Award Date

1-1-2003

Degree Type

Thesis

Degree Name

Master of Science (MS)

Department

Mechanical Engineering

First Committee Member

Brendan O'Toole

Number of Pages

225

Abstract

Rigid polyurethane foams can be used as a thermal or vibration insulator and energy absorption material. They are often molded directly in place, where a smooth, thin skin forms between the mold and the cellular structure of the foam. Density gradients and the skin are shown to have an effect on the mechanical properties of the foam; This work will investigate the effects of processing temperature and mold size on the average density, density gradient, compressive modulus, and compressive strength, for a molded free rise, water blown polyurethane foam system. Four processing temperatures are used during foam fabrication: 25°C, 40°C, 65°C, and 85°C. Three aluminum cylinder mold sizes are used with diameters of 29mm, 41mm, and 51mm. The properties are also compared to reference samples with a uniform density of 0.101 g/cc; Results show that processing temperature and mold size have a significant effect on density, density gradients and some mechanical properties.

Keywords

Density; Effects; Foam; Gradient; Mechanical; Mold; Polyurethane; Properties; Size; System; Temperature

Controlled Subject

Mechanical engineering; Materials science; Plastics

File Format

pdf

File Size

9543.68 KB

Degree Grantor

University of Nevada, Las Vegas

Language

English

Permissions

If you are the rightful copyright holder of this dissertation or thesis and wish to have the full text removed from Digital Scholarship@UNLV, please submit a request to digitalscholarship@unlv.edu and include clear identification of the work, preferably with URL.

Rights

IN COPYRIGHT. For more information about this rights statement, please visit http://rightsstatements.org/vocab/InC/1.0/

Download


COinS