Polyaxial polymeric initiators, crystalline

Using polyaxial polymeric initiators on the thermal properties of crystalline end-grafted products as compared with those having linear molecules... 

Segmented copolymers geared for the production of compliant monofilament sutures described in Chapter 3 dealt with the use of end-grafting of an amorphous, or low melting, polyaxial polymeric initiator with cyclic monomers to form crystalline end-grafts. In this particular chain design, the... 

Shalaby, S. W., Amorphous Polymeric Polyaxial Initiators and Compliant Crystalline Copolymers Thereof, U.S. Patent (to Poly-Med, Inc.), 6,462,169, 2002. 

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 l,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-l,3-propanediamine. 

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