Search results
Results from the WOW.Com Content Network
In organic chemistry, a polyol is an organic compound containing multiple hydroxyl groups (−OH). The term "polyol" can have slightly different meanings depending on whether it is used in food science or polymer chemistry. Polyols containing two, three and four hydroxyl groups are diols, [1] triols, [2] and tetrols, [3] [4] respectively.
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.
Polyols for flexible applications use low functionality initiators such as dipropylene glycol ... Liquid resin blends and isocyanates may contain hazardous or ...
Relevant to resins, pentaerythritol is a precursor to other polyol, such as dipentaerythritol: [8] 2 C(CH 2 OH) 4 → O[CH 2 C(CH 2 OH) 3] 2 + H 2 O. Esters of pentaerythitol are biodegradable, [9] [10] and they are used as transformer oils. [11] Due to a very high flash point they also find some use in lubricating gas turbines. [12]
Its major application is its use for the production of polyether polyols for use in making polyurethane plastics. It is a chiral epoxide, although it is commonly used as a racemic mixture. This compound is sometimes called 1,2-propylene oxide to distinguish it from its isomer 1,3-propylene oxide, better known as oxetane.
MDI reacts with polyols in the manufacture of polyurethane. It is the most produced diisocyanate, accounting for 61.3% of the global market in the year 2000. It is the most produced diisocyanate, accounting for 61.3% of the global market in the year 2000.
A printer cartridge made of PPE and polystyrene; it is an example of a product which requires good dimensional stability and accuracy to fit.. PPE blends are used for structural parts, electronics, household and automotive items that depend on high heat resistance, dimensional stability and accuracy.
Polyolester of pentaerythritol Polyolester of di-pentaerythritol. Polyolester oil (POE oil) is a type of wax-free synthetic oils used in refrigeration compressors that is compatible with the refrigerants R-134a, R-410A, and R-12. [1]