References

Hernández, Carlos Felipe Rodríguez

doi:10.4000/books.uec.1519

Cited by 1 publication

(1 citation statement)

References 14 publications

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“…[2][3][4][5] However, for certain applications stabilization of self-assembled structures via covalent crosslinking is desired. The most prominent methods employed for the covalent crosslinking of micellar structures are: the incorporation of a polymerizable 6,7 or photo/UV crosslinkable group [8][9][10][11][12] and the introduction of crosslinking reagents (e.g. diamines).…”

Section: Introductionmentioning

confidence: 99%

UV‐induced crosslinking of ring opening metathesis block copolymer micelles

Sandholzer

Bichler

Stelzer

et al. 2008

J. Polym. Sci. A Polym. Chem.

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Statistical and amphiphilic block copolymers bearing cinnamoyl groups were prepared by ring opening metathesis polymerization (ROMP). The UV‐induced [2 + 2] cycloaddition reaction of polymer bound cinnamic acid groups was studied in polymer thin films as well as in block copolymer micelles. In both cases, exposure to UV‐light for 10 min led to a crosslinking conversion of about 60%, as determined by FT‐IR spectroscopy and UV–vis absorption measurements. Time based IR‐spectroscopy revealed a maximum conversion of 78% reached after an irradiation time of about 16 min. For micelles obtained from polymers bearing 5 mol % or more cinnamoyl groups, the crosslinking reaction proceeded smoothly, yielding in crosslinked particles which were stable in a non‐selective solvent (CHCl3). Diameters determined by dynamic light scattering in the selective solvent (MeOH) were similar for both, non‐crosslinked and crosslinked micelles, whereas diameters of crosslinked micelles in the non‐selective solvent (CHCl3) were significantly larger compared to MeOH samples. This strategy of direct self assembly of block‐copolymers in a selective solvent followed by “clean” crosslinking, without the need for additional crosslinking reagents or crosslinking initiators, provides a straight forward approach toward ROMP‐based polymeric nano‐particles. © 2008 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 46: 2402–2413, 2008

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