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Kevlar (para-aramid) [2] is a strong, heat-resistant synthetic fiber, related to other aramids such as Nomex and Technora.Developed by Stephanie Kwolek at DuPont in 1965, [3] [2] [4] the high-strength material was first used commercially in the early 1970s as a replacement for steel in racing tires.
Electronic sackbut – invented by Hugh Le Caine in 1945 as a precursor to voltage-controlled synthesizers; Five-pin bowling – invented by Thomas F. Ryan in Toronto in 1909; Goalie mask – invented by Jacques Plante in 1959; Ice hockey – invented in 19th century Canada; Instant replay – invented for CBC's Hockey Night in Canada in 1955
By 1971, modern Kevlar was introduced. [9] Kwolek learned that the fibers could be made even stronger by heat-treating them. The polymer molecules, shaped like rods or matchsticks, are highly oriented, which gives Kevlar its extraordinary strength. Kwolek continued research of thermotropic Kevlar derivatives containing aliphatic and chlorine ...
Cooper Canada Ltd. was a sporting goods and fine leather goods manufacturer based in Toronto, Ontario, Canada. In its heyday, the 1960s through to the 1980s, the company was Canada's leading producer of fine leathergoods, hockey, baseball and lacrosse equipment. [ 1 ]
[1] [3] In 1971, Shubin, who was then the Director of Science and Technology for the National Institute for Law Enforcement and Criminal Justice, [4] suggested using Kevlar to replace nylon in bullet-proof vests. [3] [5] Prior to the introduction of Kevlar, flak jackets made of nylon had provided much more limited protection to users. Shubin ...
May 22 – Ontario Place opens in Toronto; June 1 – Census Day for the 1971 Census of Canada, which finds Canada's total population to be 21,568,311. June 3 – The controversial Spadina Expressway project is cancelled; June 11 – Jack Davis becomes Canada's first Minister of the Environment, heading the new department of Environment Canada
DuPont first invented Kevlar in 1965 and its Maydown manufacturing facility is one of only three places in the world where Kevlar is produced. The DuPont site at Maydown is now the lead partner in the University of Ulster 's Biodiversity Action on Industrial Site (BAIS) project that aims to enhance biodiversity on land close to industrial activity.
Excellent thermal stability at temperature extremes, water repellency, chemical stability and resistance to petroleum products have made Kevlar KM2 an indispensable asset to the military personnel who use it every day." [1] "Kevlar KM2 fiber is a transversely isotropic material. Its tensile stress–strain response in the axial direction is ...