Доступ предоставлен для: Guest

ISSN Online: 2377-424X

ISBN Print: 978-1-56700-474-8

ISBN Online: 978-1-56700-473-1

International Heat Transfer Conference 16
August, 10-15, 2018, Beijing, China

ENHANCEMENT OF THERMAL CONDUCTIVITY OF ELECTROSPINNING PVA NANO-FIBER FILM BY DOPING SILVER NANOWIRES

Get access (open in a dialog) DOI: 10.1615/IHTC16.nmt.022725
pages 6947-6954

Аннотация

Flexible substrates that host electronic components are essential parts of soft electronics. The continuing miniaturization of these electronics requires the substrates with high thermal conductivity to avoid function failure and lifetime reduction. However, soft and mechanically deformable systems have typically low thermal conductivity. Here, we fabricate a flexible polyvinyl alcohol (PVA) nano-fiber film (PVANFF) by the electrospinning technique, which exhibits excellent flexibility and high thermal conductivity simultaneously. The effective thermal conductivity of the PVANFF along the fiber axis is 0.41 W/m-K (32% more than the value of bulk PVA). This excellent performance is attributed to polymer molecular chain alignment and fibrous structural improvements, which are resulted from the high strain rates during the electrospinning process. Furthermore, we enhance the thermal conductivity of the PVANFF by doping it with silver nanowires (AgNWs) whose effective thermal conductivity along the fiber can reach 0.49 W/m-K (58% more than the value of bulk PVA). And we also measure the PVANFF (doped with/without AgNWs) without the air between the fibers by filling it with amorphous PVA. And the thermal conductivity along the fiber of PVANFF doped with AgNWs is 0.44 W/m-K (42% more than the value of PVA). Our study provides design guidance for flexible substrates.