Effect of chain extender structure on the properties and morphology of polyurethanes based on H12MDI and mixed macrodiols (PDMS-PHMO)

Raju Adhikari, Pathiraja A. Gunatillake, Simon McCarthy, Gordon F. Meijs

Research output: Contribution to journalArticle

32 Citations (Scopus)

Abstract

The effect of chain extender structure on properties and morphology of α,ω-bis(6-hydroxyethoxypropyl) polydimethylsiloxane (PDMS) and poly(hexamethylene oxide) (PHMO) mixed macrodiol-based aliphatic polyurethane elastomers was investigated using tensile testing, differential scanning calorimetry (DSC), and dynamic mechanical thermal analysis (DMTA). All polyurethanes were based on 50 wt% of hard segment derived from 4,4′-methylenecyclohexyl diisocyanate (H12MDI) and a chain extender mixture. 1,4-Butanediol was the primary chain extender, while one of 1,3-bis(4-hydroxybutyl)tetramethyldisiloxane (BHTD), 1,3-bis(3-hydroxypropyl)tetramethyldisiloxane (BPTD), hydroquinonebis(2-hydroxyethyl)ether (HQHE), 1,3-bis(3-hydroxypropyl)tetramethyldisilylethylene (HTDE), or 2,2,3,3,4,4-hexafluoro-1,5-pentanediol (HFPD) each was used as a secondary chain extender. Two series of polyurethanes containing 80:20 (Series A) and 60:40 (Series B) molar ratios of primary and secondary chain extenders were prepared using one-step bulk polymerization. All polyurethanes were clear and transparent and had number-average molecular weights between 56,000 and 122,100. Incorporation of the secondary chain extender resulted in polyurethanes with low flexural modulus and high elongation. Good ultimate tensile strength was achieved in most cases. DSC and DMTA analyses showed that the incorporation of a secondary chain extender disrupted the hard segment order in all cases. The highest disruption was observed with HFPD, while the silicon-based chain extenders gave less disruption, particularly in Series A. Further, the silicon chain extenders improved the compatibility of the PDMS soft segment phase with the hard segment, whereas with HFPD and HQHE, this was not observed.

Original languageEnglish (US)
Pages (from-to)2979-2989
Number of pages11
JournalJournal of Applied Polymer Science
Volume74
Issue number12
DOIs
StatePublished - Jan 1 1999
Externally publishedYes

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Polyurethanes
Polydimethylsiloxane
Oxides
Silicon
Ether
Thermoanalysis
Differential scanning calorimetry
Ethers
Elastomers
Tensile testing
Elongation
Tensile strength
Molecular weight
Polymerization
polyhexamethylene oxide
baysilon
4,4'-methylene dicyclohexyl diisocyanate
1,5-pentanediol

ASJC Scopus subject areas

  • Polymers and Plastics

Cite this

Effect of chain extender structure on the properties and morphology of polyurethanes based on H12MDI and mixed macrodiols (PDMS-PHMO). / Adhikari, Raju; Gunatillake, Pathiraja A.; McCarthy, Simon; Meijs, Gordon F.

In: Journal of Applied Polymer Science, Vol. 74, No. 12, 01.01.1999, p. 2979-2989.

Research output: Contribution to journalArticle

Adhikari, Raju ; Gunatillake, Pathiraja A. ; McCarthy, Simon ; Meijs, Gordon F. / Effect of chain extender structure on the properties and morphology of polyurethanes based on H12MDI and mixed macrodiols (PDMS-PHMO). In: Journal of Applied Polymer Science. 1999 ; Vol. 74, No. 12. pp. 2979-2989.
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