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POLY(METHYL METHACRYLATE)

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CAS:9011-14-7
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POLY(METHYL METHACRYLATE) Basic information
Overview Production method Physicochemical properties Application References
Product Name:POLY(METHYL METHACRYLATE)
Synonyms:POLY(METHYL METHACRYLATE), AVERAGE MW CA . 15,000 (GPC);POLY(METHYL METHACRYLATE), AVERAGE M.W. 120,000;POLY(METHYL METHACRYLATE) STANDARD 50'00 0;POLY(METHYL METHACRYLATE) STANDARD 10'00 0;MALDI VALIDATION SET POLY(METHYL METHA-C RYLATE) CERTIFIED;POLY(METHYL METHACRYLATE) STANDARD 2'000;POLY(METHYL METHACRYLATE) STANDARD 500'0 00;POLY(METHYL METHACRYLATE) STANDARD 800'0 00
CAS:9011-14-7
MF:C15H24O6X2
MW:300.35
EINECS:618-466-4
Product Categories:Acrylics;Contact Printing;Dielectric Materials;Hydrophobic Polymers;Materials Science;Methacrylate Polymers;Micro/NanoElectronics;Microcontact Printing;Organic and Printed Electronics;Organic Field Effect Transistor (OFET) Materials;PMMA-Based Resins;Polymer Science;Self Assembly &;Stamps for Nanoprint Lithography &;-;Polymers
Mol File:9011-14-7.mol
POLY(METHYL METHACRYLATE) Structure
POLY(METHYL METHACRYLATE) Chemical Properties
Melting point 150 °C
density 1.188 g/mL at 25 °C
refractive index n20/D 1.49
Fp 250 °C
storage temp. 2-8°C
solubility alcohols and aliphatic hydrocarbons: insoluble
form powder
color White
Specific Gravity1.188
Water Solubility Soluble in tetrahydrofuran, toluene, cyclohexanone, ethyl acetate and chloroform. Insoluble in water, alcohols and aliphatic hydrocarbons.
Stability:Stable. Combustible. Incompatible with strong oxidizing agents.
CAS DataBase Reference9011-14-7
Safety Information
Hazard Codes Xn
Risk Statements 20/22
Safety Statements 36-24/25-22
WGK Germany 3
RTECS TR0400000
Autoignition Temperature580 °F
TSCA Yes
HS Code 39061000
MSDS Information
ProviderLanguage
SigmaAldrich English
ACROS English
ALFA English
POLY(METHYL METHACRYLATE) Usage And Synthesis
OverviewPoly (methyl methacrylate) (PMMA), having the IUPAC name of poly [1-(methoxy carbonyl)- 1-methyl ethylene] from the hydrocarbon standpoint, and poly (methyl 2-methylpropenoate) from the ester standpoint, is a synthetic polymer from the methyl methacrylate monomer as illustrated in Figure 1.[1] PMMA was discovered in the early 1930s by British chemists, Rowland Hill and John Crawford, followed by its first application by a German chemist, Otto Rohm, in 1934.[2] PMMA is an optically clear (transparent) thermoplastic, and it is widely used as a substitute for inorganic glass, because it shows high impact strength, is lightweight, shatter-resistant, and exhibits favorable processing conditions.[3] Outstanding properties include weather resistance and scratch resistance. The presence of the adjacent methyl group (CH3) in the polymer structure prevents it from packing closely in a crystalline fashion, and from rotating freely around the C-C bonds. This is why PMMA was found to be an amorphous thermoplastic. The first major application of the polymer took place during World War II, when PMMA was used as aircraft windows and bubble canopies for gun turrets.

