John Paul Hogan – Co-discoverer of HDPE&PP polymers production methods

John Paul Hogan – Co-discoverer of HDPE&PP polymers production methods

John Paul Hogan

Biography & Contributions

John Paul Hogan was an American research chemist born on August 07, 1919 – died on February 19, 2012. Hogan was the co-discoverer of production methods for polypropylene and high-density polyethylene plastic polymers.

His work was primarily in the area of plastics and catalysts. In 1951, he invented crystalline polypropylene and high-density polyethylene (HDPE) with his fellow research chemist Robert Banks. Those plastics were initially known by the name Marlex.

Hogan worked with Clark, and eventually others, beginning by investigating the nickel oxide catalyst and using it to produce 223-trimethylpentene and 223-trimethylpentane. Ultimately Hogan and Banks discovered polypropylene.

High-density polyethylene Polymer [HDPE]

High-density polyethylene is a polyethylene thermoplastic made from petroleum. It is used in the production of plastic bottles, corrosion-resistant piping, geomembranes, and plastic lumber. HDPE is also used for cell liners in subtitle D sanitary landfills.

High-density polyethylene is commonly recycled, and has the number "2" as its resin identification code. High-density polyethylene, unlike polypropylene, cannot withstand normally required autoclaving conditions.

HDPE plastic has several properties that make it ideal as a packaging and manufacturing product. It’s stronger than standard polyethylene polymer and acts as an effective barrier against moisture and remains solid at room temperature. It resists insects, rot and other chemicals. HDPE creates no harmful emissions during its production or during its use by the consumer.  Also, HDPE leaks no toxic chemicals into the soil or water.

Polypropylene [PP]

Polypropylene is a thermoplastic polymer used in a wide variety of applications including packaging and labeling, textiles, ropes, stationery, plastic parts and reusable containers of various types, laboratory equipment, loudspeakers, automotive components, and polymer banknotes.

Polypropylene is normally tough and flexible, especially when copolymerized with ethylene. Polypropylene is reasonably economical, and can be made translucent when uncolored but is not as readily made transparent as polystyrene, acrylic, or certain other plastics. It is often opaque or colored using pigments. Polypropylene has good resistance to fatigue.

Polypropylene can also be made into disposable bottles to contain liquid, powdered, or similar consumer products, although HDPE and polyethylene terephthalate are commonly also used to make bottles. Polypropylene, highly colorfast, is widely used in manufacturing carpets, rugs and mats to be used at home. Polypropylene is widely used in ropes, distinctive because they are light enough to float in water.

Polypropylene is also used as an alternative to polyvinyl chloride (PVC) as insulation for electrical cables for LSZH cable in low-ventilation environments, primarily tunnels. Polypropylene is also used in particular roofing membranes as the waterproofing top layer of single-ply systems as opposed to modified-bit systems. It can also be produced in sheet form, widely used for the production of stationery folders, packaging, and storage boxes.

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