In-situ chemical structure analysis of aqueous vinyl polymer solution-isocyanate adhesive in post-cure process by using Fourier transform near infrared spectroscopy

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, wh...

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Bibliographic Details
Published inInternational journal of adhesion and adhesives Vol. 81; pp. 56 - 64
Main Authors Ling, Zhigang, Omura, Yuuki, Hori, Naruhito, Iwata, Tadahisa, Takemura, Akio
Format Journal Article
LanguageEnglish
Published Kidlington Elsevier Ltd 01.03.2018
Elsevier BV
Subjects
Absorption spectra
Adhesion tests
Adhesive bonding
API/EPI
Butadiene
Chemical bonds
Chemical reactions
Crosslinking
Filter paper
Fourier transforms
FT-NIR
Infrared spectroscopy
Isocyanates
Latex
Near infrared radiation
Polyisocyanate
Polyurethane
Polyvinyl alcohol
Post-cure
Rubber
Structural analysis
Thermodynamic properties
Urethane
FT-NIR
API/EPI
Urethane
Post-cure
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Summary: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 5005cm-1 and 5065cm-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.
ISSN:0143-7496
1879-0127
DOI:10.1016/j.ijadhadh.2017.11.007