MOLECULAR WEIGHT EFFECTS OF THE SOFT SEGMENT ON THE ULTIMATE PROPERTIES OF LIGNIN-DERIVED POLYURETHANES

Autor:	S. M. Aharoni, R. W. Thring, P. Ni
Rok vydání:	2004
Předmět:	Materials science Polymers and Plastics General Chemical Engineering Polyethylene glycol Casting Analytical Chemistry Solvent chemistry.chemical_compound chemistry PEG ratio Ultimate tensile strength Lignin Solvolysis Composite material Polyurethane
Zdroj:	International Journal of Polymeric Materials. 53:507-524
ISSN:	1563-535X 0091-4037
DOI:	10.1080/00914030490267627
Popis:	Polyurethane (PU) films were prepared by solution casting using a three-component system, namely a novel semi-rigid solvolytic lignin, soft segment and a co-monomer. In the present study, the effects of varying the chain length of polyethylene glycol (as the soft segment) were investigated to produce lignin-based polyurethanes with variable thermal and mechanical properties. An important objective was to incorporate as much lignin as possible. The polyethylene glycol (PEG) studied included 5 different molecular weights (200, 400, 1000, 1500 and 2000 g/mol). The polyurethane films, prepared by solvent casting, were evaluated for crosslink density, and ultimate mechanical and thermal properties. Results showed that the films derived from the PEG 200 were either too weak or brittle to be tested. It was found that the PEG (400, 1000, and 1500) are better choices for producing polyurethanes from the solvolysis lignin studied. Crosslink densities of PU films using the 400, 1000 and 1500 were determined to be in...
Databáze:	OpenAIRE
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