The kinetics of polyurethane structural foam formation: Foaming and polymerization

Rao, Rekha R.; Mondy, Lisa A.; Long, Kevin N.; Celina, Mathew C.; Wyatt, Nicholas; Roberts, Christine C.; Soehnel, Melissa M.; Brunini, Victor E.

doi:10.1002/aic.15680

The kinetics of polyurethane structural foam formation: Foaming and polymerization

Journal Article · Tue Feb 14 23:00:00 EST 2017 · AIChE Journal

DOI:https://doi.org/10.1002/aic.15680· OSTI ID:1369443

Rao, Rekha R. ^[1]; Mondy, Lisa A. ^[1]; Long, Kevin N. ^[1]; Celina, Mathew C. ^[1]; Wyatt, Nicholas ^[1]; Roberts, Christine C. ^[1]; Soehnel, Melissa M. ^[1]; Brunini, Victor E. ^[2]

Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sandia National Lab. (SNL-CA), Livermore, CA (United States)

We are developing kinetic models to understand the manufacturing of polymeric foams, which evolve from low viscosity Newtonian liquids, to bubbly liquids, finally producing solid foam. Closed-form kinetics are formulated and parameterized for PMDI-10, a fast curing polyurethane, including polymerization and foaming. PMDI- 10 is chemically blown, where water and isocyanate react to form carbon dioxide. The isocyanate reacts with polyol in a competing reaction, producing polymer. Our approach is unique, though it builds on our previous work and the polymerization literature. This kinetic model follows a simplified mathematical formalism that decouples foaming and curing, including an evolving glass transition temperature to represent vitrification. This approach is based on IR, DSC, and volume evolution data, where we observed that the isocyanate is always in excess and does not affect the kinetics. Finally, the kinetics are suitable for implementation into a computational fluid dynamics framework, which will be explored in subsequent papers.

View Accepted Manuscript (DOE)

Research Organization:: Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States); Sandia National Laboratories (SNL-CA), Livermore, CA (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: AC04-94AL85000

OSTI ID:: 1369443

Report Number(s):: SAND--2016-5741J; 643408

Journal Information:: AIChE Journal, Journal Name: AIChE Journal Journal Issue: 7 Vol. 63; ISSN 0001-1541

Publisher:: American Institute of Chemical EngineersCopyright Statement

Country of Publication:: United States

Language:: English

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36 MATERIALS SCIENCE
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The kinetics of polyurethane structural foam formation: Foaming and polymerization

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References (23)

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