Polydimethylsiloxane/polyether-mixed macrodiol-based polyurethane elastomers: biostability.
A series of four thermoplastic polyurethane elastomers were synthesized with varying proportions of poly(hexamethylene oxide) (PHMO) and poly(dimethylsiloxane) (PDMS) macrodiols. The macrodiol ratios (by weight) employed were (% PDMS:% PHMO) 100:0, 80:20, 50:50 and 20:80. The weight fraction of macrodiol in each polymer was fixed at 60%. The mixed macrodiols were reacted with 4,4'-methylenediphenyl diisocyanate (MDI) and 1,4-butanediol (BDO) chain extender. The biostability of these polymers was assessed by strained subcutaneous implantation in sheep for three months followed by microscopic examination. Pellethane 2363-80A and 2363-55D were employed as control materials. The mechanical properties of the polymers were tested and discussed along with the biostability results. The results showed that soft, flexible PDMS-based polyurethanes with very promising biostability can be successfully produced using the mixed macrodiol approach. The formulation with 80% PDMS macrodiol produced the best result in terms of a combination of flexibility, strength and biostability.
Martin
D J
DJ
The Cooperative Research Centre For Cardiac Technology, University of New South Wales, Graduate School of Biomedical Engineering, Sydney, Australia.
Warren
L A
LA
Gunatillake
P A
PA
McCarthy
S J
SJ
Meijs
G F
GF
Schindhelm
K
K
D001672:Biocompatible Materials / Q000138:chemical synthesis / Q000737:chemistry*; D004129:Dimethylpolysiloxanes / Q000737:chemistry*; D004355:Drug Stability; D004548:Elasticity; D008855:Microscopy, Electron, Scanning; D011140:Polyurethanes / Q000138:chemical synthesis / Q000737:chemistry*; D012828:Silicones / Q000737:chemistry*; D013718:Tensile Strength
D001672:Biocompatible Materials; D004129:Dimethylpolysiloxanes; D011140:Polyurethanes; D012828:Silicones; C090631:polyhexamethylene oxide; C013830:baysilon