Probing the hard segment phase connectivity and percolation in model segmented poly(urethane urea) copolymers

Jignesh P. Sheth, Garth L. Wilkes, Ann R. Fornof, Timothy Edward Long, Iskender Yilgor

Research output: Contribution to journalArticle

46 Citations (Scopus)

Abstract

Soluble model segmented poly(urethane urea)s (PUU) with or without hard segment (HS) branching were utilized to explore the importance of hydrogen bonding and chain architecture in mediating the long-range connectivity of the HS phase. The HS content of all the PUU copolymers was 22 wt%, and the soft segment (MW 970 g/mol) was a heterofed random copolymer of 50:50 ethylene oxide:propylene oxide, which possesses a single terminal hydroxyl group (monol). An 80:20 isomeric mixture of 2,4- and 2,6-toluene diisocyanate, 4,4′,4″-triphenylmethane triisocyanate and water were utilized during the chain extension step of the synthesis to incorporate HS branching. DSC and SAXS results on the final plaques indicated that the samples were still able to establish a microphase morphology even in the presence of the highest extent of HS branching utilized in the study. The tapping-mode AFM phase image of the PUU sample without HS branching exhibited the presence of long ribbonlike hard domains that percolated through the soft matrix. The long-range connectivity of the HS was increasingly disrupted with higher levels of HS branching. Accompanying such disruption was a systematic mechanical softening of the PUU samples. FT-IR indicated that incorporation of HS branching disrupted the hydrogen-bonded network within the hard phase. These results demonstrate the importance of hydrogen bonding and chain architecture in mediating the long-range connectivity and percolation of the HS and achieving dimensional stability.

Original languageEnglish
Pages (from-to)5681-5685
Number of pages5
JournalMacromolecules
Volume38
Issue number13
DOIs
Publication statusPublished - 2005 Jun 28
Externally publishedYes

Fingerprint

Urethane
Urea
Hydrogen bonds
Copolymers
Ethylene Oxide
Oxides
Dimensional stability
Hydroxyl Radical
Propylene
Toluene
Hydrogen
Ethylene
Water
propylene oxide
triphenylmethane triisocyanate
2,6-diisocyanatotoluene

ASJC Scopus subject areas

  • Organic Chemistry
  • Polymers and Plastics
  • Inorganic Chemistry
  • Materials Chemistry

Cite this

Probing the hard segment phase connectivity and percolation in model segmented poly(urethane urea) copolymers. / Sheth, Jignesh P.; Wilkes, Garth L.; Fornof, Ann R.; Long, Timothy Edward; Yilgor, Iskender.

In: Macromolecules, Vol. 38, No. 13, 28.06.2005, p. 5681-5685.

Research output: Contribution to journalArticle

Sheth, Jignesh P. ; Wilkes, Garth L. ; Fornof, Ann R. ; Long, Timothy Edward ; Yilgor, Iskender. / Probing the hard segment phase connectivity and percolation in model segmented poly(urethane urea) copolymers. In: Macromolecules. 2005 ; Vol. 38, No. 13. pp. 5681-5685.
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