Sequential homo-interpenetrating polymer networks of poly(2-hydroxyethyl methacrylate): synthesis, characterization, and calcium uptake

Chirila, Traian V., George, Karina A., Abdul Ghafor, Wael A., Pas, Steven J. and Hill, Anita J. (2012) Sequential homo-interpenetrating polymer networks of poly(2-hydroxyethyl methacrylate): synthesis, characterization, and calcium uptake. Journal of Applied Polymer Science, 126 Supp. 2: E455-E466. doi:10.1002/app.36824


Author Chirila, Traian V.
George, Karina A.
Abdul Ghafor, Wael A.
Pas, Steven J.
Hill, Anita J.
Title Sequential homo-interpenetrating polymer networks of poly(2-hydroxyethyl methacrylate): synthesis, characterization, and calcium uptake
Journal name Journal of Applied Polymer Science   Check publisher's open access policy
ISSN 0021-8995
1097-4628
Publication date 2012-11-25
Sub-type Article (original research)
DOI 10.1002/app.36824
Open Access Status Not Open Access
Volume 126
Issue Supp. 2
Start page E455
End page E466
Total pages 12
Place of publication Hoboken, NJ, United States
Publisher John Wiley & Sons
Language eng
Abstract Formation of homo-interpenetrating polymer networks (homo-IPNs) of poly(2-hydroxyethyl methacrylate) (PHEMA) and their capacity for calcification are investigated. A sequential method is established to generate IPNs of rank I and II, containing two or three crosslinked networks. Although the networks are chemically identical, thermo-mechanical analysis (DSC, DMA) suggests some phase separation. Calcification of PHEMA hydrogels, thought to be controlled by the free volume pathways accessible to calcium ions, is investigated by positron annihilation lifetime spectroscopy (PALS) and experimental calcium deposition. While calcium uptake is reduced in IPNs, the size of the free volume elements estimated by PALS remain constant at radii of 2.6 Å (dry) and 2.9 Å (hydrated), both in PHEMA and IPNs. The reduction of calcium uptake cannot be therefore associated with the size reduction of the angstrom-size free volume elements detectable by PALS, and is attributed to the effect of chain packing on pores too large to be detected by PALS.
Keyword Interpenetrating networks (IPN)
Hydrogels
PHEMA
Glass transition
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ

 
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