analysis is provided to support the AFM evidence. Assessing the distribution of discrete crystals provides a deeper understanding of the sequential crystallization and melting in PEO-b-PCL-b-PLLA triblock terpolymers.We would like to thank the financial support provided by the BIODEST project. This project has received funding from the European Union's Horizon 2020 research and innovation programme under the Marie Skłodowska-Curie grant agreement No 778092. We also acknowledge funding 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).
    Publisher
    Elsevier BV
    Journal
    Polymer
    DOI
    10.1016/j.polymer.2020.122863
    Additional Links
    https://linkinghub.elsevier.com/retrieve/pii/S003238612030690X
    ae974a485f413a2113503eed53cd6c53
    10.1016/j.polymer.2020.122863
    Scopus Count
    Collections
    Articles; Physical Science and Engineering (PSE) Division; Chemical Science Program; KAUST Catalysis Center (KCC)

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