material-science-2019-accepted-abstracts

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Journal of Materials Science and Nanotechnology | Volume 3

February 25-26, 2019 | Paris, France

Materials Science and Engineering

International Conference on

The morphological evolution for composite urethane-based coating induced by photo-aging and the

characterization of photo-product using FTIR-ATR and ToFSIMS

Takato Ishida

and

Ryoma Kitagaki

University of Tokyo, Japan

urability is one of the most important aspects of

industrial materials, and an organic-based coating

is affected by outdoor conditions (e.g., ultraviolet (UV)

light, heat (temperature), moisture (humidity)). Generally

speaking, photodegradation is the most crucial for coating’s

weatherability, then, it also causes significant structural changes

on exposure to UV irradiation, which causes deterioration in

its physical and mechanical properties. Within degradation

induced morphological changes, pore structure (including

free volume) is well known as one of the most influential

characteristics on macroscopic properties. Besides, regarding

composite coatings (e.g., polymer matrix filled with titanium

dioxide), they commonly have a layer concentrated low

molecular weight component on the coating surface, this is

called as ‘clear layer’. The characteristics of such layer have a

significant impact on surface properties. In heavily degraded

case, the repairing by filling up coating binder component is

one of the possible options for continuing using for degraded

coatings, and then, we should choose the mending material

based on the characteristics of the deteriorated coating surface.

We have already found that the chemical character of surface

layer should be changed depending on the degree of chain

scission induced by UV irradiation, this might be because of

the diffusion of low molecular weight photo-product toward

the sample surface, driven by free energy gradient. Based on

above consideration, in this paper, we will report the internal

morphological change induced by photodegradation proved

by solvent swelling behavior and the change of surface layer

characteristics by using FTIR-ATR (Fourier transform infrared

spectroscopy attenuated total reflection) and ToFSIMS (Time-

of-Flight Secondary Ion Mass Spectrometry), moreover, their

mechanisms will be discussed.