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Topic: PMMA

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  Dielectric and Conductive Properties of PMMA/Single Wall Carbon
This dispersion was not observed in pure PMMA.
Because activation energy of this large dispersion is equal to activation energy of conductivity, we concluded that this dispersion is due to charge migrations of single wall carbon nanotube filler in PMMA matrix.
We concluded that PMMA chains that are attached to surfaces of f-SWNTs were immobilized.
www.nist.gov /sigmaxi/Posters04/kano.html   (299 words)

  Tangram Technology Ltd. - Polymer Data File - PMMA
PMMA is one of the earliest polymers and is well known around the world by a variety of trade names Lucite, Oroglas, Perspex and Plexiglas which vary with the country you are in.
The original PMMA was seen as a replacement for glass in a variety of applications and is currently used extensively in glazing applications.The material is one of the hardest polymers, rigid, glass-clear with glossy finish and good weather resistance.
PMMA is a glassy polymer with an amorphous structure.
www.tangram.co.uk /TI-Polymer-PMMA.html   (1129 words)

 Acrylic glass - Wikipedia, the free encyclopedia
Polymethyl methacrylate (PMMA) or poly (methyl 2-methylpropenoate) is the synthetic polymer of methyl methacrylate.
PMMA can be joined using cyanoacrylate cement (so-called "Superglue"), or by using liquid di- or trichloromethane to dissolve the plastic at the joint which then fuses and sets, forming an almost invisible weld.
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.
en.wikipedia.org /wiki/Polymethyl_methacrylate   (1110 words)

 Class II Special Controls Guidance Document: Polymethylmethacrylate (PMMA) Bone Cement; Guidance for Industry and FDA
Polymethylmethacrylate (PMMA) bone cement is a device, intended to be implanted that is made from methylmethacrylate, polymethylmethacrylate, esters of methacrylic acid, or copolymers containing polymethylmethacrylate and polystyrene.
PMMA bone cement is intended for use in arthroplastic procedures of the hip, knee, and other joints for the fixation of polymer or metallic prosthetic implants to living bone.
PMMA bone cement is contraindicated in the presence of active or incompletely treated infection, at the site where the bone cement is to be applied.
www.fda.gov /cdrh/ode/guidance/668.html   (4199 words)

 PMMA Resists - MicroChem
PMMA positive resists are based on special grades of polymethyl methacrylate designed to provide high contrast, high resolution for e-beam, deep UV (220-250nm) and X-ray lithographic processes.
In addition, PMMA is often used as a protective layer in III-V device wafer thinning applications.
Copolymer MMA (8.5) MAA is commonly used in combination with PMMA in bi-layer lift-off resist processes where independent control of CD size and shape of each resist layer is required.
www.microchem.com /products/pmma.htm   (155 words)

 Polymethyl methacrylate PMMA polymer monofilaments and fibers
PMMA is a vinyl polymer, made by free radical vinyl polymerization from the monomer methyl methacrylate.
PMMA prepared by free radical polymerization is amorphous and is therefore soluble in solvents with similar solubility parameters such as benzene, toluene, chloroform, methylene chloride, esters, ethyl acetate, and amyl acetate.
PMMA has a better resistance to hydrolysis than PMA probably by virtue of the shielding of the methyl group.
www.swicofil.com /products/278polymethylmethacrylate.html   (880 words)

 NPGS Negative PMMA   (Site not responding. Last check: 2007-11-06)
It is commonly known that when PMMA is exposed with a very high dose, it will crosslink such that it becomes a negative resist.
When PMMA is used as a negative resist, acetone can be used as the developer, so that all of the uncrosslinked resist will be removed.
Near the triangles, the proximity dose has caused the PMMA to be fully developed away (as normally happens when PMMA is exposed with a typical dose level), while the border shows the edge where the PMMA was far enough from the exposed areas such that it was not developed away.
www.jcnabity.com /negwheel.htm   (599 words)

