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Some of these chemistries are polyether, polyester, [6] polycarbonate [7] [8] and also acrylic polyols. [9] [10] Polyether polyols may be further subdivided and classified as polyethylene oxide or polyethylene glycol (PEG), polypropylene glycol (PPG) and Polytetrahydrofuran or PTMEG. These have 2, 3 and 4 carbons respectively per oxygen atom in ...
They can be converted to polyether polyols by co-polymerizing ethylene oxide and propylene oxide with a suitable polyol precursor. [19] Polyester polyols are made by the polycondensation of multifunctional carboxylic acids and polyhydroxyl compounds. They can be further classified according to their end use.
A polyester shirt Close-up of a polyester shirt SEM picture of a bend in a high-surface area polyester fiber with a seven-lobed cross section A drop of water on a water resistant polyester Polyesters can contain one ester linkage per repeat unit of the polymer, as in polyhydroxyalkanoates like polylactic acid , or they may have two ester ...
In the context of textile applications, PET is referred to by its common name, polyester, whereas the acronym PET is generally used in relation to packaging. [citation needed] Polyester makes up about 18% of world polymer production and is the fourth-most-produced polymer after polyethylene (PE), polypropylene (PP) and polyvinyl chloride (PVC).
polyester-based TPUs (mainly derived from adipic acid esters) polyether-based TPUs (mainly based on tetrahydrofuran (THF) ethers ). The differences between these two groups are outlined in the table below.
Elastolefin is a fiber used in fabrics. [16] IKEA's Better Shelter uses structural panels made out of polyolefin foam, stating, "They are tough and durable.". [17] Piping systems for the conveyance of water, chemicals or gases are commonly produced in Polypropylene, and to a much greater extent Polyethylene. Piping systems in high-density ...
Blue Pure 311i Max is the top-of-the-line model out of the half-dozen or so Blue Air purifiers available. The tallest (14.4" wide x 14.4" deep x 22.7" tall) in our round-up and with a premium grey ...
The term polyol generally refers to polyether polyols with one or more functional end-groups such as a hydroxyl group. The term "oxide" or other terms are used for high molar mass polymer when end-groups no longer affect polymer properties. Crown ethers are cyclic polyethers.
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