Title page for ETD etd-11152013-040504


Type of Document Master's Thesis
Author Burtoff, Chuck
URN etd-11152013-040504
Title Surface analysis of sheet molded composite (SMC) material as related to adhesion
Degree Master of Science
Department Chemistry
Advisory Committee
Advisor Name Title
John G. Dillard Committee Chair
H. Brinson Committee Member
J. P. Wightman Committee Member
Keywords
  • Composite materials
Date of Defense 1986-04-05
Availability restricted
Abstract
The surface chemical properties of Sheet Molded Composite (SMC)

materials, formulated to contain polyester binder, calcium carbonate

filler, and glass fibers, have been investigated with emphasis on how

the surface properties are related to adhesion. These surface

properties, relative elemental concentrations and their chemical states,

were studied using x-ray photoelectron spectroscopy (XPS) before and

after a series of surface treatments as well as after mechanical lap

shear fracture tests for SMCs bonded with urethane adhesive. Surface

chemical functionalities, including -C-0·R(X)/-NCO2R and -C=0 (ester

carbonyl) groups, were found to promote good adhesion using urethane

adhesives. These chemical functionalities_were particularly enhanced

after treating the SMC surface with an isocyanate primer as well as

after a solvent/abrasive surface pretreatment done with a Scotch Brite

abrasive pad soaked in methylene chloride and after washing the SMC

surfaces with hot aqueous chemicals at high pressures.

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