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    • Poly(methacrylic acid)

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    Catalog Number
    ACM25087267
    CAS Number
    25087-26-7
    Product Name
    Poly(methacrylic acid)
    Structure
    Category
    Polymers
    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%
    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
    EC Number
    201-204-4
    Exact Mass
    86.036779g/mol
    Formal Charge
    0
    Hazard Statements
    Irritant
    , Unknown
    Heat of Vaporization
    0.418 kJ/mol at 101.3 kPa (760 mm Hg)
    Heavy Atom Count
    6
    ICSC Number
    0917
    Log P
    0.93 (LogP);log Kow = 0.93;0.93
    MeSH Entry Terms
    2-methylacrylic acid;methacrylic acid;methacrylic acid, calcium salt;methacrylic acid, sodium salt;sodium methacrylate
    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
    MSDS
    Download MSDS
    COA
    Download COA
    Spec Sheet
    Download Spec Sheet
    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.

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