NDLI: High-Strength and Low-Cost Biobased Polyurethane Foam Composites Enhanced by Poplar Wood Powder Liqtion

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High-Strength and Low-Cost Biobased Polyurethane Foam Composites Enhanced by Poplar Wood Powder Liqtion

Content Provider	MDPI
Author	Yang, Wanjia Han, Yanming Zhang, Wei Zhang, Derong
Copyright Year	2021
Description	An environmentally friendly liqtion of wood powder was prepared by atmospheric pressure liqtion technology to replace the non-renewable petroleum polyols in the preparation of polyurethane foam composites. The liqtion time varied from 0 min to 140 min. The composition of liquefied products and the effects of liqtion time on the morphology, apparent density and mechanical properties of polyurethane foam composites were investigated. The results showed that the optimal process time for the preparation of wood powder liqtion products, which could replace traditional petroleum polyols, was 110 min. At this time, polyether polyols are the main liqtion products, with an average molecular weight in Mn reaching 237 and average molecular weight in Mw reaching 246. The functional group of the liquefied product consisted mainly of hydroxyl, with the highest content of 1042 mg KOH/g and the lowest acid number of 1.6 mg KOH/g. In addition, the surface of the polyurethane foam based on poplar wood is dominated by closed cell foam; thus its foam has good heat insulation and heat preservation properties. At 110 min liqtion time, the apparent density of polyurethane foam is 0.164 $g/cm^{3}$ and the compression strength is 850 kPa, which is higher than that of traditional polyurethane foam (768 kPa), which is without wood powder modification. Replacing petroleum polyol with renewable wood powder liqtion products to prepare biomass-based polyurethane foam composite materials, researching complex chemical changes in different liqtion stages, and finding the best liqtion conditions are of great significance to optimize the performance of polyurethane, address the shortage of resources and reduce environmental pollution.
Starting Page	2999
e-ISSN	20734360
DOI	10.3390/polym13172999
Journal	Polymers
Issue Number	17
Volume Number	13
Language	English
Publisher	MDPI
Publisher Date	2021-09-04
Access Restriction	Open
Subject Keyword	Polymers Paper and Wood Polyurethane Foam Composites Poplar Wood Powder Liquefaction Liquefaction Environmentally Friendly
Content Type	Text
Resource Type	Article

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