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Polyols may be classified according to their chemistry. [5] 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.
Textile fibres or textile fibers (see spelling differences) can be created from many natural sources (animal hair or fur, cocoons as with silk worm cocoons), as well as semisynthetic methods that use naturally occurring polymers, and synthetic methods that use polymer-based materials, and even minerals such as metals to make foils and wires.
This page was last edited on 11 January 2025, at 20:40 (UTC).; Text is available under the Creative Commons Attribution-ShareAlike 4.0 License; additional terms may apply.
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 ...
Alkoxylation is a chemical reaction that involves the addition of an epoxide to another compound. The usual manifestation of this reaction is ethoxylation of alcohols (ROH), in which case ethylene oxide is the alkoxylating agent:
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.
They are produced by reacting either ethylene oxide or propylene oxide with polyols and then aminating them. There are a number of commercially available molecules with different CAS numbers and molecular weights. They often come with a prefix of M, D or T for monofunctional, difunctional and trifunctional respectively.
Quilting templates/patterns come in many varieties and are generally considered the basis of the structure of the quilt, like a blueprint for a house. Bias binding or bias tape can be made from strips of quilt fabric or purchased as quilt binding. It is used in the last stage of making a quilt, and is a method of covering the edges of the quilt.
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