Duangkamol Promlok, Waraporn Wichaita, Suttinun Phongtamrug, Chariya Kaewsaneha, Paiboon Sreearunothai, Teeraporn Suteewong,* Pramuan Tangboriboonrat,*

Hollow magnetic (HoM) polyaniline (PANI) particles, that can be incorporated in coatings, for electromagnetic (EM)/ultraviolet-visible-near infrared (UV-Vis-NIR) shielding were fabricated via the oxidative polymerization in emulsion system. By using ethyl benzene (Eb) as a soft template, and different surfactive dopants, i.e., sodium dodecyl sulfate, sodium dodecylbenzene sulfonate, and poly(sodium 4-styrenesulfonate) (PSS), the HoM-PANI particles (0.5-2 μm) with well-defined hollow structure, high magnetic loading (17-21%wt), and superparamagnetic properties were obtained in one-pot. PSS with molecular weight of 70 K and 1 M yielded the larger HoM-PANI particles, and more opaque films than small dopant molecules. Void size was the determining effect on excellent opacity of the coating containing HoM-PANI dispersed in poly(vinyl alcohol) matrix against UV-Vis-NIR, and EM radiation. These HoM-PANI particles with tunable conductivity, magnetic properties, and void structure were of great interest for new generation of hybrid fillers for water-based coating and UV-Vis-NIR/EMI shielding applications.

This research has received funding support from the NSRF via the Program Management Unit for Human Resources & Institutional Development, Research and Innovation [grant number B05F640078].