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Synthesis, Structure and Properties of MelamineB pTHF-Urethane Supramolecular Compounds.

Öjelund, K; Loontjens, T; Steeman, P; Palmans, A and Maurer, Frans LU (2003) In Macromolecular Chemistry and Physics 204(1). p.52-60
Abstract
The properties of melamine based supramolecular compounds have been studied with rheological, thermal, mechanical, dielectric and scattering techniques and compared with similar covalently bonded materials. The complexes are based on a linear pTHF-diol ([bar M ]n = 1 000) connected via a diisocyanate with melamine. The results obtained show that, despite of the material's low molecular weight (< 2 000 g · mol-1), it has properties typical for high molar mass polymers. The material has a high modulus above the glass transition temperature, and shows behavior similar to a semi-crystalline material. This is attributed to the presence of the hydrogen bonds, in combination with phase separation giving rise to hard domain formation. In... (More)
The properties of melamine based supramolecular compounds have been studied with rheological, thermal, mechanical, dielectric and scattering techniques and compared with similar covalently bonded materials. The complexes are based on a linear pTHF-diol ([bar M ]n = 1 000) connected via a diisocyanate with melamine. The results obtained show that, despite of the material's low molecular weight (< 2 000 g · mol-1), it has properties typical for high molar mass polymers. The material has a high modulus above the glass transition temperature, and shows behavior similar to a semi-crystalline material. This is attributed to the presence of the hydrogen bonds, in combination with phase separation giving rise to hard domain formation. In comparison with a covalently bonded and a low molecular weight material of similar composition, the supramolecular compounds have a higher and more temperature dependent viscosity. By exchanging parts of the pTHF with a low molecular weight diol, in our case hexane diol, the mechanical properties at room temperature could be modified to a stiffer but more brittle material. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Macromolecular Chemistry and Physics
volume
204
issue
1
pages
52 - 60
publisher
John Wiley & Sons
external identifiers
  • wos:000181508300006
  • scopus:0037472319
ISSN
1521-3935
DOI
10.1002/macp.200290055
language
English
LU publication?
yes
id
0e1d4072-6f37-4811-a568-a245f099191e (old id 129556)
date added to LUP
2007-07-13 15:00:33
date last changed
2018-02-04 03:24:59
@article{0e1d4072-6f37-4811-a568-a245f099191e,
  abstract     = {The properties of melamine based supramolecular compounds have been studied with rheological, thermal, mechanical, dielectric and scattering techniques and compared with similar covalently bonded materials. The complexes are based on a linear pTHF-diol ([bar M ]n = 1 000) connected via a diisocyanate with melamine. The results obtained show that, despite of the material's low molecular weight (&lt; 2 000 g · mol-1), it has properties typical for high molar mass polymers. The material has a high modulus above the glass transition temperature, and shows behavior similar to a semi-crystalline material. This is attributed to the presence of the hydrogen bonds, in combination with phase separation giving rise to hard domain formation. In comparison with a covalently bonded and a low molecular weight material of similar composition, the supramolecular compounds have a higher and more temperature dependent viscosity. By exchanging parts of the pTHF with a low molecular weight diol, in our case hexane diol, the mechanical properties at room temperature could be modified to a stiffer but more brittle material.},
  author       = {Öjelund, K and Loontjens, T and Steeman, P and Palmans, A and Maurer, Frans},
  issn         = {1521-3935},
  language     = {eng},
  number       = {1},
  pages        = {52--60},
  publisher    = {John Wiley & Sons},
  series       = {Macromolecular Chemistry and Physics},
  title        = {Synthesis, Structure and Properties of MelamineB pTHF-Urethane Supramolecular Compounds.},
  url          = {http://dx.doi.org/10.1002/macp.200290055},
  volume       = {204},
  year         = {2003},
}