Abstract
Heat resistant and transparent polyurethane has the characteristics of high optical performance, heat resistance and mechanical properties, which is one of the important research directions of heat resistant and transparent polymer materials in recent years. In this study, aimed at the introduction of research progress about transparent polyurethane, the synthesis technology of transparent polyurethane and the shortcomings of the polyurethane material were proposed and the synthesis technology and development direction of heat resistant and transparent polyurethane material were put forward.
Highlights
Polyurethane (PU) is a kind of high molecular compound containing more carbamate
Heat resistant transparent polyurethane has the advantages of optical transparency, heat resistance and chemical resistance
Extensive studies have been done in the references to improve the properties of polyurethane, Moncur et al (1999) proposed using aliphatic isocyanate, non fluorinated polyol, aliphatic fluoro alcohol to prepare transparent fluorinated polyurethane, the high fluorine content would decrease the mechanical properties of polyurethane and the cost is very high
Summary
Polyurethane (PU) is a kind of high molecular compound containing more carbamate. Its unique chain structure and aggregation structure give it with excellent physical properties and processing performance, so it can be widely used in architectural coatings, optical materials, functional materials and other fields. Slagel (1975) proposed to prepared high performance transparent polyurethane as bulletproof protection material, it adopts polyester or polyether and aromatic amine isocyanate reaction of preparing prepolymer, but amine curing agent weather is not good, light dark, reducing the transparency of it. Tamura et al (2007) proposed to colorless amines as chain extender of preparation as the lens transparent polyurethane, but it became yellow under high temperature, affecting the optical properties. Solutions include that: Selection of raw materials with asymmetric structure; Rational design and synthesis process, improve the mixing degree of soft and hard segment; Increase the degree of the chemical crosslinking of polyurethane by increasing the degree of the chain extension agent; Hybrid inorganic materials and organic polymer materials
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