thanks for the advice,
but I've searched almost anywhere I could find but nothing of much importance did come up.
Then you will have to develop stronger researching skills -- learn to use Google, if the first results are all commercial sources, keep checking down the page. You can also try the library, the librarian may be able to help you. Like
ARGOS++ : said, Wikipedia will give you a decent overview, for more specific questions, that many of us can give you some help with.
You may not be able to tell, but your initial question, is so general as to be almost meaningless -- you might as well ask:
Trees, are they made of wood? And what kinds of wood? or
Metals, how do we melt them, and why? Don't feel bad, I was once like you. Sometime in the last millennium, a high school teacher gave each student a nation in Africa to write a report on: National statistics, history, and current events. Working on Kenya at the last minute, I forgot to do the part on current events, and tried to explain it away -- "there is no info on current events in Kenya that I could find", said I. The teacher said, "Look harder, most nations have something happening, somewhere."
Your topics, plastics, and organic chemistry are not as obscure as you're saying they are.