Polyurethane surface chemical analysis

Paik, C. S., Hu, C. B. Surface Chemical Analysis of Segmented Polyurethanes. Fourier Transform IR Internal Reflection Studies in Advances in Chemistry Series,Cooper, S., Estes, G. (Eds) 176, 69 (1979)... 

Surface Chemical Analysis of Segmented Polyurethanes. Fourier Transform IR Internal Reflection Studies... 

The approach in this study to the analysis of polyurethane surfaces was based upon the idea that the surface properties represent a sunmation of the effects of all chemical groups at the surface. The various structural units which might be expected in a polyurethane were represented by model compounds. ESCA spectra of these model cosq>ounds revealed the chemical shifts for each type of group and the peak widths to be expected (Figure l). Unambiguous curve resolution can be performed using these two pieces of information (11). ... 

Lu H, Fookesa B, Obeng Y, Machinski S, Richardson KA. Quantitative analysis of physical and chemical changes in CMP polyurethane pad surfaces. Mater Charact 2002 49 35-44. 

On the other hand, it is important to say that chitin-pwlyurethane interaction has an important physical component, since attraction forces as Van der Waals interactions and hydrogen bonds are present at the interface chitin-polyurethane. This aspect could have caused that chitin-polyurethane chemical interaction was not strong enough to be more clearly observed by means of the FTIR-ATR analysis. In addition, chitin was added to the biocomposite in solid form, which limits the achievability of amine and hydroxyl groups of chitin surface due to a steric impediment. Other important aspect to point out is that polyurethane film thickness over the interface chitin-polyurethane could be irregular, which could difficult to reach the chitin-polyurethane interface by infrared light. 

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