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Morphology of Lignin-Polyurethane Blends

Published online by Cambridge University Press:  22 February 2011

D. Feldman  and
M.A. Lacasse
D. Feldman
Affiliation:
Centre for Building Studies, Concordia University, 1455 de Maisonneuve West, Montreal H3G 1M8, Canada
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Abstract

The morphology of blended polyurethane (PU) sealants was studied by scanning electron microscopy (SEM) and differential scanning calorimetry (DSC). The PU was modifided by mechanical mixing with various amounts of Lignin (L) to achieve a homogeneous blend. Specimens were subjected to control (C), accelerated weathering (AW), and natural weathering (NW) conditions. Results obtained from SEM analysis reveal an even distribution of L particles in the PU matrix. Furthermore, the SEM photomicrographs clearly emphasize the differing morphologies of the constituent phases. They also depict the differences in surface texture between control and aged specimens. The DSC analysis shows that the two phases are immiscible which is in agreement with observations by microscopy.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 153: Symposium J – Interfaces Between Polymers, Metals, and Ceramics , 1989 , 193
Copyright
Copyright © Materials Research Society 1989

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