Figure 1 the chemical structure of PMMA; PMMA is a promising polymer for applications in optical, pneumatic actuation, sensor, analytical separation, and conductive devices.[4–8] Other applications include the use of PMMA in biomedical applications, polymer electrolytes, polymer viscosity, and drug delivery using electro-diffusion or electro-osmotic flow.[9–13] Due to its compatibility and easy processing as a polymer moiety, PMMA with carbon nanotubes or other inorganic materials plays an important role in the development of nanotechnology. Wang et al., in the preparation of carbon nanotube polymer composites, used poly (styrene-co-acrylonitrile) with poly (methyl methacrylate)-g-multi walled carbon nanotubes.[14]
Production methodPMMA can be obtained from its monomer using different techniques of polymerization. The monomer undergoes polymerization using the common methods of free radical and anionic initiations by bulk, solution, suspension, and emulsion techniques. [15] Following the discovery of a new technique of polymerization by Krzysztof Matyjaszewski in 1995[16] called Atom Transfer Radical Polymerization (ATRP), Matyjaszewski et al. successfully polymerized the monomer of methyl methacrylate (MMA) to produce PMMA as a living polymer with 80% conversion, poly-dispersity as low as 1.1, and an Mn of 20,000 in a few hours.[17]
Physicochemical propertiesPMMA is one of the amorphous polymers that belong to the acrylate family. It is a clear, colorless polymer with a glass transition temperature range of 100 degree to 130 degree, and a density of 1.20 g/cm3 at room temperature. This polymer melts at 130 degree, with a water absorptivity of 0.3%, moisture absorption at equilibrium of 0.3 to 0.33%, and a linear shrinkage mold of 0.003 to 0.0065 cm/cm[18-20].
PMMA is among the polymers that have high resistance to sunshine exposure because it has a small variation under the effect of UV-radiation. It has very good thermal stability, and is known to withstand temperatures as high as 100 degree and as low as 70 degree.
It also possesses very good optical properties, with a refractive index of 1.490, and a good degree of compatibility with human tissue.[18, 19]
PMMA is an organic polymer, and its solubility is expected to be governed by “like-dissolve-like,” with polarity playing a major role. PMMA shows little deviation, as its solubility is more complex, starting with swelling in the solvent and the subsequent formation of a very soft layer on its surface. This is then followed by diffusion of the solvent into the whole polymer before it gives a homogenous solution with the solvent. This is the reason why PMMA takes a few minutes before it is dissolved completely, even if it is in its best solvent.
PMMA hydrolyzed completely with sulfuric acid (H2SO4) to become poly (methacrylic acid) (PMAA). Hydrochloric acid and hydro-iodic acid are capable of hydrolyzing PMMA, but at a slow rate when compared to sulfuric acid[21]. PMMA has a predominantly elemental composition of carbon and hydrogen. Therefore, it is liable to undergo an exothermic combustion reaction to yield gaseous products (CO2, CO, H2O,) and energy like any other hydrocarbon. The thermal decomposition of PMMA has been extensively studied in the absence of oxygen. The decomposition temperature varies, depending on the approach used in the synthesis of the polymer. Radically polymerized PMMA containing terminal C-C bonds decompose at a temperature of 220 degree with simple mechanisms of monomer repeat units bond scission and C-C bond random scission [18].
ApplicationBiomedical
PMMA has been used in the area of biomedical applications, which involves the preparation of bone cements for drug delivery/release and cranioplasty. The qualities that made the polymer a potential material for these applications include: non-toxicity, less cost, easy processability, compatibility, minimal inflammatory reactions with tissues, and greater fracture resistance, especially when used in cranioplasty.
PMMA has also been used to widen the applications of chitosan in various fields that include biomedical and pharmaceutical applications. Zuhair et al. reported the successful grafting of a PMMA/chitosan blend. The results indicated an increase in the mechanical properties, such as tensile strength and flexural modulus. The degradation, porosity, and water absorbency of the blend in synthetic body fluid (SBF) with a pH of 7.4 increased with an increase in the chitosan percentage and immersion time in SBF. These behaviors exhibited by the PMMA/chitosan blend illustrate its potentials for drug release applications[22].
Molecular Separation
Molecular separations in chemistry can be achieved in an advanced way by the use of chromatographic techniques, which involve the use of a stationary phase (inert solid support) and mobile phase (usually solvent or mixture of solvents). The common solid supports used are inorganic materials such as silica and alumina, but they have low patronage due to their disadvantages in separating some organic molecules, and limited modifications for maximum efficiency. Therefore, both natural and synthetic polymers have recently been used to replace the inorganic materials. PMMA is the most promising synthetic polymer for applications in molecular separation due to its low cost, compatibility, ease of modification, and processability[7, 23].
