The influence of composition ratio on the morphology of biomedical polyurethanes

Martin, Darren J., Meijs, Gordon F., Gunatillake, Pathiraja A., Yozghatlian, Setrig P. and Renwick, Gordon M. (1999) The influence of composition ratio on the morphology of biomedical polyurethanes. Journal of Applied Polymer Science, 71 6: 937-952. doi:10.1002/(SICI)1097-4628(19990207)71:6<937::AID-APP9>3.0.CO;2-0


Author Martin, Darren J.
Meijs, Gordon F.
Gunatillake, Pathiraja A.
Yozghatlian, Setrig P.
Renwick, Gordon M.
Title The influence of composition ratio on the morphology of biomedical polyurethanes
Journal name Journal of Applied Polymer Science   Check publisher's open access policy
ISSN 0021-8995
1097-4628
Publication date 1999-02-07
Sub-type Article (original research)
DOI 10.1002/(SICI)1097-4628(19990207)71:6<937::AID-APP9>3.0.CO;2-0
Volume 71
Issue 6
Start page 937
End page 952
Total pages 16
Place of publication Hoboken, NJ, United States
Publisher John Wiley & Sons
Language eng
Formatted abstract
Two series of thermoplastic polyurethane elastomers were synthesized from 4,4′-methylenediphenyl diisocyanate (MDI), 1,4-butanediol (BDO) chain extender, and each of poly(tetramethylene oxide) (PTMO) and poly(hexamethylene oxide) (PHMO) macrodiols. The PTMO and PHMO molecular weights were kept constant at 993 and 852 g/mol, respectively. In the PTMO-based series, the composition ratio was varied between 48 and 58% (w/w) of macrodiol; 2 commercially available PTMO-based polymers were also included. These were Pellethane 2363 80A® and its harder counterpart, Pellethane 2363 55D®. In the PHMO-based series, the composition ratio was varied between 50 and 60% (w/w) of macrodiol. The materials were characterized by differential scanning calorimetry (DSC), dynamic mechanical thermal analysis (DMTA), wide-angle X-ray diffraction (WAXD), and small-angle X-ray scattering (SAXS). Mechanical performance was also assessed by tensile testing, stress hysteresis, and hardness testing. Altering the composition ratio had a similar effect on morphology and properties for both the PTMO and PHMO-based series. An increase in hard segment content was associated with increased hard microdomain crystallinity, hardness, and stiffness. In both series, he beginning of hard microdomain interconnectivity was observed at a composition ratio of 52% soft segment. That is to say, for the processing and annealing conditions employed, macrodiol contents of 52% and below began to produce continuous, rather than discrete, hard microdomains. Pellethane 80A® was shown to have a discrete hard microdomain morphology, while Pellethane 55D® was shown to incorporate interconnecting hard microdomains. It is suggested that the superior biostability performance of Pellethane 55D relative to Pellethane 80A may be related to its interconnecting hard microdomain texture.
Keyword Pellethane
Degradation
Morphology
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collection: Australian Institute for Bioengineering and Nanotechnology Publications
 
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Created: Tue, 01 Oct 2013, 15:09:08 EST by Cathy Fouhy on behalf of Aust Institute for Bioengineering & Nanotechnology