The optical parameters including the refractive index (𝑛) and thermo-optic coefficient, TOC (d𝑛/d𝑇), the dielectric constant (𝜀) and its variation with temperature, and the thermal volume expansion coefficient (𝛽) and its variation with temperature of chitosan–alizarin yellow GG (CS–AY GG) complex were examined. The dn/dT and 𝜀- values for the polymer derivative were in the range −2.5 × 10−4 to 1.2 × 10−4° C−1 and 2.2 to 2.3, respectively. The dn/dT values were larger than that of inorganic glasses such as zinc silicate glass (5.5 × 10−6° C−1) and borosilicate glass (4.1 × 10−6° C−1) and were larger than that of organic polymers such as polystyrene (−1.23 × 10−4 ° C−1) and PMMA (−1.20 × 10−4 ° C−1). The 𝜀-values are lower than optically estimated 𝜀-values of conventional polymer (3.00), aliphatic polyimide (2.5) and semi-aromatic polyamide (2.83). The obtained results of chitosan derivative are expected to be useful for optical switching and optical waveguide areas for devices of biomedical applications.
Volume 42 | Issue 5
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