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Crystalline morphology in high‐density polyethylene/paraffin blend for thermal energy storage
Author(s) -
Lee Chang Hyung,
Choi Hyeong Ki
Publication year - 1998
Publication title -
polymer composites
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.577
H-Index - 82
eISSN - 1548-0569
pISSN - 0272-8397
DOI - 10.1002/pc.10143
Subject(s) - high density polyethylene , materials science , composite material , polyethylene , spherulite (polymer physics) , scanning electron microscope , ultra high molecular weight polyethylene , morphology (biology) , polymer , biology , genetics
The durability of high‐density polyethylene (HDPE)/ paraffin blends as a thermal energy storage material was studied by investigation of the seepage behavior of paraffin. The HDPE in the blends serves to prevent paraffin seepage during repeated heating‐cooling cycles; i.e., the HDPE acts as a sealant material. Two representative HDPEs were used for the blends; one was a low molecular weight HDPE (1‐HDPE) and the other was a high molecular weight HDPE (h‐HDPE). Investigation by optical microscopy, scanning electron microscopy and light scattering revealed that the surface area of an injection molded sample in h‐HDPE/paraffin blend had compact spherulites of about 7 μm in radius. On the other hand, the morphology of the coarse spherulite of about 15 μm in radius is observed in the 1‐HDPE/paraffin blend. This crystalline morphological characteristic resulting from the molecular weight difference of the sealant material (HDPE) is responsible for the excellent sealant property of the h‐HDPE/paraffin blend.