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Infobox references. Polypropylene (PP), also known as polypropene, is a thermoplastic polymer used in a wide variety of applications. It is produced via chain-growth polymerization from the monomer propylene. Polypropylene belongs to the group of polyolefins and is partially crystalline and non-polar.
Eduard Simon, a German apothecary, discovers polystyrene. [2] 1844. Thomas Hancock patents the vulcanization of rubber in Britain immediately followed by Charles Goodyear in United States. [3] 1856. Parkesine, the first member of the Celluloid class of compounds and considered the first man-made plastic, is patented by Alexander Parkes. [4] 1869.
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.
An important optical parameter in the polymer used in laser applications is the change in refractive index with temperature also known as dn/dT. For the polymers mentioned here the (dn/dT) ~ −1.4 × 10 −4 in units of K −1 in the 297 ≤ T ≤ 337 K range. [57]
A thermoplastic, or thermosoftening plastic, is any plastic polymer material that becomes pliable or moldable at a certain elevated temperature and solidifies upon cooling. [1][2] Most thermoplastics have a high molecular weight. The polymer chains associate by intermolecular forces, which weaken rapidly with increased temperature, yielding a ...
Indonesia issued a Rp 50,000 commemorative banknote in conjunction with the 25 Years of Development by President Soeharto which is the first polymer banknote issued by Bank Indonesia.But polymer banknotes are never issued again in the later series. [23] Brunei: 1996 Brunei introduced its first polymer banknotes in denominations of 1, 5, 10 ...
A 2017 study found indoor airborne microfiber concentrations between 1.0 and 60.0 microfibers per cubic meter (33% of which were found to be microplastics). [120] Another study looked at microplastic in the street dust of Tehran and found 2,649 particles of microplastic within 10 samples of street dust, with ranging samples concentrations from ...
Large plastic bottles of water. A plastic bottle is a bottle constructed from high-density or low density plastic. Plastic bottles are typically used to store liquids such as water, soft drinks, motor oil, cooking oil, medicine, shampoo, milk, ink, etc. They come in a range of sizes, from very small bottles to large carboys.