Abstract
In this work, polyaniline (PANI) in emeraldine-base form, synthesized by chemical oxidation polymerization, was protonated with hydrochloric acid (HCl). Composites based on high-density polyethylene (HDPE) and linear-low density polyethylene (LLDPE) blends with PANI were prepared in molten condition using a torque rheometer. The effect of compatibilizer agent (maleic anhydride-grafted high density polyethylene, HDPE-g-MA) and different contents of PANI on the blends-based composites was also investigated. Thermal, mechanical, and electromagnetic (electric permittivity) measurements and morphological aspects of the composites were evaluated. The addition of PANI content in the composites decreases the degree of crystallinity of HDPE and LLDPE blends, which implies that PANI particles make it difficult for co-crystallization to occur in the HDPE and LLDPE, respectively. On the other hand, the addition of compatibilizer agent in the HDPE and LLDPE blends increased the degree of crystallinity. The complex parameters of permittivity in the frequency range of 8.2 to 12.4 GHz varied as a function of the PANI content in the blend. It was also observed that the compatibilizer agent increased the composite stiffness and decreased the electric permittivity values. This result shows that the increasing rigidity of the molecular structure of the polyethylene matrix hindered the dissipation of the electromagnetic energy in the sample.
Highlights
The electrically insulating and non-magnetic nature of polymers can be modified by the introduction of conducting and/or magnetic fillers into the polymers[1]
In our previous work[23], we studied the effect of the addition of PANI in linear-low density polyethylene (LLDPE) and observed an improvement in the electrical conductivity with the addition of PANI
The PANI does not melt in these processing conditions and the molten high-density polyethylene (HDPE)/ LLDPE matrix involved the polyaniline particles during the processing
Summary
The electrically insulating and non-magnetic nature of polymers can be modified by the introduction of conducting and/or magnetic fillers into the polymers[1]. A PANI-DBSA complex can be blended with polyolefin matrices (polyethylene or polypropylene) in molten state. These polymer blends can be molded into antistatic or conductive films or even spun into fibers with a melt spinning technique[12,13]. Aiming to understand the effect of the branching of the polyethylene chain and the effect of the addition of compatibilizer agent on the electromagnetic properties, the purpose of this work is to obtain composites based on blends of HDPE and. PANI was synthesized by the protonation method with HCl. The thermal, mechanical, morphological, and electromagnetic (8.2-12.4 GHz) properties of the HDPE/LLDPE/PANI blends with different contents of PANI were studied and correlated
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