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Polymethyl methacrylate (pmma)
PMMA, or polymethyl methacrylate, is a transparent rigid thermoplastic that is a lightweight alternative to glass. It is produced by polymerizing methyl methacrylate monomers. PMMA has excellent clarity, UV resistance, abrasion resistance, hardness, stiffness, and low water absorption. However, it has poor impact resistance, limited chemical resistance, and limited heat resistance. PMMA has various uses in medical, construction, lighting, automotive, electronics, and furniture industries. It is 100% recyclable and used in applications like bone cement, dental prosthetics, and remodeled bones in orthopedics.
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Polymethyl methacrylate (pmma)
- 1. POLYMETHYL METHACRYLATE (PMMA) BY – RANASAHA B.PHARM. 4TH YEAR
- 2. INTRODUCTION PMMA, Polymethylmethacrylate (C5O2H8)n , polymer of methyl methacrylate, is a transparent rigid thermoplastic (often used in sheet form as a lightweight or shatter-resistant alternative to glass. ). It is also known as acrylic, acrylic glass, or plexiglass as well as by the trade names Crylux, Plexiglas, Acrylite, Lucite, and Perspex. PMMA or poly (methyl 2‐methylpropenoate) is produced from monomer methyl methacrylate
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- 4. PROPERTIES OF PMMA Transmittance UVStability Surface Hardness Chemical Resistance
- 5. ADVANTAGES OF PMMA Excellentclarity UV resistant Good abrasion resistant Hardness and stiffness is good. Low water absorption Flamable, but has low smoke emission Good track and arc resistant
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- 7. LIMITATIONS OF PMMA Poorimpact resistance UVLimited chemical resistance, prone to attack organic solvents Stability Limited heat resistance (80°C) Cracking under load possible Poor wear and abrasion resistance
- 8. USES OF PMMA Medicaland Healthcare Architecture and Construction Lighting Automotive and Transportation Electronics Furniture
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- 11. MEDICAL USES OFPMMA In orthopaedics, as bone cement Used to affix implant Used to remodel lost bones Used as sealing agents in dentistry Used in dental prosthesis
- 12. RECYCLABILITY OF PMMA Polymethyl methacrylate is highly biocompatible, 100% recyclable and non-biodegradable material. PMMA is considered as a group 7 plastic. There are several ways to recycle PMMA. Often these recycling processes involve pyrolysis, in which the PMMA is extremely heated in the absence of oxygen. Another procedure involves depolymerization of PMMA using molten lead to obtain the monomer MMA in a purity >98%.
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