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Components of partially bioavailable polyurethane
Release time:
2023-09-09
Biostable and biodegradable polyurethanes are at opposite ends of the polyurethane spectrum and demonstrate the versatility of this large class of materials.
Comparison with Biostable Analogues
Improvements in the biostability of polyurethanes have centred on the reduction or elimination of soft chain segments that are predominantly ester or ether bonded reactive sites. In this regard, polycarbonate diols show significant stability over these predecessors and exhibit oxidative and hydrolytic stability in accelerated testing. As mentioned earlier, increasing the concentration of hard chain segments decreases the number of sites available for reactive degradation and increases the hydrophobicity of the polymer. Polyether-urethane (PEU) 80A has a hardness value lower than 55D, compared to which the oxidative stability of the 80A sample is lower. Predictably, the oxidative stability of both PEUs was lower than that of the polyurethane containing polycarbonate.
Further improvements in stability are aimed at completely eliminating oxygen from the soft chain segments by generating polyols that are resistant to oxidation and hydrolysis. The preparation of polyisobutylene diols (PIBd) as well as polyurethanes containing soft chain segments and multiblock prepolymers has been studied extensively by researchers. Polyurethanes with soft chain segments made from dihydroxypolyisobutylene have been compared to polyurethanes containing polyether, polycarbonate and silicone polycarbonate polyurethane elastomers. Mechanical properties, hydrolytic and oxidative stability were reported to be superior to those of the comparison materials. Their use in biomedical applications has been mentioned several times. To date, there is just a lack of suppliers of polyurethane-grade PIB polyols, limiting their use in biomedical polyurethane applications.
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