|
authors |
Vilela, C; Gadim, TDO; Silvestre, AJD; Freire, CSR; Figueiredo, FML |
|
nationality |
International |
|
journal |
CELLULOSE |
|
author keywords |
Bacterial cellulose; Nanostructured composites; Poly(methacryloyloxyethyl phosphate); Mechanical and thermal properties; Protonic conductivity |
|
keywords |
BACTERIAL CELLULOSE MEMBRANES; FUEL-CELL APPLICATIONS; MICROBIAL CELLULOSE; CONDUCTIVITY; TEMPERATURE; COPOLYMERS; CHITOSAN; SORPTION; PEMFCS; ACID |
|
abstract |
The present study discloses a new type of nanocomposite membranes consisting of cross-linked poly(methacryloyloxyethyl phosphate) (PMOEP) and bacterial cellulose (BC) prepared by the in situ free radical polymerization of MOEP within the BC network under green reaction conditions. Homogeneous and translucent PMOEP/BC nanocomposite membranes with 52, 61 and 78 wt% of BC have good thermal and viscoelastic stability up to 180 A degrees C with storage modulus higher than 200 MPa, good mechanical properties (Young's modulus = 7.8-13.5 GPa), and high ion exchange capacity (1.95-3.38 mmol [H+] g(-1)). The protonic conductivity of these nanocomposite membranes increases with increasing PMOEP content and relative humidity (RH), reaching values higher than 0.1 S cm(-1) at 98 % RH, with activation energy close to 15 kJ mol(-1), from room temperature up to 94 A degrees C. These values are comparable to, or higher than, data typically found for a commercial Nafion(A (R)) membrane, further confirming the potential of these proton separator materials as a green alternative for application in fuel cells. |
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publisher |
SPRINGER |
|
issn |
0969-0239 |
|
year published |
2016 |
|
volume |
23 |
|
issue |
6 |
|
beginning page |
3677 |
|
ending page |
3689 |
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digital object identifier (doi) |
10.1007/s10570-016-1050-7 |
|
web of science category |
Materials Science, Paper & Wood; Materials Science, Textiles; Polymer Science |
|
subject category |
Materials Science; Polymer Science |
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unique article identifier |
WOS:000388961200024
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