Title: Cross-Polymerization of Hard Blocks in Segmented Copoly(ether urea)s
Authors: Koevoets, Rolf A
Karthikeyan, S
Magusin, Pieter
Meijer, E. W
Sijbesma, Rint P # ×
Issue Date: 2009
Publisher: American Chemical Society
Series Title: Macromolecules vol:42 issue:7 pages:2609-2617
Abstract: Diacetylene-containing segmented copoly(ether urea) 1 was prepared via a polycondensation of 1,10-diisocyanato-deca-4,6-diyne with bis(3-aminopropyl)poly(tetrahydrofuran) (Mn ≈ 2300 g/mol). The reactive diacetylene spacer, which resides within the hard domains of the segmented elastomer, was cross-polymerized topochemically by means of UV radiation, without disrupting the flexible nature of the material, resulting in an intensely blue insoluble material. The extent of cross-polymerization was determined using solid-state 13C NMR and was found to be 10%. The optical properties of the cross-polymerized material could be modified mechanically and thermally as well as by changing the solvent. A study into the mechanochromic behavior—a color change from blue to yellow upon elongation—showed that the color changes are irreversible at strain levels greater than 80%. Polarized UV spectroscopy indicated that upon deformation the polydiacetylene chains orient parallel to the deformation axis. Thermochromic and solvatochromic behavior of 1 was completely irreversible.
ISSN: 0024-9297
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Non-KU Leuven Association publications
× corresponding author
# (joint) last author

Files in This Item:
File Description Status SizeFormat
Koevoets Macromol 2009.pdf Published 907KbAdobe PDFView/Open Request a copy

These files are only available to some KU Leuven Association staff members


All items in Lirias are protected by copyright, with all rights reserved.

© Web of science