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In extrinsic systems, the healing chemistries are separated from the surrounding polymer in microcapsules or vascular networks which, after material damage/cracking, release their content into the crack plane, reacting and allowing the restoration of material functionalities. [57] These systems can be further subdivided in several categories.
Moisture cured polyurethane–urea coatings have been made by reacting 1,2,3-triazole rich polyether polyols with HMDI at NCO/OH eq. ratio of 1.2 to obtain isocyanate-terminated polyurethane prepolymers. The prepolymers were cured under atmospheric moisture to make polyurethane–urea free films.
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Polyurethane dispersion, or PUD, is understood to be a polyurethane polymer resin dispersed in water, rather than a solvent, although some cosolvent may be used.Its manufacture involves the synthesis of polyurethanes having carboxylic acid functionality or nonionic hydrophiles like PEG (polyethylene glycol) incorporated into, or pendant from, the polymer backbone. [1]
Polyurethane laminate (PUL, thermal stretch, [1] fuzzy rubber [1]) is a compound fabric made by laminating a cloth fabric to one or both sides of a thin film of polyurethane. [ 1 ] [ 2 ] Polyurethane laminated fabrics have a wide range of applications in medical, automotive and garment uses.
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The two components are referred to as a polyurethane system, or simply a system. The isocyanate is commonly referred to in North America as the 'A-side' or just the 'iso'. The blend of polyols and other additives is commonly referred to as the 'B-side' or as the 'poly'. [citation needed] This mixture might also be called a 'resin' or 'resin ...
Polyurea and polyurethane are copolymers used in the manufacture of spandex, which was invented in 1959. Polyurea was originally developed in automotive applications in the 1980s [ 2 ] [ 3 ] but other applications such as protecting tabletop edges followed. [ 4 ]