The end result of entropy is usually called the heat death of the universe. It is not a kind of matter. Heat death is a bit of an unfortunate phrase, since it implies that the universe dies through an excess of heat. read more
Tom Banks at the University of California, Santa Cruz, suggested then that the value of dark energy could be related to the entropy of space-time. Entropy is a measure of the disorder of a system: it’s low for a solid with rigidly organised atoms, and high for a hot gas with chaotically moving atoms. read more
Dark energy causes things to happen and entropy is the result of things happening so I don't even really understand your question since you seen to be treating entropy as causative. read more