Home » Enhancing thermal conductivity of poly-hydroxy-alkanoates (PHA) to reduce flash in injection molded parts. by Rahul Daga
Enhancing thermal conductivity of poly-hydroxy-alkanoates (PHA) to reduce flash in injection molded parts. Rahul Daga

Enhancing thermal conductivity of poly-hydroxy-alkanoates (PHA) to reduce flash in injection molded parts.

Rahul Daga

Published
ISBN : 9780549982685
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Enhancement of thermal conductivity in a polymer not only makes it suitable for a variety of applications like heat sinks, ICs, heat pipes but could also improve the part aesthetically by getting rid of flash or shrinkage.-One such polymer thatMoreEnhancement of thermal conductivity in a polymer not only makes it suitable for a variety of applications like heat sinks, ICs, heat pipes but could also improve the part aesthetically by getting rid of flash or shrinkage.-One such polymer that exhibits flashing in molding is PHA (Poly-hydroxy-alkanoate). A thermal and shear sensitive polymer, PHA, is a good example for studying the above concept.-Talc (a low thermal conductivity filler) and boron nitride (BN) (a very high thermal conductivity filler) were incorporated into PHA at loading levels of 5, 10, 15, 20, 30 and 40% by weight. Boron nitride due to its very high thermal conductivity and its ability to form thermally conductive channels, eliminate hot spots in melt, and uniformly distribute heat throughout the melt gave better results in terms of flash reduction.-The filler loading levels of talc and BN with matching viscosities were tested for thermal conductivity of the melt supporting the idea that it is solely the thermal conductivity of the melt which is instrumental in flash reduction. The thermal conductivity of BN-filled polymer was 0.279 W/m-K while the thermal conductivity of talc-filled PHA was 0.188 W/m-K which was only slightly higher than the thermal conductivity of unfilled PHA which was 0.178 W/m-K.