Poly(methacrylic acid)

• Catalog Number: ACM25087267
• Product Name: Poly(methacrylic acid)
• CAS: 25087-26-7
• Category: Polymer/Macromolecule
• Description: Methacrylic acid appears as a clear colorless liquid (or low-melting solid) with a pungent odor. Corrosive to metals and tissue. Flash point 170°F. Melting point 61°F. May polymerize exothermically if heated or contaminated. If the polymerization takes place inside a container, the container may rupture violently. Less dense than water. Vapors heavier than air. Used to make plastics.;Liquid;COLOURLESS LIQUID OR COLOURLESS CRYSTALS WITH CHARACTERISTIC ODOUR.;Colorless liquid or solid (below 61°F) with an acrid, repulsive odor.;Colorless liquid or solid (below 61°F) with an acrid, repulsive odor.
• IUPAC Name: 2-methylprop-2-enoic acid
• Molecular Weight: 86.09g/mol
• Molecular Formula: C4H6O2;CH2=C(CH3)COOH;C4H6O2;C4H6O2
• Canonical SMILES: CC(=C)C(=O)O
• InChI: InChI=1S/C4H6O2/c1-3(2)4(5)6/h1H2,2H3,(H,5,6)
• InChI Key: CERQOIWHTDAKMF-UHFFFAOYSA-N
• Boiling Point: 325 °F at 760 mm Hg (NTP, 1992);163.0 °C;163 °C at 760 mm Hg;159-163 °C;325°F;325°F
• Melting Point: 61 °F (NTP, 1992);16.0 °C;16 °C;16 °C;61°F;61°F
• Flash Point: 170 °F (NTP, 1992);76 °C (open cup);153 °F (67 °C) (closed cup);68 °C c.c., 77 °C o.c.;171°F (open-cup);(oc) 171°F
• Density: 1.015 at 68 °F (USCG, 1999);1.0153 at 20 °C/4 °C;Relative density (water = 1): 1.02;1.015 at 68°F;1.02 (Liquid)
• Solubility: greater than or equal to 100 mg/mL at 63° F (NTP, 1992);1.03 M;Soluble in chloroform; miscible with ethanol, ether;In water solubility, 89 g/L at 20 °C;Solubility in water: moderate;(77°F): 9%
• Autoignition Temperature: 752 °F (USCG, 1999);752 °F (400 °C)
• Color/Form: Clear colorless liquid or colorless crystals;Long prisms
• Complexity: 83.5
• Corrosivity: Forms corrosive liquid at melting point
• Covalently-Bonded Unit Count: 1
• Decomposition: When heated to decomposition it emits acrid smoke and irritating fumes.;Hazardous decomposition products include carbon monoxide and acrid fumes. /Methacrylic acid, inhibited/
• EC Number: 201-204-4
• Exact Mass: 86.036779g/mol
• Formal Charge: 0
• Hazard Statements: Irritant; , Unknown
• H-Bond Acceptor: 2
• H-Bond Donor: 1
• Heat of Vaporization: 0.418 kJ/mol at 101.3 kPa (760 mm Hg)
• Heavy Atom Count: 6
• ICSC Number: 0917
• LogP: 0.93 (LogP);log Kow = 0.93;0.93
• Monoisotopic Mass: 86.036779g/mol
• NSC Number: 7393
• Odor: Acrid, repulsive odor
• Other Experimental: Specific heat capacity: 2.1 J/g K; critical volume: 270 cu cm/mol;Its vapors are heavier than air. /Methacrylic acid, glacial/;Heat capacity: 2.1-2.3 J/kg; heat of polymerization: 56.5 KJ/mole;Boiling point: 81 °C at 30 mm Hg; 63 °C at 12 mm Hg; polymer forms ceramic-looking mass, sol in absolute alcohol, from which it is precipitated by ether; polymerizes easily, especially on heating or in the presence of traces of HCl;Saturated concn in air: 3.0 g/cu m at 20 °C; 6.3 g/cu m at 30 °C.;Henry's Law constant = 3.9X10-7 atm-cu m/mole at 25 °C;Hydroxyl radical rate constant: 1.9X10-11 cu cm/molecule sec at 25 °C (est);Ozone reaction rate: 4.1X10-18 cu cm/molecule-sec at 23 °C
• Refractive Index: Index of refraction: 1.43143 at 20 °C/D
• Rotatable Bond Count: 1
• RTECS Number: OZ2975000
• Stability: Acrylic acid and methacrylic acid readily polymerize in the presence of light, heat and oxygen, and also under the action of oxidizing agents such as peroxides.
• UNII: 1CS02G8656
• UN Number: 2531;2531;2531;2531;2531
• Vapor Density: 2.97 (NTP, 1992) (Relative to Air);2.97 (Air = 1);Relative vapor density (air = 1): 2.97;2.97
• Vapor Pressure: 0.65 mm Hg at 68 °F ; 1 mm Hg at 77° F (NTP, 1992);0.99 mmHg;0.99 mm Hg at 25 °C;Vapor pressure, Pa at 25 °C: 130;0.65 mmHg at 68°F;0.7 mmHg
• Viscosity: 1.38 mPa.s at 24 °C
• XLogP3: 0.9

Case Study

Preparation of Polymethacrylic Acid/Nanosilver Composite Materials

Solomon, M. M., et al. Journal of Molecular Liquids, 2015, 212, 340-351.

Polymethacrylic acid (PMAA) has multiple adsorption centers and can be used to prepare well-dispersed and highly stable nanoparticle composites, such as silver nanoparticles (AgNPs) composites. The PMAA/AgNPs composite material can effectively inhibit the corrosion of low carbon steel in 0.5 M H2SO4 solution.
Synthesis procedure of PMAA/AgNPs composites
· PMAA/AgNPs composites were prepared in situ by mixing aqueous polymethacrylic acid (PMAA) solution and AgNO3 solution.
· Firstly, different concentrations (50 ppm, 100 ppm, 500 ppm, 750 ppm, and 1000 ppm) of the PMAA were prepared in 0.5 M H2SO4 solution.
· Secondly, the respective concentration of the polymer solution was used to prepare 0.001 M AgNO3 solution.
· Thirdly, to every 100 cm3 of the respective mixture, 5 cm3 of natural honey which served as reducing and capping agent was added. The resulting mixture was left standing at room temperature for four days to obtain the product.