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Synthesis, Structure and Properties of Melamine‐Based pTHF‐Urethane Supramolecular Compounds
Author(s) -
Öjelund Karin,
Loontjens Ton,
Steeman Paul,
Palmans Anja,
Maurer Frans
Publication year - 2003
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/macp.200290055
Subject(s) - supramolecular chemistry , molar mass , hydrogen bond , melamine , materials science , glass transition , polymer chemistry , diol , polymer , rheology , composite material , chemical engineering , chemistry , molecule , organic chemistry , engineering
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 ( 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.