Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7171004 | International Journal of Adhesion and Adhesives | 2018 | 9 Pages |
Abstract
API (aqueous vinyl polymer solution-isocyanate) adhesive was prepared from PVA (polyvinyl alcohol) aqueous solution, SBR (styrene-butadiene rubber) latex and pMDI (polymethylene polyphenyl polyisocyanate). A paper sample was prepared by sandwiching API adhesive between two pieces of filter paper, which could be regarded as the model for an actual bonded structure in a practical application. In a post-cure process an in-situ chemical structure analysis of the adhesive layer in the paper sample was carried out using FT-NIR (Fourier transform near infrared) spectroscopy. The absorption bands of urea and urethane, two primary products generated from the chemical reactions of isocyanates, were assigned on a 2nd derivative spectrum at 5005Â cm-1 and 5065Â cm-1, respectively. Band intensities of urea and urethane increased with time during the post-cure process, indicating the advance of chemical reactions in the adhesive layer. DSC was utilized to analyze the thermal properties of the API adhesive film sample, together with the cross-linking density in the API adhesive film sample which was tested using DMA. In addition, FT-IR spectroscopy was used to confirm the chemical reactions of isocyanate in the API adhesive thin film sample.
Related Topics
Physical Sciences and Engineering
Engineering
Mechanical Engineering
Authors
Zhigang Ling, Yuuki Omura, Naruhito Hori, Tadahisa Iwata, Akio Takemura,