Highly Intrinsic Thermally Conductive Electrospinning Film with Intermolecular Interaction

Abstract

A series of poly(vinylidene fluoride) (PVDF)/ poly(vinyl alcohol) (PVA) composite films with different ratios were prepared by electrospinning. Because of the intermolecular interaction force, the highest thermal conductivity of the above film is 2.434 W m −1 K −1 , which is about 60% higher than that of the pure PVDF film without a strong intermolecular interaction force. Infrared and wide-angle X-ray diffraction (WXAD) proved that PVDF as a thermal bridge enhances the internal interaction force and makes the internal structure more regular. The laser method shows that the film with strong intermolecular interaction has higher thermal diffusivity. Using molecular dynamics to explore the thermal expansion rate of the system, it is found that the intermolecular interaction force and the thermal bridge can effectively inhibit the activity of the molecular chain and reduce its free volume. After an in-depth study of the influence of the intermolecular interaction force and the thermal bridge on polymers, it is found that electrospinning can conveniently and effectively improve the ordering of the polymer structure. Integration of the electrospinning method and intermolecular interaction leads to the remarkable improvement of intrinsic thermal conductivity for polymer blends.

Advancing Nanofiber Research: Assessing Nonsolvent Contributions to Structure Using Coaxial Electrospinning

“…It seemed that the relative volatility of nonsolvent compared to solvent failed to fully explain the nonsolvent-induced phase separation process in generating pores inside nanofibers . Instead, intermolecular interactions between nonsolvent molecules and polymer chains appear to be key in determining whether phase separation occurs in creating porous nanofibers . Both water and EG molecules can form hydrogen bonds with the nitrile (−CN) groups in PAN, leading to intermolecular interactions that may induce phase separation .…”

“… 20 Instead, intermolecular interactions between nonsolvent molecules and polymer chains appear to be key in determining whether phase separation occurs in creating porous nanofibers. 42 Both water and EG molecules can form hydrogen bonds with the nitrile (−C≡N) groups in PAN, leading to intermolecular interactions that may induce phase separation. 43 However, water, being a small and highly polar molecule, forms stronger hydrogen bonds due to its size and polarity, whereas EG, a larger and less polar molecule, may not induce phase separation as effectively as water in PAN solutions.…”

Research progress of intrinsic polymer dielectrics with high thermal conductivity

“…Kim G H [68] found that the PAA/PAP (poly[N-acryloyl piperidine]) blend yields a sharp increase in TC over 1.5 W/(m⋅K) due to the formation of multiscale dense and homogeneously distributed inter-chain H-bond linkers as a thermal network to facilitate phonon transport. The PVDF/PVA blend prepared by electrospinning shows the highest TC of 2.434 W/(m⋅K) [69]. Integrating the electrospinning strategy and H-bond enhanced inter-chain interaction can effectively inhibit the chain motion and reduce free volume, thus leading to the remarkable improvement in TC.…”

Global minimum and a heap of low-lying isomers with planar tetracoordinate carbon in the CAl3MgH2− system

“…18,19,31,32 It is noteworthy to mention that the clusters C 2 Al 4 and C 5 Al 5 À , which comprised ptC, were first predicted computationally and were then observed experimentally. [32][33][34][35] This serves as an illustration of the potential of computational chemistry calculations to enlighten and direct experimental research in the realm of chemical laboratories. Many other molecules like CAl 4 Mg 0/À , CSiGaAl 2 À/0…”