Search results
Results from the WOW.Com Content Network
Polypropylene (PP), also known as polypropene, ... The stereoselective polymerization to the isotactic was discovered by Giulio Natta and Karl Rehn in March 1954. [3]
1889. Eastman Kodak successfully filed a patent for the celluloid film. [6] 1890s. Galalith, a plastic derived from casein developed by Wilhelm Krische and Adolph Spitteler. [7] 1890s. Auguste Trillat discovered the means to insolubilize casein by immersion in formaldehyde, producing material marketed as galalith.
A study from 2024 found that compared to glass and aluminum, plastic may actually have less of a negative effect on the environment and therefore might be the best option for must food packaging and other common uses. [125] The study found that, "replacing plastics with alternatives is worse for greenhouse gas emissions in most cases."
Polypropylene manufacturers consume nearly two thirds of global production. [17] Polypropylene end uses include films, fibers, containers, packaging, and caps and closures. Propene is also used for the production of important chemicals such as propylene oxide, acrylonitrile, cumene, butyraldehyde, and acrylic acid. In the year 2013 about 85 ...
September 3, 2024 at 6:00 AM. A chemistry lab at UC Berkeley says it has devised a chemical reaction that could address much of our plastic waste. (Andrew Medichini / Associated Press) Despite the ...
J. Paul Hogan. John Paul Hogan (August 7, 1919 [1] – February 19, 2012) [2][3] was an American research chemist. Along with Robert Banks, he discovered methods of producing polypropylene and high-density polyethylene. [1]
A polymer (/ ˈpɒlɪmər / [4][5]) is a substance or material that consists of very large molecules, or macromolecules, that are constituted by many repeating subunits derived from one or more species of monomers. [6]
The earliest known life forms on Earth may be as old as 4.1 billion years (or Ga) according to biologically fractionated graphite inside a single zircon grain in the Jack Hills range of Australia. [2] The earliest evidence of life found in a stratigraphic unit, not just a single mineral grain, is the 3.7 Ga metasedimentary rocks containing ...