期刊
INDUSTRIAL CROPS AND PRODUCTS
卷 27, 期 2, 页码 208-213出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.indcrop.2007.07.009
关键词
LPF resins; lignin; novolac; isocyanate curing
This work proposes the use of a diisocyanate as curing agent for novolac-type lignin-phenol-formaldehyde (LPF) resins, instead of typical hexamethylene-tetraamine (HMTA), with the aim of overcoming the loss of reactivity of lignophenolic resins resulting from the introduction of lignin. Curing LPF resins with methylene-diisocyanate (MDI) and HMTA has been investigated through Fourier transform infrared (FT-IR) spectroscopy, differential scanning calorimetry (DSC) and rheological analysis. The analysis of experimental results shows that the proposed curing reaction with MDI gives similar results to those for HMTA-cured systems. However, MDI curing is faster than HMTA one and proceeds easier at lower temperatures. (c) 2007 Elsevier B.V. All rights reserved.
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