Next Article in Journal
Development of a Highly Proliferated Bilayer Coating on 316L Stainless Steel Implants
Next Article in Special Issue
Synthesis of Phosphorus-Containing Polyanilines by Electrochemical Copolymerization
Previous Article in Journal
Electrospinning of Cellulose Nanocrystal-Reinforced Polyurethane Fibrous Mats
Previous Article in Special Issue
Polyaniline Based Pt-Electrocatalyst for a Proton Exchanged Membrane Fuel Cell
Open AccessArticle

Synthesis and Characterization of Hollow-Sphered Poly(N-methyaniline) for Enhanced Electrical Conductivity Based on the Anionic Surfactant Templates and Doping

1
The Conductive and Electroactive Polymer Research Unit, The Petroleum and Petrochemical College, Chulalongkorn University, Bangkok 10330, Thailand
2
Center of Excellence on Petrochemical and Materials Technology (PETROMAT), Chulalongkorn University Research Building, Soi Chula 12, Phayathai Road, Bangkok 10330, Thailand
*
Author to whom correspondence should be addressed.
Polymers 2020, 12(5), 1023; https://doi.org/10.3390/polym12051023
Received: 24 March 2020 / Revised: 17 April 2020 / Accepted: 18 April 2020 / Published: 1 May 2020
(This article belongs to the Special Issue Functional and Conductive Polymer Thin Films I)
Poly(N-methylaniline) (PNMA) is a polyaniline derivative with a methyl substituent on the nitrogen atom. PNMA is of interest owing to its higher solubility in organic solvents when compared to the unsubstituted polyaniline. However, the electrical conductivity of polyaniline derivatives suffers from chemical substitution. PNMA was synthesized via emulsion polymerization using three different anionic surfactants, namely sodium dodecylsulfate (SDS), sodium dodecylbenzenesulfonate (SDBS), and dioctyl sodium sulfosuccinate (AOT). The effects of surfactant structures and concentrations on electrical conductivity, doping level, crystallinity, morphology, and thermal stability were investigated. The re-doping step using perchloric acid (HClO4) as a dopant was sequentially proceeded to enhance electrical conductivity. PNMA synthesized in SDBS at five times its critical micelle concentration (CMC) demonstrated the highest electrical conductivity, doping level, and thermal stability among all surfactants at identical concentrations. Scanning electron microscopy (SEM) images revealed that the PNMA particle shapes and sizes critically depended on the surfactant types and concentrations, and the doping mole ratios in the re-doping step. The highest electrical conductivity of 109.84 ± 20.44 S cm−1 and a doping level of 52.45% were attained at the doping mole ratio of 50:1. View Full-Text
Keywords: poly(N-methylaniline); anionic surfactant; surfactant concentration; electrical conductivity; the doping process poly(N-methylaniline); anionic surfactant; surfactant concentration; electrical conductivity; the doping process
Show Figures

Graphical abstract

MDPI and ACS Style

Direksilp, C.; Sirivat, A. Synthesis and Characterization of Hollow-Sphered Poly(N-methyaniline) for Enhanced Electrical Conductivity Based on the Anionic Surfactant Templates and Doping. Polymers 2020, 12, 1023.

Show more citation formats Show less citations formats
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

1
Search more from Scilit
 
Search
Back to TopTop