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Poly(methyl methacrylate) (PMMA) is a synthetic polymer derived from methyl methacrylate. It is a transparent thermoplastic, used as an engineering plastic. PMMA is also known as acrylic, acrylic glass, as well as by the trade names and brands Crylux, Hesalite, Plexiglas, Acrylite, Lucite, and Perspex, among several others .
para-Methoxy-N-methylamphetamine (also known as PMMA, Red Mitsubishi), chemically known as methyl-MA, 4-methoxy-N-methylamphetamine, and 4-MMA (or 4-PMDA, as listed to its original physical name) is a stimulant and psychedelic drug closely related to the amphetamine-class serotonergic drug para-methoxyamphetamine (PMA).
The polymers are colorless. This homopolymer is far less important than copolymers derived from methyl acrylate and other monomers. PMA is softer than polymethyl methacrylate (PMMA), [1] It is tough, leathery, and flexible. [2]
PMMA may refer to: para-Methoxymethamphetamine, a stimulant drug; Philippine Merchant Marine Academy; Poly(methyl methacrylate), a transparent thermoplastic often ...
It has better thermal stability, higher resistance to crazing when exposed to solvents, wider thermoforming range than extruded acrylic. Cast acrylic has a better ability to be reworked hot and it is known for its superior surface finish and optical properties.
The entrance to the PMMA in San Narciso, Zambales A historical marker at the old PMMA site in Intramuros. The academy offers courses for Bachelor of Science degrees in marine transportation and marine engineering. Both are four-year residency courses consisting of three-years of academic studies (first, second, and fourth years).
PMMA Polymethyl methacrylate RGP Rigid-gas-permeable SCL Soft contact lens: SiH Silicone hydrogel SEAL Superior epithelial arcuate lesion SLK Superior limbic keratoconjunctivitis SPK Superficial punctate keratitis SPEE Superficial punctate epithelial erosions TBUT Tear break-up time: Tc Centre thickness TD Total diameter Te Edge thickness TWT/WTT
Asahi Chemical developed a process based on direct oxidative esterification of methacrolein, which does not produce by-products such as ammonium bisulfate. The raw material is tert-butanol, as in the direct oxidation method. In the first step, methacrolein is produced in the same way as in the direct oxidation process by gas phase catalytic ...