Optical applications
Optical science is relevant and studied in many disciplines, including engineering, medicine, pure science, and astronomy. Practical applications are found in lenses, microscopes, lasers, fibers, and polymers, to name a few. The optical activity of any material is the result exhibited by that material when interacting with light and the refractive index is the measure of that activity. The optical applications of PMMA are due to its refractive index, good resistance to UV light, chemical durability, and good mechanical properties.
Organic polymers are usually cheap, lightweight, and easily processed substrates, and are therefore good for immobilizing semiconductors for heterogeneous photocatalytic applications. Camara et al. revealed the investigation of eleven synthetic polymers susceptible to coating with TiO2 for exposure to solar radiation, with and without the TiO2 layer, for 150 days to study the weathering. They observed that only the PMMA retains good optical and mechanical properties of the Titania after natural weathering. Therefore, PMMA is the best candidate for the immobilization of TiO2 for photocatalytic treatment applications[24].
Polymer conductivity and electrolytes
Most polymers are electrical insulators. However, conducting polymers can be prepared using an insulating polymer and electrically conductive fillers called dopants. The electrical properties of PMMA doped with conducting materials under various experimental conditions including photo-induced changes, has been studied. PMMA was used as an organic insulator, while the PVA-PAA-glycerol was a semiconducting polymer. Aluminum electrodes were used as bottom and top electrodes for the fabricated devices. Finally, organic memory devices were prepared based on the Au-PtAg nanoparticles as charge storage elements. Herein, PMMA was used as the organic insulator[25].
A polymer electrolyte membrane for battery application must play the following roles: must enable positive ion transport such as Li+ between the electrodes, must block the electron transport, and must be rigid to prevent direct contact between the electrodes[26]. The application of PMMA in the polymer electrolyte was due to the amorphous nature for porosity’s sake and the mechanical strength it has for the provision of the rigidity to the polymer electrolyte membrane.
Sensor application
In search of the production of a quasi-solid-state dye-sensitized solar cell (DSSC) using a high conductivity polymer gel electrolyte, a suitable polymeric material was needed to be a host matrix in the composite. Therefore, PMMA was found to be a good and compatible polymer for this purpose. This was attributed to its mechanical strength, compatibility, and optical clarity[27].
Solar and nanotechnology applications
Due to the wider application of nanocomposites in the field of nanotechnology, many researchers focused their attention on nanocomposites, their fabrication, and applications. Perween et al. reported the use of PMMA and graphite to fabricate plastic chip electrodes (PCEs) via a simple solution casting method. This characterization was made using microscopy (SEM and AFM) as well as thermal properties (TGA), and mechanical and electrical properties. The fabricated electrode was economically inexpensive, multipurpose, and dispensable for various applications[28].
References
  1. Malcom, P.S. Polymer Chemistry: An Introduction. 3rd ed.; Oxford University Press: NY, pp 167–176, 256–276.
  2. Henri, L. Thermohygroelastic Properties of Polymethylmethacrylate; 2007, Netherlands. pp. 11–13.
  3. Demir, M. M.; Memesa, M.; Castignolles, P.; Wegner, G. Macromolecular Rapid Communications. 2006, 27 (10), 763–770.
  4. Hashim, H.; Adam, N. I.; Zaki, N.H.M.; Mahmud, Z.S.; Said, C.M.S.; Yahya, M.Z.A.; Ali, A.M.M. Conference on Science and Social Research 2010 (CSSR 2010), Kuala Lumpur, Malaysia, 485–488.
  5. Henry, A.C.; Tutt, T.J.; Galloway, M.; Davidson, Y.Y.; McWhorter, C.S.; Soper, S.A.; McCarley, R.L. Analytical Chemistry 2000, 72(21), 5331–5337.
  6. Lee, L.H.; Chen, W.C. Chem. Mater. 2001, 15, 1137–1142.
  7. Shah, J. J.; Geist, J.; Locascio, L. E.; Gaitan, M.; Rao, M. V.; Vreeland, W. N. “Surface modification of poly(methyl methacrylate) for improved adsorption of wall coating polymers for microchip electrophoresis”, Electrophoresis 2006, 27(19), 3788–3796.
