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By El Sayed H. El Ashry and Ahmed A. Kassem

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Extra resources for Account of microwave irradiation for accelerating organic reactions

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The amorphous polymeric, polyaxial initiators (PPIs) used in these systems to produce crystalline absorbable copolymeric materials can be made by reacting a cyclic monomer or a mixture of cyclic monomers such as trimethylene carbonate, caprolactone, and 1,5-dioxapane-2-one in the presence of an organometallic catalyst with one or more polyhydroxy, polyamino, or hydroxyamino compounds having three or more reactive amines and/or hydroxyl groups. Typical examples of the latter compounds are glycerol and ethane-trimethylol, propane-trimethylol, pentaerythritol, triethanolamine, and N-2-aminoethyl-1,3-propanediamine.

Such polymers have been developed for use as surgical sutures, carriers for the controlled release of bioactive agents, and compliant absorbable tissue adhesives/sealants. Polyethylene glycol (PEG) has been noted for being a biocompatible, nontoxic, nonimmunogenic, and water soluble material for use in pharmaceutical and biomedical applications. 5 This led to the development of a novel family of absorbable copolyesters comprising liquid, hydrogel-forming, solid thermoplastic or photopolymerizable materials.

4,605,730, 1986. 5. Shalaby, S. W. and Jamiolkowski, D. S. ) 4,700,704, 1987. 6. Casey, D. J. and Roby, M. S. S. ) 4,429,900, 1984. 7. Shalaby, S. S. ) 6,342,065, 2002. 24 Absorbable and Biodegradable Polymers 8. Carpenter, K. , Anneaux, B. , Shalaby, W. , Pilgrim, J. , Linden, D. , Quirk, J. R. and Shalaby, S. , Segmented lactide copolymers as monofilament sutures — A preliminary report, Trans. Soc. , 25, 660, 2002. 9. Burg, K. J. L. and Shalaby, S. , Absorbable materials and pertinent devices, in Handbook of Biomaterials Evaluation: Scientific, Technical, and Clinical Testing of Implant Materials, 2nd ed, von Recum, A.

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