Journal
MACROMOLECULAR RESEARCH
Volume 24, Issue 1, Pages 74-82Publisher
POLYMER SOC KOREA
DOI: 10.1007/s13233-016-2015-7
Keywords
PP-EPDM blend; nanocomposites; nanofillers; non-isothermal crystallization; electrical property
Categories
Funding
- National Natural Science Foundation of China [51203002, 51273001]
- Anhui University [ZLTS2015059, 201510357142, J18515262]
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In this study, nanofillers composed of hydroxylated carbon nanotubes (h-CNT), carbon nanotubes (CNT) and graphene (GR) were separately added into the dynamically-vulcanized polypropylene (PP)/ethylene-propylenediene monomer (EPDM) blend. Differential scanning calorimetry (DSC), wide-angle X-ray diffraction (WAXD) and electrical resistivity measurements were employed to study the effect of nanofillers on the melt behavior, non-isothermal crystallization behavior and electrical conductivity of the prepared composites. WAXD results showed that h-CNT had a better induction effect of beta-PP in the nanocomposites. The sequence of the activity in inducing the formation of beta-PP was h-CNT > GR > CNT. However, the total crystallinity of the nanocomposites nearly remained constant. Non-isothermal crystallization kinetic analysis indicated that the presence of nanofillers improved the crystallization rate of the nanocomposites. The consequence of nucleation activity was as follows: CNT > GR > h-CNT. Although EPDM hindered the macromolecular motion of PP, interestingly it could increase the crystallization rate to an extent. Besides, the influence of nanofillers on enhancing the conductive property of the nanocomposites can be ranked as follow: CNT > GR > h-CNT.
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