Homework / test Da Inglese a Italiano Scienze Chimica; Scienze/Ingegneria chimica Organic Chemistry - Organoclays

Hi, I have a text on organoclays, but I am stuck on the word "moities"... Does anyone know what it is in Italian?

Here is some context:

"In order to extend their applications in other fields such as fillers and environmental barriers, the insertion of polymers or organic ***moities*** have been practiced, leading to the formation of organoclays"

Thank you very much! :o)