Synthesis and characterization of poly (dimethylsiloxane-urethane) elastomers: Effect of hard segments of polyurethane on morphological and mechanical properties

Madhavan Karunakaran, B. S.R. Reddy*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

58 Scopus citations

Abstract

A series of poly(dimethylsiloxane-urethane) elastomers based on hexamethylenediisocyanate, toluenediisocyanate, or 4,4′- methylenediphenyldiisocyanate hard segment and polydimethylsiloxane (PDMS) soft segment were synthesized. In this study, a new type of soft-segmented PDMS crosslinker was synthesized by hydrosilylation reaction of 2-allyloxyethanol with polyhydromethylsiloxane, using Karstedt's catalyst. The synthesized soft-segmented crosslinker was characterized by FT-IR, 1H, and 13C NMR spectroscopic techniques. The mechanical and thermal properties of elastomers were characterized using tensile testing, thermogravimetric analysis, differential scanning calorimetry (DSC), and dynamical mechanical analysis measurements. The molecular structure of poly(dimethylsiloxane-urethane) membranes was characterized by ATR-FTIR spectroscopic techniques. Infrared spectra indicated the formation of urethane/urea aggregates and hydrogen bonding between the hard and soft domains. Better mechanical and thermal properties of the elastomers were observed. The restriction of chain mobility has been shown by the formation of hydrogen bonding in the soft and hard segment domains, resulting in the increase in the glass-transition temperature of soft segments. DSC analysis indicates the phase separation of the hard and soft domains. The storage modulus (E') of the elastomers was increasing with increase in the number of urethane connections between the hard and soft segments.

Original languageEnglish (US)
Pages (from-to)2980-2989
Number of pages10
JournalJournal of Polymer Science, Part A: Polymer Chemistry
Volume44
Issue number9
DOIs
StatePublished - May 1 2006

Keywords

  • Polydimethylsiloxane
  • Soft-segmented crosslinker
  • Urethane/urea

ASJC Scopus subject areas

  • Polymers and Plastics
  • Organic Chemistry
  • Materials Chemistry

Fingerprint

Dive into the research topics of 'Synthesis and characterization of poly (dimethylsiloxane-urethane) elastomers: Effect of hard segments of polyurethane on morphological and mechanical properties'. Together they form a unique fingerprint.

Cite this