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Phenol-formaldehyde resins, as a group, are formed by a step-growth polymerization reaction that can be either acid- or base-catalysed.Since formaldehyde exists predominantly in solution as a dynamic equilibrium of methylene glycol oligomers, the concentration of the reactive form of formaldehyde depends on temperature and pH.
[12] [13] From the 1990s onward, concern has been raised over the use of BADGE-based epoxy resins in the lining of some cans for foodstuffs, with the chemical being found to leach into foods. [ 12 ] [ 14 ] Bisphenol A Diglycidyl ether-based epoxy coatings are extensively used for coating the inside of cans which come into contact with food and ...
Epoxy is the family of basic components or cured end products of epoxy resins. Epoxy resins, also known as polyepoxides, are a class of reactive prepolymers and polymers which contain epoxide groups. The epoxide functional group is also collectively called epoxy. [1] The IUPAC name for an epoxide group is an oxirane.
Philstar Global, operating as Philstar.com, is a Philippine news website owned by Philstar Global Corporation, a subsidiary of Hastings Holdings/Philstar Media Group under MediaQuest Holdings. The site began online in 2000 as a repository for The Philippine Star and its sister newspapers, before it began publishing its own news articles since 2009.
Polyunsaturated vegetable oils are widely used as precursors to epoxidized oil products because they have high numbers of carbon-carbon double bonds available for epoxidation. [4] The epoxide group is more reactive than double bond, thus providing a more energetically favorable site for reaction and making the oil a good hydrochloric acid ...
Chinese Commercial News (菲律賓商報) Philippine Chinese Daily (菲律賓華報) Sino-Fil Daily (菲華日報) Ta Kung Pao - Philippine edition (大公報 - 菲律賓版) United Daily News (聯合日報) Wen Wei Po - Philippine edition (文匯報 - 菲律賓版) World News (世界日報)
Yang Hongming (Chinese: 杨鸿明), [1] more commonly known as Michael Yang in the Philippines, is a Chinese businessman and is an associate of 16th Philippine President Rodrigo Duterte. Yang was linked in the Pharmally scandal which allegedly overpriced procurement contracts for medical supplies to be used by the Philippine government during ...
Rappler (portmanteau of the words "rap" and "ripple") [3] is a Filipino online news website based in Pasig, Metro Manila, the Philippines.It was founded by 2021 Nobel Peace Prize laureate Maria Ressa along with a group of fellow Filipino journalists as well as technopreneurs.