5/27/2023 0 Comments Dndc of pmma in dmf![]() ![]() The actual quantity depends on the requirements for quality. In some cases, the utilization of recycled materials can reach 100%. Dying temperature is 80-90 Celsius degree and drying time is 3 hours or above. The presence of moisture makes the melt bubbles, gas lines, and low transparency. The injection molding moisture must be less than 0.1%. PMMA has a certain degree of water absorption of 0.3-0.4%. PMMA is an amorphous polymer, the melt temperature is above 160 Celsius degree and the decomposition temperature can reach 270 Celsius degree. In molding, it changes the melt viscosity mainly from the injection temperature. The fluidity of PMMA is poorer than that of PS, ABS and its melt viscosity is rather sensitive to the change of temperature. If you add a small amount of nitrile rubber (about 50%) in the 372 PMMA, it will become 373 PMMA. 372 PMMA is the copolymer of methyl methacrylate and styrene. ![]() PMMA has some defects such as low surface hardness, easy to snag, low impact resistance, poor molding liquidity performance, so PMMA’s modification appears one after another such as copolymerization between methyl methacrylate and styrene and butadiene, a blend of PMMA and PC, etc. PMMA is commonly known as polymethyl methacrylate, acrylic and so on and its chemical name is polymethyl methacrylate. Injection Molding Technology of Polymethyl Methacrylate (PMMA)
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