# Comprehensive studies on sulfonated octaphenyl polyhedral silsesquioxane (SPOSS) using sulfuric acid: Structural analysis and composite crosslinked SPPSU/SPOSS membranes

https://mdr.nims.go.jp/datasets/60b088db-2777-4ceb-a87c-8d5dc52043b8

## File

- [20240324 REVISED MANUSCRIPT CLEAN2 (J. Membr. Sci.).pdf](https://mdr.nims.go.jp/filesets/93525791-6647-4c44-ba42-a035276fd9b8/download) ([Detail](https://mdr.nims.go.jp/filesets/93525791-6647-4c44-ba42-a035276fd9b8.md))

## Id

60b088db-2777-4ceb-a87c-8d5dc52043b8

## Local identifier



## Visibility

open_to_public

## State

published

## Created at

2024-04-24T01:51:55.672582Z

## Updated at

2024-04-24T07:42:19.574707Z

## Published at

2026-04-08T23:25:03.564559Z

## Doi

https://doi.org/10.48505/nims.4490

## First published url

https://doi.org/10.1016/j.memsci.2024.122756

## Date published

2024-04-08

## Recorded date published

2024-5

## Resource type

journal_article

## Manuscript type

accepted_manuscript

## Collection



## Title

- title: 'Comprehensive studies on sulfonated octaphenyl polyhedral silsesquioxane
    (SPOSS) using sulfuric acid: Structural analysis and composite crosslinked SPPSU/SPOSS
    membranes'
  title_type: original
  lang: en

## Description

- description: We prepared sulfonated octaphenyl polyhedral silsesquioxane (SPOSS)
    with its structure intact by using sulfuric acid (H2SO4) at 40 °C. We discussed
    the effects of sulfonation using either chlorosulfonic acid (ClSO3H) and H2SO4
    on SPOSS structure and its incorporation into crosslinked sulfonated olyphenylsulfone
    (CSPPSU) composite polymer electrolyte membranes (PEM). An in-depth structural
    characterization using 29Si NMR and FTIR spectroscopies, MALDI-TOF mass spectrometry,
    and TGA show that phenyl loss occurred in SPOSS prepared using ClSO3H, resulting
    in a low ion exchange capacity (IEC) of 1.7 meq/g and a sulfonation degree (DS)
    of 1.9. In contrast, the phenyl remained intact in the SPOSS prepared using H2SO4.
    Well-dispersed 348-nm-SPOSS-H2SO4 was found to have an IEC of 2.4 meq/g and DS
    of 3.1. The resultant hybrid PEM of CSPPSU/SPOSS using SPOSSH2SO4 had improved
    swelling, mechanical and chemical strength, and conductivity. 1 wt% SPOSS-H2SO4
    loading had the highest conductivity (13.7 mS/cm) at 120 °C with 40 % RH. This
    shows the importance of the SPOSS nanocomposite structure in dispersions in the
    SPPSU polymer matrix and its performance as PEM. We report on an improved direct
    sulfonation process at a milder condition but sulfonation yield was improved.
  description_type: abstract
  lang: und

## Creator

- name: Fatin Bazilah Fauzi
  role: author
- name: Je-Deok Kim
  role: author
  orcid: https://orcid.org/0000-0003-2442-1013

## Contact agent



## Publisher

organization: Elsevier BV

## Managing organization



## Keyword

- subject: Polymer electrolyte membrane
  schema: not_defined
- subject: Sulfonated octaphenyl polyhedral oligomeric silesquioxane
  schema: not_defined
- subject: Nanocomposite
  schema: not_defined
- subject: Crosslinked SPPSU/SPOSS membrane
  schema: not_defined

## Rights

- identifier: https://creativecommons.org/licenses/by-nc-nd/4.0/

## Other identifier(s)



## Data origin

- data_origin_type: other

## Embargo

start_date: 2024-04-08
end_date: 2026-04-09

## Journal

- title: Journal of Membrane Science
  issn: '03767388'
  volume: '702'
  article_number: '122756'

## Conference



## Related item



## Funding

- funder_name: National Institute for Materials Science
- funder_name: New Energy and Industrial Technology Development Organization

## Instrument



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## Measurement method



## Specimen



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## Structure for specimen



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## Fileset

- id: 93525791-6647-4c44-ba42-a035276fd9b8
  filename: 20240324 REVISED MANUSCRIPT CLEAN2 (J. Membr. Sci.).pdf
  content_type: application/pdf
  size: 2010657
  md5: cbd65b49aa953729a0229b3fd5a318df

## Thumbnail

fileset_id: 93525791-6647-4c44-ba42-a035276fd9b8
filename: 20240324 REVISED MANUSCRIPT CLEAN2 (J. Membr. Sci.).pdf