Journal
INTERNATIONAL JOURNAL OF ADHESION AND ADHESIVES
Volume 78, Issue -, Pages 256-262Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ijadhadh.2017.08.006
Keywords
Crosslinking; Plasticization; Solubilization; Degree of functionality; Segmental dynamics
Funding
- Saint-Gobain, division of Bonded Abrasive
Ask authors/readers for more resources
In this study, thermal analysis, infrared spectroscopy (near and mid) in conjunction with low field NMR, have been used to characterize the crosslinking reaction involving phenol formaldehyde resin and a crosslinking agent, hexamethylenetetramine (HMTA) used as adhesive in organic-inorganic composites. The strong hydrogen bonds in the resin and the completely crystalline HMTA (T-m = 280 degrees C) severely hamper the crosslinking process. Yet the addition of a small amount of plasticizer can induce an efficient ( > 50% increase) crosslinking reaction as compared to the system without plasticizer. The infrared spectroscopy clarifies the dissolution process of the crystalline crosslinker and the specific interactions needed to achieve miscibility of the reactants. The thermal analysis enabled us to follow the reaction as a function of temperature. The low field NMR with the T-1 inverse recovery technique allowed us to monitor the crosslinking process directly. For the first time, it is now possible to identify the functionality of the plasticizer and correlate the degree of crosslinking achieved in order to assess the macroscopic cohesive strength needed for high performance adhesives.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available