  8. Adhikari, B.; Majumdar, S. “Polymers in sensor applications”, Progress in Polymer Science 2004, 29(7), 699–766.
  9. Isha, A.; Yusof, N.A.; Ahmad, M.; Suhendra, D.; Yunus, W.M.Z.W.; Zainal, Z. Sensors and Actuators B: Chemical. 2006, 114(1), 344–349.
  10. Kost, J.; Langer, R. “Responsive polymeric delivery systems”, Advanced Drug Delivery Reviews. 2012, 64, 327–341.
  11. Beruto, D.T.; Botter, R.; Fini, M. Biomaterials. 2002, 23(12), 2509–2517.
  12. Shi, M.; Kretlow, J.D.; Spicer, P.P.; Tabata, Y.; Demian, N.; Wong, M.E.; Kasper, F.K.; Mikos, A.G. Journal of Controlled Release 2011, 152(1), 196–205.
  13. Mishra, S.; Sen, G. International Journal of Biological Macromolecules. 2011, 48(4), 688–694.
  14. Wang, M.; Pramoda, K.P.; Hong, S. Polymer 2005, 46, 11510–11516.
  15. George, O. Principles of Polymerization, 4th ed.; Wiley: NJ, 2004, pp 198–235.
  16. Wang, J.-S.; Matyjaszewski, K. Journal of the American Chemical Society. 1995, 117(20), 5614–5615.
  17. Grimaud, T.; Matyjaszewski, K. Macromolecules. 1997, 30(7), 2216–2218.
  18. Charles, A.H.; Edward, M.P. Plastics Materials and Processes, in Concise Encyclopedia; Wiley: NJ, 2003, pp. 42–44.
  19. Van Krevelen, D.W.; Nijenhuis, K. T. Properties of Polymers; Elsevier: Amsterdam, 2000, pp. 106, 322.
  20. Charles, A.H. Handbook of Plastics Processes; Wiley: NJ, 2006, pp. 1–7.
  21. Ishitake, K.; Satoh, K.; Kamigaito, M.; Okamoto, Y. Polymer Chemistry. 2012, 3(7), 1750–1757.
  22. Zuhair, J.; Abdul Amer, J.K.A.; Sura Fahim, A. “Chitosan/PMMA bioblend for drugs release applications”, International Journal of Engineering and Technology 2014, 4(5), 318–324.
  23. Tai, Y.; Wang, L.; Gao, J.; Amer, W.A.; Ding, W.; Yu, H. Journal of Colloid and Interface Science. 2011, 360(2), 731–738.
  24. Camara, R.M.; Portela, R.; Gutierrez-Martin, F.; Sanchez B. Global NEST Journal 2014, 6(3), 525–535.
  25. Haik, M.Y.; Ayesh, A.I.; Abdulrehman, T.; Haik, Y. Materials Letters. 2014, 124(0): 67–72.
  26. Hallinan, D.T.; Balsara, N.P. Polymer Electrolytes, in Annual Review of Materials Research, Vol 43, D.R. Clarke, Ed.; 2013, pp. 503–525
  27. Shen, J.; Li, Z.; Cheng, R.; Luo, Q.; Luo, Y.; Chen, Y.; Chen, X.; Sun, Z.; Huang, S. ACS Applied Materials & Interfaces 2014, 6(20), 17454–17462.
  28. Perween, M.; Parmar, D.B.; Bhadu, G.R.; Srivastava, D.N. “Polymer-graphite composite: a versatile use and throw plastic chip electrode”, Analyst 2014, 139(22), 5919–5926.
Chemical Propertieswhite powder (or clear plastic sheet)
DefinitionChEBI: A macromolecule composed of repeating methyl methacrylate units.
Safety ProfileQuestionable carcinogen with experimental tumorigenic data by implant route. When heated to decomposition it emits acrid smoke and irritating fumes. Used as the main constituent of acrylic sheet, moldmg, and extrusion powders.
POLY(METHYL METHACRYLATE) Preparation Products And Raw materials
Preparation ProductsAcetone cyanohydrin -->Zirconium dioxide -->antimony pentoxide sol-->Plastic products-->KAPPA-SELENOCARRAGEENAN
Raw materialsMethacrylic acid-->Methyl methacrylate
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