Synthesis and characterization of the swelling and mechanical properties of amphiphilic ionizable model co-networks containing n-butyl methacrylate hydrophobic blocks
Soft Matter, ISSN: 1744-6848, Vol: 4, Issue: 2, Page: 268-null
2008
- 36Citations
- 10Captures
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Metrics Details
- Citations36
- Citation Indexes36
- 36
- CrossRef33
- Captures10
- Readers10
- 10
Article Description
Amphiphilic ionizable model co-networks based on near-monodisperse, linear ABA and BAB triblock and statistical copolymers of 2-(dimethylamino)ethyl methacrylate (DMAEMA, hydrophilic ionizable) and n-butyl methacrylate (BuMA, hydrophobic non-ionic) were synthesized using group-transfer polymerization in tetrahydrofuran (THF) with the use of the hydrophobic ethylene glycol dimethacrylate (EGDMA) as cross-linker. Seven model co-networks were prepared in which the architecture and copolymer composition were varied systematically. One randomly cross-linked copolymer co-network was also prepared. The co-networks were characterized in terms of their degree of swelling in water as a function of pH and in THF. An increase in the aqueous degree of swelling was observed below pH 6 because of the ionization of the DMAEMA residues. The aqueous degrees of swelling at low pH decreased with the co-network composition in hydrophobic BuMA units. The maximum aqueous degrees of swelling of the copolymer co-networks were architecture-dependent, with the co-networks comprising the statistical copolymer chains swelling about 4 times more than their triblock copolymer counterparts. This was attributed to microphase separation in the triblock copolymer co-networks, which reduced the effective chain length between cross-links due to the collapse of the hydrophobic blocks. The mechanical properties of the water-swollen co-networks at pH 3 and 9 were investigated by determining the co-network uniaxial compression modulus. This modulus was higher at pH 9 than 3, and increased linearly with the BuMA content. © The Royal Society of Chemistry.
Bibliographic Details
http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=38349192237&origin=inward; http://dx.doi.org/10.1039/b710926a; http://www.ncbi.nlm.nih.gov/pubmed/32907240; https://xlink.rsc.org/?DOI=B710926A; http://xlink.rsc.org/?DOI=B710926A; http://pubs.rsc.org/en/content/articlepdf/2008/SM/B710926A; https://dx.doi.org/10.1039/b710926a; https://pubs.rsc.org/en/content/articlelanding/2008/sm/b710926a
Royal Society of Chemistry (RSC)
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