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By James N. Pitts, etc.

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For bioadhesive applications, anionic polymers appear to provide the most effective balance between adhesiveness and toxicity, with carboxylic materials preferred over sulfonic polymers [400]. Poly(acrylic acid) microparticles have been identified as particularly effective bioadhesive materials [402]. Studies with poly(acrylic acid) microparticles have indicated that, while water-swollen particles exhibit good bioadhesion, dry polymer particles give no adhesion at all. In addition, adhesive strength increases as the degree of ionization of the polymer is increased [402].

It was concluded that the indomethacin release from these systems was dependent upon the biodégradation action of the caecal content. Responsive polyelectrolyte hydrogels that have been used for controlled release systems include gels which are hydrophobic in their neutral state Biomedical Applications of Polyelectrolytes 27 [319-321] and acrylic copolymer gels based on hydroxyethyl methacrylate [322]. For instance, hydrophobically modified poly(acrylic acid) has been synthesized by radical copolymerization of acrylic acid with varying amounts of butyl acrylate and crosslinker, giving pH dependent hydrogels [323].

5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. 17. 18. 19. 20. 21. 22. 23. 24. 25. 26. 27. 28. Odian G (1991) Principles of polymerization, 3rd edn. Wiley, New York Rodrigues F (1982) Principles of polymer systems, 2nd edn. McGraw-Hill, New York Billmeyer FW (1984) Textbook of polymer science, 3rd edn. Wiley, New York Yin YL, Prud'homme RK, Stanley F (1992). In: Harland RS, Prud'homme RK (eds) Polyelectrolyte gels, ACS Symposium Series 480. American Chemical Society, Washington DC, p 91 Buchholz FL (1990).

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