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HomeMaterials Science ForumMaterials Science Forum Vol. 913Evaluation of Foaming and Nucleation and Growth...

Evaluation of Foaming and Nucleation and Growth Mechanism of Soy-Based Polyurethane Foams

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Abstract:

The foaming and nucleation and growth mechanism of soybean oil-based polyurethane (SPU) were determined by the degree of hydrogen bonding, and isocyanate groups. New types of SPU were prepared by the different NCO/OH molar ratio (isocyanate index) from 1.0 to 2.0 in a soy polyol/polyether polyol (MDI) system. Foaming and nucleation and growth mechanisms of SPU were studied by fluorescence microscope (FM), scanning electron microscope (SEM), energy disperse spectroscopy (EDS) and Fourier transform infrared spectroscopy (FT-IR). It indicated that the isocyanate index affected remarkably the velocity of foaming and the critical nucleation radius of SPU and the ester functional group increased with the increase of isocyanate index. The nucleation and growth phase transition were dominated by the diffusion controlled nucleation and isocyanate content was the key factor of foam formation.

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Periodical:

Materials Science Forum (Volume 913)

Pages:

738-745

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.913.738

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Online since:

February 2018

Authors:

Xiao Zhang, Xin Xing Zhou*

Keywords:

Composites, Curing of Polyurethane, Foaming, Growth Mechanism, Nucleation Mechanism, Scanning Electron Microscopy

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© 2018 Trans Tech Publications Ltd. All Rights Reserved

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