Absorbable polymers evolution

In addition to ester-based polyesters, a great deal of research activity has been directed to other types of absorbable polymers, but the clinical relevance of their properties practically halted their evolution beyond the exploratory phase. Typical examples of these polymers have been covered in a review by Shalaby and include those based on polyanhydrides, polyortiioesters, poly-phosphazenes, and certain polyamidoesters. ... 

Evolution in the Use of Synthetic Absorbable Polymers for Vascular Grafts and Patches... 

The development of conductive polymer based micro-wave absorbing materials implies the knowledge of radioelectrical characteristics of these compounds, in terms of level and frequency evolution. The need to associate a theoretical approach with our experimental process appears very early, allowing us to optimise the use of some materials. The later approach, based on the description of the phenomena in term of electrical modulus permits us to obtain important results. The correlation of the relaxation frequency with the level of... 

We have already observed that the physico-chemical and structural specific properties of conducting polymers influence the evolution of their microwave properties. The problem is now to design a conducting polymer-based absorbing material. 

Technology Evolution of Absorbable/Biodegradable Polymers as Materials... 

Based on the design criteria noted above, the evolution of the absorbable cyanoacrylate-based system commenced with methoxypropyl cyanoacrylate (MFC) and was followed by formulation of MFC with polyether oxalate or polyester carbonate. Figure 5.1 outlines a polymerization scheme and designation of the final polymer. Both V-100 and V-150 tissue adhesives contain the same components but in different proportions. 

This course of the process seems to be rather common in the dissolution of linear polymers, thot h few examples have been accurately studied. Already as early as 1885 Wiedemann and LiiDECKE, Ann, d. Phys. u. Chemie, N. F. 25 (1885), 145 reported that the first amounts of water absorbed by gelatin give rise to evolution of heat, but that, upon further dilution, heat is absorbed. 3 T. Petitpas, /. chim. phys, 37 (1940), 6,... 

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