Journal
POLYMER
Volume 55, Issue 25, Pages 6529-6538Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.polymer.2014.10.043
Keywords
Crude glycerol; Monoglycerides; Biopolyols
Categories
Funding
- USDA-NIFA Critical Agricultural Materials Program [2012-38202-19288]
- Ohio Soybean Council
- U.S. DOE [DE-AC02-06CH11357]
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Environmentally friendly biopolyols have been produced with crude glycerol as the sole feedstock using a one-pot thermochemical conversion process without the addition of extra catalysts and reagents. Structural features of these biopolyols were characterized by rheology analysis. Rigid polyurethane (PU) foams were obtained from these crude glycerol-based biopolyols and the foaming mechanism was explored. Investigations revealed that partial carbonyl groups hydrogen-bonded with N-H were replaced by aromatic rings after the introduction of branched fatty acid ester chains in the urea rich phase, and that distinct microphases had formed in the foams. Studies showed that branched fatty acid ester chains in the biopolyols played an important role in reducing the degree of microphase separation and stabilizing bubbles during foaming processes. PU foams with thermal conductivity comparable to commercial products made from petroleum-based polyols were obtained. These studies show the potential for development of PU foams based on crude glycerol, a renewable resource. (C) 2014 Elsevier Ltd. All rights reserved.
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