Next Article in Journal
The Influence of Synthesis Parameters on Particle Size and Photoluminescence Characteristics of Ligand Capped Tb3+:LaF3
Next Article in Special Issue
Mechanisms of Light Energy Harvesting in Dendrimers and Hyperbranched Polymers
Previous Article in Journal
Role of Antimicrobial Peptides in Inflammatory Bowel Disease
Previous Article in Special Issue
NMR Studies and Molecular Dynamic Simulation of Synthetic Dendritic Antigens
Polymers 2011, 3(4), 2018-2038; doi:10.3390/polym3042018
Article

Incorporation of Hyperbranched Supramolecules into Nafion Ionic Domains via Impregnation and In-Situ Photopolymerization

1
, 1,* , 2
, 2
, 3
, 3
 and 3
Received: 1 October 2011; in revised form: 1 November 2011 / Accepted: 18 November 2011 / Published: 28 November 2011
(This article belongs to the Special Issue Dendrimers and Hyperbranched Polymers)
View Full-Text   |   Download PDF [1091 KB, uploaded 28 November 2011]   |   Browse Figures
Abstract: Nafion membranes were impregnated with photocurable supramolecules, viz., hyperbranched polyester having pendant functional carboxylic acid groups (HBPEAc-COOH) by swelling in methanol and subsequently photocured in-situ after drying. Structure-property relationships of the HBPEAc-COOH impregnated Nafion membranes were analyzed on the basis of Fourier transform infrared (FTIR) spectroscopy, solid-state nuclear magnetic resonance (SSNMR) and dynamic mechanical analysis (DMA). FTIR and SSNMR investigations revealed that about 7 wt % of HBPEAc-COOH was actually incorporated into the ionic domains of Nafion. The FTIR study suggests possible complexation via inter-species hydrogen bonding between the carboxylic groups of HBPEAc-COOH and the sulfonate groups of Nafion. The α-relaxation peak corresponding to the glass transition temperature of the ionic domains of the neat Nafion-acid form was found to increase from ~100 to ~130 °C upon impregnation with enhanced modulus afforded by the cured polyester network within the ionic domains. The AC impedance fuel cell measurement of the impregnated membrane exhibited an increasing trend of proton conductivity with increasing temperature, which eventually surpassed that of neat Nafion above 100 °C. Of particular importance is that the present paper is the first to successfully incorporate polymer molecules/networks into the Nafion ionic domains by means of impregnation with hyperbranched supramolecules followed by in-situ photopolymerization.
Keywords: Nafion; hyperbranched polyester; impregnation; proton conductivity Nafion; hyperbranched polyester; impregnation; proton conductivity
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Export to BibTeX |
EndNote


MDPI and ACS Style

Nazir, N.A.; Kyu, T.; Reinsel, A.M.; Espe, M.; Nosaka, M.; Kudo, H.; Nishikubo, T. Incorporation of Hyperbranched Supramolecules into Nafion Ionic Domains via Impregnation and In-Situ Photopolymerization. Polymers 2011, 3, 2018-2038.

AMA Style

Nazir NA, Kyu T, Reinsel AM, Espe M, Nosaka M, Kudo H, Nishikubo T. Incorporation of Hyperbranched Supramolecules into Nafion Ionic Domains via Impregnation and In-Situ Photopolymerization. Polymers. 2011; 3(4):2018-2038.

Chicago/Turabian Style

Nazir, Nadzrinahamin A.; Kyu, Thein; Reinsel, Anna M.; Espe, Matthew; Nosaka, Mami; Kudo, Hiruto; Nishikubo, Tadatomi. 2011. "Incorporation of Hyperbranched Supramolecules into Nafion Ionic Domains via Impregnation and In-Situ Photopolymerization." Polymers 3, no. 4: 2018-2038.


Polymers EISSN 2073-4360 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert