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The Sơn Vi culture is the name given to a culture of the late Palaeolithic and early Mesolithic Age in Vietnam. [1] [2] Sơn Vi itself is a village (xã) in Lâm Thao District, Phú Thọ Province. Sơn Vi is the official Chinese character tên chữ name of the village, it also has a demotic Vietnamese tên nôm name, kẻ Vây. [3]
Tiên sinh - used to refer to a (male) gentleman, educated person, teacher, master. [8] tiền bối - used to refer to an older and experienced honorable person or a predecessor of particular field. Example: Các bậc tiền bối trong phong trào Cách mạng. (Old Vanguards of the Revolution.)
Vinyl polymers are subject of several structural variations, which greatly expands the range of polymers and their applications. With the exception of polyethylene, vinyl polymers can arise from head-to-tail linking of monomers, head-to-head combined with tail-to-tail, or a mixture of those two patterns. Additionally the substituted carbon center in such polymers is stereogenic (a "chiral center")
Polysulfone (PSU) repeating unit. Polyethersulfone (PES) repeating unit. Polysulfones are a family of high performance thermoplastics.These polymers are known for their toughness and stability at high temperatures.
Vinylsulfonic acid is produced industrially by the alkaline hydrolysis of carbyl sulfate with subsequent acidification of the resulting vinyl sulfonate salt: [6]. The reaction is highly exothermic (reaction enthalpy: 1,675 kJ/kg) and requires exact maintenance of temperature and pH during the hydrolysis.
The generalised chemical structure of polyisocyanurate showing the isocyanurate group. The polyols are abbreviated as R-groups.. Polyisocyanurate (/ ˌ p ɒ l ɪ ˌ aɪ s oʊ s aɪ ˈ æ nj ʊər eɪ t /), also referred to as PIR, polyol, or ISO, is a thermoset plastic [1] typically produced as a foam and used as rigid thermal insulation.
PVP is also used in many technical applications: as a special additive for batteries, ceramics, fiberglass, inks, and inkjet paper, and in the chemical-mechanical planarization process
3D structure of cellulose, a beta-glucan polysaccharide Amylose is a linear polymer of glucose mainly linked with α(1→4) bonds. It can be made of several thousands of glucose units.