Researchers Create Pressure Sensitive Adhesive from Black Pepper and Castor Oil

Posted on 2/18/2020 10:06:54 AM By ASC

University of the Basque Country’s POLYMAT Institute have been looking at ways for renewable biological products to play a larger role in the manufacture of pressure sensitive adhesives, and have chosen what might seem to be an unlikely couple to kick start the process. However, results show this odd couple may be capable of achieving far more than the researchers thought, thanks to UV light.

The researchers ignored a more well-known contender, fatty acids, because of their hydrophobicity which complicates emulsion polymerization. Instead they chose black pepper for its piperonyl, and the 2-octyl acrylate drawn from castor oil as being the chief players in reaching their goal of producing PSAs made up of 71% renewable biological products.

The institute reports that in addition to piperonyl’s structure suggesting it can be turned into  piperonyl methacrylate in just two steps, it is already produced on an industrial scale, and can be included in conventional production plants which already use emulsion polymerization.

According to the researchers, when conducting tests on the polymers created by blending the two products to compare them with existing PSA materials, results were positive. However, unexpectedly, the tests also indicated that under UV light their new polymer’s strength, shear resistance and adhesive qualities could be manipulated, so increasing their potential far beyond the realms of PSAs.

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