Thermodynamic properties of polymethyl methacrylate and methyl methacrylate

1963 ◽  
Vol 1 (5) ◽  
pp. 1701-1708 ◽  
Author(s):  
R. W. Warfield ◽  
M. C. Petree
Keyword(s):  
Thermodynamic Properties ◽  
Methyl Methacrylate ◽  
Polymethyl Methacrylate

Poly(methyl methacrylate)-modified cellulose fibers patterned with highly selective chromogenic reagent for rapid and trace determination of Co2+ in water

2018 ◽  
Vol 10 (36) ◽  
pp. 4454-4462 ◽  
Author(s):  
Liyakat Hamid Mujawar ◽  
Mohammad Soror El-Shahawi
Keyword(s):  
Methyl Methacrylate ◽  
Polymethyl Methacrylate ◽  
Filter Paper ◽  
Cellulose Fibers ◽  
Trace Determination ◽  
Poly Methyl Methacrylate ◽  
Chromogenic Reagent ◽  
One Step ◽  
Modified Cellulose

A simple one-step assay for the trace determination of Co2+ was developed on filter paper modified with solubilized polymethyl methacrylate (PMMA) and arrays of 3-[(2-mercapto-vinyl)-hydrazono]-1,3-dihydro-indol-2-one (MHDI) reagent.

Effects of Emulsifier Concentration on Nucleation Mode of Emulsion Polymerization of Methyl Methacrylate

2013 ◽  
Vol 395-396 ◽  
pp. 359-362
Author(s):  
Xiao Qin Xiao ◽  
Hong Wang ◽  
Li Bao Mei ◽  
Yan Lin Sun
Keyword(s):  
Particle Size ◽  
Methyl Methacrylate ◽  
Emulsion Polymerization ◽  
Polymethyl Methacrylate ◽  
Homogeneous Nucleation ◽  
Particle Number ◽  
Coverage Rate ◽  
Nucleation Mode ◽  
Emulsifier Concentration

The preparation of polymethyl methacrylate (PMMA) emulsions by semicontinuous dropping method is studied in this paper. The nucleation mode of emulsion polymerization of methyl methacrylate (MMA) under different emulsifier (SDS) concentrations is investigated. Some factors such as conversion, particle number (Np), particle size (PS), polydispersion index (PDI) and coverage rate were examined. The results show that when [SD is close to the CMC (eg. 6mmol/L to 10mmol/L), micelle nucleation will dominates and homogeneous nucleation can coexist, and Np fluctuates. But when [SD is less than 4mmol/L, the homogeneous nucleation dominates and micelle nucleation may also coexist, but Np is constant. It can be concluded that whether the [SD is above or below the CMC, the homogeneous nucleation and micelle nucleation can coexist in the system, but different factors affect the particle number.

ACRYLIC ACID/METHYL METHACRYLATE HYDROGELS. I. EFFECT OF COMPOSITION ON MECHANICAL AND THERMODYNAMIC PROPERTIES

2000 ◽  
Vol 37 (4) ◽  
pp. 307-321 ◽  
Author(s):  
Issa Katime ◽  
Elena Díaz de Apodaca ◽  
Eduardo Mendizábal ◽  
Jorge E. Puig
Keyword(s):  
Acrylic Acid ◽  
Thermodynamic Properties ◽  
Methyl Methacrylate ◽  
Acid Methyl

scholarly journals Consistent modelling of material weight loss and gas release due to pyrolysis and conducting benchmark tests of the model—A case for glovebox panel materials such as polymethyl methacrylate

PLoS ONE ◽  
2021 ◽  
Vol 16 (1) ◽  
pp. e0245303
Author(s):  
Takuya Ohno ◽  
Shinsuke Tashiro ◽  
Yuki Amano ◽  
Naoki Yoshida ◽  
Ryoichiro Yoshida ◽  
...  
Keyword(s):  
Weight Loss ◽  
Methyl Methacrylate ◽  
Polymethyl Methacrylate ◽  
Arrhenius Equation ◽  
Pressure Change ◽  
Radioactive Material ◽  
Bisphenol A Polycarbonate ◽  
Pyrolysis Gas ◽  
Gas Molecules ◽  
Fire Spreading

It is necessary to consider how a glove box’s confinement function will be lost when evaluating the amount of radioactive material leaking from a nuclear facility during a fire. In this study, we build a model that consistently explains the weight loss of glove box materials because of heat input from a flame and accompanying generation of the pyrolysis gas. The weight loss suggests thinning of the glove box housing, and the generation of pyrolysis gas suggests the possibility of fire spreading. The target was polymethyl methacrylate (PMMA), used as the glove box panel. Thermal gravimetric tests on PMMA determined the parameters to be substituted in the Arrhenius equation for predicting the weight loss in pyrolysis. The pyrolysis process of PMMA was divided into 3 stages with activation energies of 62 kJ/mol, 250 kJ/mol, and 265 kJ/mol. Furthermore, quantifying the gas composition revealed that the composition of the pyrolysis gas released from PMMA can be approximated as 100% methyl methacrylate. This result suggests that the released amount of methyl methacrylate can be estimated by the Arrhenius equation. To investigate the validity of such estimation, a sealed vessel test was performed. In this test, we observed increase of the number of gas molecules during the pyrolysis as internal pressure change of the vessel. The number of gas molecules was similar to that estimated from the Arrhenius equation, and indicated the validity of our method. Moreover, we also performed the same tests on bisphenol-A-polycarbonate (PC) for comparison. In case of PC, the number of gas molecules obtained in the vessel test was higher than the estimated value.

Flexural Properties of Silorane Bone Cement

2011 ◽  
Author(s):  
Jennifer R. Melander ◽  
Rachel A. Weiler ◽  
Bradley D. Miller ◽  
Kathleen V. Kilway ◽  
J. David Eick
Keyword(s):  
Flexural Strength ◽  
Methyl Methacrylate ◽  
Bone Cement ◽  
Polymethyl Methacrylate ◽  
Zirconium Oxide ◽  
Barium Sulfate ◽  
Flexural Modulus ◽  
Flexural Properties ◽  
Bone Cements ◽  
Powder Component

There has been little change in the formulation of bone cements since Sir John Charnley first developed them in the 1970s. Bone cements are methacrylate based systems packaged in two components [1]. The powder component contains a mixture of polymethyl methacrylate (PMMA), methyl methacrylate-styrene-copolymer, and a radio opacifier (either barium sulfate or zirconium oxide) [2]. The second component is a liquid monomer typically containing methyl methacrylate, N, N-dimethyl-p-toluidine (activator), and hydroquinone. Flexural strength and flexural modulus of bone cements range between 60–75 MPa and 2.2–3.3 GPa, respectively [3, 4]. ISO 5833 requires bone cements to have a strength greater than 50 MPa and a modulus greater than 1.8 GPa [5].

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