Other
Petrochemicals Europe: Discovery Timeline
Follow this timeline to learn about the development of the petrochemical industry and significant innovators in the creation of many of the products we take for granted.
Science Struck
Science Struck: Properties and Uses of Polypropylene
Discusses properties, uses, and facts about polypropylene.
Wikimedia
Wikipedia: Polypropylene
This site from Wikipedia, the free encyclopedia, provides brief but factual information on the function of Polypropylene. A good site to get a short overview on the subject, with a few links to additional information.