Abstract
The various techniques of FTIR method, such as KBr-pellet, ATR(attenuated total reflectance) and PAS (photoacoustic spectroscopy), were investigated in order to analyze the amount of epoxide added onto wool fibers. The multifunctional epoxide of PPE(polyglycerol pclyglycidyl ether) was used with different concentrations for the preparation of samples with various add-on. As a result of ailalysis of FTIR spectrum, typical ether peak of PPE epoxide appeared at around $1111 cm^{-1}$ for the KBr-pellet and PAS method while this peak shifted to $1070 cm^{-1}$ in the case of ATR method. The absorbance ratios of amide I,II,III band and ether band were plotted against epoxide add-on individually for determining the linear relation. The best linear fitting was observed with the absorbance ratio of amide III and ether band in both KBr-pellet and ATR method. Therefore, the amount of epoxide could be determined quantitatively by using FTIR spectrum. The slopes of linear fitting were calculated for both methods and compared these values with each other. The difference in slope suggests that the reaction occurs predominantly at the surface rather than inside of the fiber. This result can also be confirmed by FTIR-PAS method, in which IR spectrum was obtained under the control of penetration depth.oss-linked polyurethanes exhibited higher stress than linear polyurethane at the same strain level. The chemical cross-linkages between diacetylene groups appeared to make more stable hard domain to the external deformation.
