研究目的
Investigating the β-phase crystallization of poly(vinylidene fluoride) in poly(vinylidene fluoride)/poly(ethyl methacrylate) blends.
研究成果
Blending PVDF with PEMA allows control over the nature of its crystalline phase, with the highest amount of β phase PVDF obtained in the PVDF/PEMA (3:2) blend. The addition of PEMA promotes the formation of PVDF β nuclei, and the quenching-annealing process is crucial for achieving the β phase. UFDSC was successfully used to model the quenching process and study the crystallization behavior.
研究不足
The study is limited by the inability to fully characterize the final structure of the samples due to very small dimensions and high instability of the nano-calorimetric samples. New methods like in situ WAXS combined with UFDSC are suggested for further characterization.
1：Experimental Design and Method Selection:
The study involved the preparation of PVDF/PEMA blends with various compositions, quenching from the melt, and annealing above the glass transition temperature. Techniques such as XRD, IR, and DSC were employed to characterize the crystalline phases.
2：Sample Selection and Data Sources:
PVDF and PEMA were dissolved in THF and mixed in different weight ratios. The blends were precipitated, washed, and subjected to different thermal treatments.
3：List of Experimental Equipment and Materials:
XRD experiments were carried out on a Bruker D8 Advance X-ray diffractometer, IR spectroscopy measurements on a Nicolet iSIO IR instrument, and DSC experiments on Mettler-Toledo DSC1 and UFDSC.
4：Experimental Procedures and Operational Workflow:
Samples were heated to 500 K, quenched to room temperature, and annealed at 418 K for 3 days. UFDSC was used to model the quenching process with fast cooling rates.
5：Data Analysis Methods:
The crystalline structure was analyzed using XRD and IR, while DSC was used to study the melting behavior and crystallization kinetics.
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