OPHTHALMIC NANOPARTICLES DRUG DELIVERY SYSTEMS

The material was developed in 1928 in various laboratories and was brought to market in 1933 by Rohm and Haas Company. Trade names: Plexiglas, Vitroflex, Limacryl, R-Cast, Per-Clax, Perspex, Plazcryl, Acrylex, Acrylite, Acrylplast, Altuglas, Polycast, Oroglass and Lucite and is commonly called acrylic glass, simply acrylic or plexiglas.Other names:  Methyl Methacrylate resinPHYSICAL AND MECHANICAL PROPERTIESGeneral physical properties PMMA is a glassy polymer with an amorphous structure. It has a density of 1.19 g/cm3 and has very low water absorption. The refractive index ranges from 1.49 to 1.51 depending on the type. Mechanical properties Thermal properties Parts made of PMMA have high mechanical strength and good dimensional stability. PMMA is one of the hardest thermoplastics and is also highly scratch resistant.THERMAL, ELECTRICAL AND OPTICAL PROPERTIESHeat-stabilized types can withstand temperatures of up to 100oC. PMMA can withstand temperatures as low as - 70oC. Resistance to temperature changes is very good. Glass transition temperature of PMMA is in the range of 100-1200C. Fire behavior PMMA ignites very quickly. It burns with a blue glow, even outside the flame, and crackles with white spurts. ·  Electrical propertiesPMMA has good insulating properties, a high dielectric strength and high tracking resistance. The relatively high surface resistance, however, encourages electrostatic charges on the surface of moulded parts; this can be largely overcome by the use of antistatic agents. Optical properties PMMA is naturally transparent and colourless.

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03.12.2009

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