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Supplementary Materials
Insulative ethylene-propylene copolymer-nanostructured polypropylene for high-
voltage cable insulation applications
Seunggun Yu*,†, Seong Hwan Lee†, Jin Ah Han, Myung Sang Ahn, Hoyyul Park, Se Won
Han*, Dae Ho Lee*
Insulation Materials Research Center, Korea Electrotechnology Research Institute (KERI),
Gyeongsangnam-do 51543, Korea
*Corresponding author(s): S.Yu ([email protected]), S.W.Han ([email protected]), D.H.Lee
†These authors equally contributed to the paper.
Supplementary Materials
Table S1. Materials and Characteristics
PP EOC rPP
Supplier SK Chemical LG Chemical SK Chemical
Grade H350F LC170 R362Y
Melt flow index (g/10 min) 7.0 1.1 14.0
Softening temperature (oC) 154.0 - 135.0
Hardness (Shore A) 95.0 9.5 28.0
Contact angle in water (o) 94.7 ± 1.0 103.4 ± 1.5 100.1 ± 0.9
Contact angle in DIM (o) 49.0 ± 0.9 60.5 ± 1.1 52.3 ± 0.8
Surface energy (mJ/m2) 34.7 ± 0.4 28.1 ± 0.6 32.7 ± 0.5
Supplementary Materials
Figure S1. Optical microscopic images observing contact angle of water onto (a) PP, (b)
EOC, and (c) rPP, and DIM onto (d) PP, (e) EOC, and (f) rPP, respectively.
Supplementary Materials
Figure S2. SEM images of PP blends with EOC of (a,d) 10 wt%, (b,e) 20 wt%, and (c,f) 30 wt%, respectively.
Supplementary Materials
Figure S3. Illustrated images of (a) rPP0, (b,e) rPP25, (c,f) rPP50, and (d,g) rPP75, respectively, which are extracted by ImageJ program.
Supplementary Materials
Figure S4. XRD graphs of rPP, rPP25, rPP50, rPP75, and rPP100, respectively.