OPHTHALMIC NANOPARTICLES DRUG DELIVERY SYSTEMS (Print Ready)

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. PMMA ignites very quickly. It burns with a blue glow, even outside the flame, and crackles with white spurts. PMMA 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. PMMA is naturally transparent and colourless. The transmission for visible light is 92%. The refractive index is 1.492 for PMMA. There are types that transmit UV rays, and types that absorb it almost completely, as a result of which sensitive dyes on painted surfaces behind are protected from fading. PMMA is resistant to aliphatic hydrocarbons, cycloaliphatic compounds, fats and oils, and also to dilute acids at temperatures of up to 60oC. Chlorinated aliphatic hydrocarbons, ketones, alcohols, ethers, esters, aromatics, petrol, spirit, nitrocellulose varnishes and certain plasticisers cause PMMA to swell or produce stress cracks.  The resistance to weathering of PMMA is very good. PMMA is crystal clear and has a high surface gloss. It can be produced in all colours, transparent and muted. PMMA is odorless and tasteless and physiologically safe. PMMA or Acrylic is a versatile material and has been used in a wide range of fields and applications. PMMA has a good degree of compatibility with human tissue, and can be used for replacement intraocular lenses in the eye when the original lens has been removed in the treatment of cataracts.

Pages: 1 2 3 [4] 5 6

Add comment:

Name:
Sait link:	http://
Your message:
Enter today\\\\'s date, 2 digits (spam protection):

Popular For Cheaters Only: How to Get Over Your Affair For Cheaters Only: How to Get Over Your AffairAuthor: Doug SteponinI love my wife and I want my mistress. Does that sound disgusting, familiar, or odd? My affair wasn’t planned, of course. Like all relationships, this one was a slippery slope (in more ways than one) that spun out of control for over 3 years. I was taking a “vacation” from my commitments, responsibilities and values for a number of reasons. Like many people who have been through this, I had justified my behavior because I wasn’t happy at home, but didn’t feel it was right to divorce because of the children.

News How Ghostwriting Services Benefit Your Online How Ghostwriting Services Benefit Your OnlineAuthor: Tess TackettOther than saving you time, you may not know just exactly how many ways ghostwriting services can benefit your online business.  You know that it's great if you don't have time to write content yourself, or just really are not that great a writer.  How else can it help you?  There are many ways, which we will discuss in this article. Many ghostwriters are very knowledgeable about SEO tactics.  They understand that in order to benefit their clients most, the content they write must be compelling to their readers, as well as optimized for specific keywords so that the search engines will find it.  When you find someone that can write in a way that covers both bases, it means great strides in terms of traffic and search engine ranking.