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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.
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 ...
Invented in Halifax, Nova Scotia around 1970 by Peter Gamoulakos. [6] Fricot – A traditional stew consisting of clams, chicken and other meats. Ginger beef – is a Canadian Chinese dish made from beef, ginger, and a distinctive sweet sauce. Hawaiian pizza – invented by the Greek-Canadian cook and businessman Sam Panopoulos, in 1962.
Kevlar was initially used as a replacement for steel-belting in tires, and later for use in ropes, gaskets, and automotive and aviation parts. [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 ...
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 ...
Polymer Corporation's plant in Sarnia as depicted on the Bank of Canada $10 note issued in 1971. Polymer Corporation was a Canadian federal crown corporation established in 1942 to produce artificial rubber to substitute for overseas supply cut off by World War II.
Other newspapers followed including the Upper Canada Gazette at Newark (Niagara-on-the-Lake) in 1793, the first newspaper in what is now Ontario, the Quebec City Mercury, 1805, the Montreal Herald, 1811, Le Canadien 1806, La Minerve, 1826, and the Colonial Advocate and Novascotian both in 1824. These publications were simple affairs, typeset by ...
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