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Thermal properties of solvolysis lignin‐derived polyurethanes
Author(s) -
Nakamura K.,
Hatakeyama T.,
Hatakeyama H.
Publication year - 1992
Publication title -
polymers for advanced technologies
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.61
H-Index - 90
eISSN - 1099-1581
pISSN - 1042-7147
DOI - 10.1002/pat.1992.220030402
Subject(s) - thermal decomposition , peg ratio , differential scanning calorimetry , polyethylene glycol , thermogravimetry , isocyanate , polyurethane , solvolysis , materials science , glass transition , polypropylene glycol , polymer chemistry , nuclear chemistry , lignin , organic chemistry , chemistry , polymer , inorganic chemistry , composite material , physics , finance , hydrolysis , economics , thermodynamics
Abstract Thermal properties of polyurethane (PU) films prepared from solvolysis lignin (SL), polyethylene glycol (PEG) and diphenylmethane diisocyanate (MDI) were examined by differential scanning calorimetry and thermogravimetry. In the SL—PEG—MDI system, the SL content, the molecular weight ( M n ) of PEG and the NCO/OH ratio were changed in order to control the thermal properties. Glass transition temperatures ( T g 's) of the prepared PU's were dependent on the SL content, the M n of PEG and the NCO/OH ratio. However, the T g of PU was significantly influenced by the SL content: the increment of T g was ca. 150 K when the SL content in PEG increased from 0 to ca. 50%. The decomposition of the PU's was markedly dependent on the content of SL. Other factors, such as the NCO/OH ratio and the M n of PEG, are less dominant compared with the SL content. This fact suggests that the dissociation between the isocyanate groups and the phenolic OH groups in SL may be the major factor in the whole process of the thermal decomposition of the PU containing SL