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Interfacial Characterization of Multiple Layer Coatings on Thermoplastic Olefins (TPO)

Published online by Cambridge University Press:  01 February 2011

Aaron M Forster ,
Chris A. Michaels ,
Justin Lucas  and
Lipiin Sung
Aaron M Forster
Affiliation:
aaron.forster@nist.gov, National Institute of Standards and Technology, Building and Fire Research Laboratory, 100 Bureau Dr., Gaithersburg, MD, 20899, United States, 301-975-8701
Chris A. Michaels
Affiliation:
chris.michaels@nist.gov, National Institute of Standards and Technology, Surface and Microanalysis Science Division, 100 Bureau Dr., Gaithersburg, MD, 20899, United States
Justin Lucas
Affiliation:
justin.lucas@nist.gov, National Institute of Standards and Technology, Materials and Construction Research Division, 100 Bureau Dr., Gaithersburg, MD, 20899, United States
Lipiin Sung
Affiliation:
lipiin@nist.gov, National Institute of Standards and Technology, Materials and Construction Research Division, 100 Bureau Dr., Gaithersburg, MD, 20899, United States
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Abstract

Thermoplastic olefins (TPO) have made significant inroads as polymeric materials for interior and exterior automotive parts. Spray applied chlorinated polyolefins (CPO) are often used to improve paint adhesion to the low surface energy TPO substrates. The penetration of the CPO into the substrate is difficult to quantify, but is critical to achieving a good paint/TPO bond. The interphase between each layer in a coated TPO coupon was investigated using a combination of instrumented indentation and confocal Raman microscopy. The degree of CPO interpenetration was Thermoplastic olefins (TPO) have made significant inroads as polymeric materials for interior and exterior automotive parts. Spray applied chlorinated polyolefins (CPO) are often used to improve paint adhesion to the low surface energy TPO substrates. The penetration of the CPO into the substrate is difficult to quantify, but is critical to achieving a good paint/TPO bond. The interphase between each layer in a coated TPO coupon was investigated using a combination of instrumented indentation and confocal Raman microscopy. The degree of CPO interpenetration was altered by using three different CPOs exposed to two different manufacturing methods for the same TPO and base/clear coat system. It was found that the interfaces, CPO/base coat or CPO/TPO, were chemically and mechanically sharp at the 1 μm lateral resolution of both techniques. A gradient in the modulus through the thickness of the clear coat was observed using instrumented indentation.

Keywords

Raman spectroscopyhardnesspolymer
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1049: Symposium AA – Fundamentals of Nanoindentation and Nanotribology IV , 2007 , 1049-AA09-05
Copyright
Copyright © Materials Research Society 2008

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