This makes PMMA a wonderful material for making large aquariums, whose windows must be thick in order to contain the high pressure millions of gallons of water.
PMMA is a vinyl polymer, made by free radical vinyl polymerization from the monomer methyl methacrylate.
PMMA is a member of a family of polymers which chemists call acrylates, but the rest of the world calls acrylics.
www.pslc.ws /mactest/pmma.htm   (448 words)

 EPA: Federal Register: Medical Devices; Reclassification of Polymethylmethacrylate (PMMA) Bone Cement
In addition, overpressurization of the PMMA bone cement should be avoided during insertion of the PMMA bone cement and implant in order to minimize the occurrence of pulmonary embolism.
Irritation of the respiratory tract, eyes, and the liver: Caution should be exercised during the mixing of the liquid and powder components of the PMMA bone cement to prevent excessive exposure to the concentrated vapors of liquid monomer, which may produce irritation of the respiratory tract, eyes, and possibly the liver.
Disposal: Because of the volatility and flammability of the liquid monomer of the PMMA bone cement, the liquid monomer should be evaporated in a well-ventilated hood or absorbed by an inert material and transferred into a suitable container (one that does not react with the PMMA bone cement) for disposal.
www.epa.gov /fedrgstr/EPA-IMPACT/2002/July/Day-17/i18036.htm   (2439 words)

 SPIE Handbook, Volume 1: Microlithography, Section 2.7.4
The low weight PMMA is more sensitive than the top layer, so the resist develops with an enhanced undercut.
PMMA of various molecular weights dissolved in MIBK can now be purchased commercially.
In this case the higher speed of the copolymer is traded for the higher resolution of PMMA.
www.cnf.cornell.edu /cnf_spie74.html   (775 words)

 Polymethyl-methacrylate (PMMA). DermNet NZ
PMMA is a suspension of microscopic synthetic polymer beads (microspheres) in a vehicle such as bovine collagen, hyaluronic acid or some other colloidal suspending agent.
PMMA implantation can be used to improve the skin's contour and reduce depressions in the skin due to scars, injury or lines.
However, suitability for PMMA augmentation is also dependent on the vehicle that the PMMA is suspended in.
www.dermnetnz.org /procedures/pmma.html   (540 words)

 PMMA based Decorative Foils
Acrylic films are much in demand for use in building and construction applications due to their excellent scratch resistance.
For PMMA based films, colorant concentration, and compatibility with the host polymer at the set processing temperature - usually long dwell time at around 200°C - and dispersability play major roles.
We recommend that the formulator check the suitability of the colorants intended for use in the specific polymer system and conditions that are likely to be found in the end-use application.
www.cibasc.com /ind-con-app-dec-foi-pmma   (318 words)

 plexiglass - plexi - plexiglas - pmma - pvc
plexiglass - plexi - plexiglas - pmma - pvc
Le pmma (plexiglass) peut être moulé par compression, injection, coulée, soufflage et extrusion.
Ce que les scientifiques paresseux appellent PMMA, est un plastique clair, utilisé comme remplacement incassable pour le verre.
www.plexiglass.fr   (545 words)

 Forum on Safe Sex and HIV Prevention: PMMA
I am HIV+ and have had PMMA filler injjected in my face and buttocks for lipoatrophy by a very good Dr. in Rio.
I saw there is another doctor in Rio who is advertising injecting PMMA in the penis for girth enhancement.
My body has not had any negative side effects from the PMMA in my face and back side so far after 6 months.
www.thebody.com /Forums/AIDS/SafeSex/Current/Q180703.html   (518 words)

