where ΔL, Δa, and Δb are the difference between each color values of
standard color plate and film specimen, respectively.
The optical properties of the films were tested by measuring UV/vis
absorption and transmission spectrum of the films.
UV/vis absorption
and transmission measurements were performed in the range of 200–
700 nm using a UV/vis spectrophotometer (Model 8451A, Hewlett
Packard Co., Santa Alara, CA, USA).
Transparency of the film samples
was expressed as the percent transmittance measured at 660 nm.
where ΔL, Δa, and Δb are the difference between each color values ofstandard color plate and film specimen, respectively.The optical properties of the films were tested by measuring UV/visabsorption and transmission spectrum of the films. UV/vis absorptionand transmission measurements were performed in the range of 200–700 nm using a UV/vis spectrophotometer (Model 8451A, HewlettPackard Co., Santa Alara, CA, USA). Transparency of the film sampleswas expressed as the percent transmittance measured at 660 nm.
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