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Dichloromethane Manufactor Polyurethane (PU) CAS 51852-81-4 China Best Price – Chemwin Detail:

Product Name:polyurethane

Product molecular structure:

polyurethane

 

Chemical Properties: 

Polyurethanes were first produced and investigated by Dr. Otto Bayer in 1937. Polyurethane is a polymer in which the repeating unit contains a urethane moiety. Urethanes are derivatives of carbamic acids that exist only in the form of their esters[15]. The major advantage of PU is that the chain is not composed exclusively of carbon atoms but rather of heteroatoms, oxygen, carbon and nitrogen[4]. For industrial applications, a polyhydroxyl compound can be used. Similarly, poly-functional nitrogen compounds can be used at the amide linkages. By changing and varying the polyhydroxyl and polyfunctional nitrogen compounds, different PUs can be synthesized[15]. Polyester or polyether resins containing hydroxyl groups are used to produce polyesteror polyether-PU, respectively[6]. Variations in the number of substitutions and the spacing between and within branch chains produce PUs ranging from linear to branched and 9exible to rigid. Linear PUs is used for the manufacture of fibers and molding[6]. Flexible PUs is used in the production of binding agents and coatings[5]. Flexible and rigid foamed plastics, which make up the majority of PUs produced, can be found in various forms in industry[7]. Using low molecular mass prepolymers, various block copolymers can be produced. The terminal hydroxyl group allows for alternating blocks, called segments, to be inserted into the PU chain. Variation in these segments results in varying degrees of tensile strength and elasticity. Blocks providing rigid crystalline phase and containing the chain extender are referred to as hard segments[7]. Those yielding an amorphous rubbery phase and containing the polyester/polyether are called soft segments. Commercially, these block polymers are known as segmented Pus

 

Application:

Polyurethanes are one of the most versatile materials in the world today. Their many uses range from flexible foam in upholstered furniture, to rigid foam as insulation in walls, roofs and appliances to thermoplastic polyurethane used in medical devices and footwear, to coatings, adhesives, sealants and elastomers used on floors and automotive interiors[17,18]. Polyurethanes have increasingly been used during the past thirty years in a variety of applications due to their comfort, cost benefits, energy savings and potential environmental soundness. What are some of the factors that make polyurethanes so desirable? Polyurethane durability contributes significantly to the long lifetimes of many products. The extensions of product life cycle and resource conservation are important environmental considerations that often favor the selection of polyurethanes[19-21]. Polyurethanes (PUs) represent an important class of thermoplastic and thermoset polymers as their mechanical, thermal, and chemical properties can be tailored by the reaction of various polyols and poly-isocyanates.


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The key to our success is Good Product Quality, Reasonable Value and Efficient Service for Dichloromethane Manufactor Polyurethane (PU) CAS 51852-81-4 China Best Price – Chemwin , The product will supply to all over the world, such as: Pakistan, Angola, Naples, We have been in operation for more than 10 years. We are dedicated to quality products and consumer support. We currently own 27 product utility and design patents. We invite you to visit our company for a personalized tour and advanced business guidance.
  • We are old friends, the company's product quality has been always very good and this time the price is also very cheap.
    5 Stars By Odelia from Slovakia - 2017.03.08 14:45
    The company has a good reputation in this industry, and finally it tured out that choose them is a good choice.
    5 Stars By Diana from Los Angeles - 2017.12.19 11:10
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