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[Chemical Knowledge]：What are the upstream raw materials of PMMA? What do the downstream products contain?

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Polymethyl methacrylate (PMMA) is a transparent, high-performance plastic material, widely used in the field of chemical production raw materials. Its upstream and downstream related products mainly include raw materials, monomers, copolymers, modified materials and so on.

1. upstream associated products

1. Methyl methacrylate (MMA) monomer: PMMA is made from methyl methacrylate (MMA) monomer through polymerization. Therefore, the quality and price of MMA monomer have an important influence on the production of PMMA.
2. Initiator: The polymerization reaction requires an initiator to start. Commonly used initiators are benzoyl peroxide, azobisisobutyronitrile, etc.
3. Polymerization inhibitor: During the storage and transportation of MMA monomer, in order to prevent its self-polymerization, it is necessary to add a polymerization inhibitor. Commonly used inhibitors include hydroquinone, hydroquinone, etc.

2. downstream related products

1. Modified PMMA: In order to further improve the performance of PMMA, it can be modified. Common modification methods include adding toughening agents, heat-resistant agents, anti-ultraviolet agents, etc.
2. PMMA copolymer: PMMA copolymer with special properties can be prepared by copolymerization with other monomers. For example, copolymerization with styrene can give copolymers with high impact properties.
3. PMMA composite materials: PMMA and other materials can be combined to produce composite materials with excellent properties. For example, a composite material having high strength and high rigidity can be obtained by combining PMMA with glass fibers.

In short, the upstream and downstream related products of polymethyl methacrylate are very rich, and their applications are also very extensive. With the continuous development of science and technology, the types and performance of PMMA and its related products will be further expanded and improved.

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