 Bioactive Bone Cement: The Solution for Osteolysis and Late Implant Loosening
Polymethylmethacrylate (PMMA) augmentation of thoracic pedicle screws doubles the initial pull out strength, however, the microscopic layer of fibrous tissue which develops at the bone/cement interface with standard PMMA may lead to late loosening and construct failure.
Dowels of either pure PMMA mixed with 20% HA or standard PMMA were surgically implanted into the proximal tibia and distal femur of each hindquarter in six sheep.
The bone/cement interfaces were evaluated to determine the density of bone within a 2mm zone around the implants and the percentage of fibrous tissue apposition around the circumference of the dowels.
www.spineuniverse.com /displayarticle.php/article2310.html   (617 words)

 PMMA iols for cataract surgery.   (Site not responding. Last check: 2007-11-06)
PMMA IOLS single piece anterior chamber intraocular lens
PMMA iols are utilized with haptics to hold the lens in place within the capsular bag.
PMMA IOLS single piece posterior chamber intraocular lens
www.eye4vision.com /pmmaiols.html   (150 words)

These new materials are cross-linked PMMA (polymethyl-methacrylate) beads which have been “internally pigmented” with a variety of materials including a wide cross-section of colored and photo-active pigments.
This allows these internally pigmented PMMA beads to be used in traditional coating processes and applications, delivering an added level of functionality and complexity not currently available in standard PMMA beads.
The size and availability of the Internally Pigmented PMMA Beads are in part based on the size of the individual pigments.
www.hwsands.com /press_releases/pr_pmma_pigmented.htm   (289 words)

 PMMA-PB Blend Study   (Site not responding. Last check: 2007-11-06)
Prior to annealing (top image sets), both the surface chemical properties and the surface mechanical properties of the PMMA and PB regions were quite different.
Consequently, the phase image contrast (see right hand image of each of the 4 image sets) between the phase-separated regions of the blend samples is large before annealing and negligible after annealing.
Nanoindentation was also utilized to follow changes in the relative stiffness of the phase-separated regions and to determine what regions of the samples were rich in PMMA and what regions were rich in PB.
www.bfrl.nist.gov /nanoscience/gallery/PMMA_PB.html   (195 words)

 What is PMMA? - PolyMethyl Methacrylate Sheets Center - Hints to build signage
PMMA sheets can be made by two technologies: cast and extruded.
PMMA Sheets can be sawn, drilled and ground with perfect results.
The sheets can be laser-cut (glossy edge) and cut by water jet (matte edge).PMMA Sheets can be bonded with very good results, both along the edge and on their surface, by using solvent adhesives and gapfilling polymerization adhesives.
www.omnexus.com /tc/pmma-sheets   (166 words)

 Project Management Maturity Assessment (PMMA) - Enterprise Information Insights, Inc. (EII)
The Project Management Maturity Assessment (PMMA) Model is a survey-based assessment designed to establish the baseline process maturity of an organization’s project management process and then the maturity level of the practice of that process.
Face-to-face one- on-one Interviews of project managers are conducted to determine the extent to which project managers are using the established project management processes.
A summary report is produced which compares the baseline process maturity levels of each of the 9 PMBOK knowledge areas against the summarized practice data.
www.eiicorp.com /pmma.cfm   (95 words)

 Polymethylmethacrylate (PMMA) products in India
PMMA offers a number of outstanding characteristics including clarity, transparency, colourability, light transmission and UV stability.
We market Lucite International’s PMMA in India under the Perspex brand name.
Impact modified PMMA is also available on request.
www.nitrexchemicals.com /products/pmma.html   (117 words)

P.M.M.A. Started out as a work in progress for an underground punk/metal clothing company by Tom Arsenault, around a week after thinking lots of stuff over Tom asked Marcus Cosh if he wanted to help out with it, Mark gladly said yes.
With a couple resurrections PMMA is currently putting on shows to make money for the recording studio and are also still looking for bands.
You can purchase merch at PMMA Concerts or the site (which should be up soon)
myspace.com /pmma   (274 words)

 Penn Regional Nanotechnology Facility
Fig (a) shows homogeneous depth distribution of gold particles with some substrate segregation, due to the preannealing process used to remove the solvent (120°C, 24hr).
After annealing at high temperature (200°C, 5hr), preferential wetting of PMMA at the surface and substrate caused redistribution of gold particles along with the PMMA phase, leading to a pseudo-trilayer formation in Fig (b).
Glancing angle technique (75° tilt of sample goniometer) was used to improve depth resolution.
www.seas.upenn.edu /nanotechfacility/apps/pmma_grafted_au.html   (143 words)

 Spartech/Polycast Medical Grade PMMA available from Modern Plastics   (Site not responding. Last check: 2007-11-06)
Spartech Polycast medical grade PMMA cast acrylic products are manufactured using Good Manufacturing Process (GMP).
All information is included at Spartech Polycast in our FDA Master File # MAF-300 and MAF-211, which is held under the custodianship of the FDA and can be issued upon request.
Download the.pdf file for more information on medical grade PMMA properties.
www.modernplastics.com /may05/wdpmma.html   (207 words)

 PMMA Contacts by Optical Polymer Research
At Contacts America we guarantee your PMMA contacts by Optical Polymer Research to be exactly as your eye doctor prescribed!
Take advantage of our discounted prices (as low as $29.99) and purchase your PMMA contact lenses online from our safe and secure web site.
Be the first to write an online review for PMMA Contact Lenses
www.contactsamerica.com /contacts/product205.asp   (457 words)

 pmma acrylic Sellers, Suppliers, Exporters, Manufacturers, Factories   (Site not responding. Last check: 2007-11-06)
Acrylic Sheet is named PMMA sheet or Organic glass sheet.
From one professional Acrylic manufacture factory Popular Design for displaying your or your lover's photo; Made of transparent Acrylic Sheet, which is made of imported PMMA material.
All the intraocular lenses are manufactured from imported PMMA with superior quality (against UV).
www.fuzing.com /qrx/pmma_acrylic   (587 words)

 Contact Lenses: PMMA
Note: If your prescription has special notes or other parameters, you can enter them in the "Special Instructions" field when you place your order.
PMMA contact lenses - the original "hard" contact lens.
If you are having any unexplained eye discomfort, watering, vision change or redness, remove your
www.lensdoc.com /Contact-Lenses/232/oxygen-permeable.html   (71 words)

ACRYPET is the trade name of Mitsubishi Rayon's acrylic resin molding compound (PMMA).The PMMA is used, among other things, for large scale molding such as display panels, bathtubs, automotive parts, household electric appliances, optical equipment, and various other fields of daily life because of the many superior properties.
Mitsubishi Rayon produces PMMA in Japan, Thailand and will start producing in China in 2003, as the first PMMA manufacturer type in China wholly owned by foreign capital.The new plant in China is hoped to start operation in the autumn of 2003.
The state-of-the-art production facilities, utilizing a continuous polymerization method with a high bulk conversion rate, will be of the world's largest scale for a single production line.
www.mrany.com /data/HTML/1.htm   (183 words)

 B I O T E C H  V I S I O N C A R E
All our PMMA Intraocular Lenses are manufactured of medical grade FDA approved Polycast polymethylmethacrylate (PMMA).
Dioptric powers are available within the ranges indicated at each model, in increments of 0.5 Dioptric steps.
The lens-haptics are made of blue, molecularly alined PMMA monofilament.
www.biotechvisioncare.com /pmma.html   (135 words)

 PMMA Contact Lenses Feed Back
We have collected a list of online contact lenses stores which are selling PMMA Contact Lenses.
We know everyone has different experiences using PMMA Contact Lenses, so your personal on PMMA Contact Lenses would be very helpful for other consumers like you.
We really appreciate your input here, and sometimes when we have enough feedback on PMMA, we may even contact the manufacturer, so they can improve their products.
www.contactlensesprice.com /PMMA_171_feedback.html   (124 words)

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