Rapid curing prospects of geopolymer cementitious composite using frontal polymerization of methyl methacrylate monomer

2021 ◽  
Vol 309 ◽  
pp. 125198
Author(s):  
Shaurav Alam ◽  
Tanvir Manzur ◽  
Ashlesh Banjara ◽  
Sven Eklund ◽  
Adarsh Radadia ◽  
...  
Keyword(s):  
Methyl Methacrylate ◽  
Frontal Polymerization ◽  
Cementitious Composite ◽  
Methacrylate Monomer ◽  
Methyl Methacrylate Monomer

scholarly journals Effect of Ferocene Concentration on the Percent Conversion and Molecular Weight of Poly(Methyl Methacrylate) Homopolymers

2017 ◽  
Vol 14 (2) ◽  
pp. 311-319
Author(s):  
Baghdad Science Journal
Keyword(s):  
Molecular Weight ◽  
Free Radical ◽  
Methyl Methacrylate ◽  
Benzoyl Peroxide ◽  
Radical Polymerization ◽  
Free Oxygen ◽  
Poly Methyl Methacrylate ◽  
Methacrylate Monomer ◽  
Percent Conversion ◽  
Methyl Methacrylate Monomer

This research is addressing the effect of different ferrocene concentration (0.00, 2.15x10-3, 4.30x10-3, 8.60x10-3, and 12.9x10-3) on the bulk free radical polymerization of methyl methacrylate monomer in benzene using benzoyl peroxide as initiator. The polymerization was conducted at 60º C under free oxygen atmosphere. The resulting polymers were characterized by FTIR. The results were compared with the presence and absence of ferrocene at 10% conversion. The %conversion was 3.04% with no ferrocene present in the polymerization medium and its increase to 9.06 with a first lowest ferrocene concentration added, i.e. 2.15 x10-3mol/l. This was positively reflected on the poly(methyl methacrylate) molecular weight measured by viscosity technique, especially in the presence of ferrocene.

Synthesis and grafting of carboxymethyl cellulose from environmental pollutant cellulosic wastes of textile industry

2016 ◽  
Vol 20 (3) ◽  
pp. 126-135 ◽  
Author(s):  
Md. Ibrahim H. Mondal ◽  
Firoz Ahmed
Keyword(s):  
Methyl Methacrylate ◽  
Carboxymethyl Cellulose ◽  
Reaction Medium ◽  
Value Added ◽  
Single Step ◽  
Cellulose Derivatives ◽  
Content Type ◽  
Cellulosic Waste ◽  
Methacrylate Monomer ◽  
Methyl Methacrylate Monomer

Purpose This study aims to explore the use of knitted rag by synthesizing different grades of carboxymethyl cellulose (CMC) by applying multiple-step carboxymethylation techniques. Design/methodology/approach CMC was synthesized from knitted rag, a cellulosic waste of textile and garment industries, in aqueous ethanolic sodium hydroxide and subsequently mono-chloroacetic acid reaction medium. Low-substituted to high-substituted products were obtained from single-step to seven-step carboxymethylation of cellulose. In this way, it was possible to produce low-cost and different grades of substituted carboxymethylated cellulose. The synthesized CMC was characterized, and their physical properties were investigated. The structure of CMC and grafted CMC were investigated by Fourier transform infrared spectroscopy. Findings Solubility, CMC content, degree of substitution and molecular weight of CMC were increased gradually with the increase in the number of reaction steps, although fourth step attained the optimum. The cellulosic waste of knitted rag can easily be used to produce value-added products such as CMC and other cellulose derivatives, and that will ultimately reduce the pollution problems from this waste. Originality/value Grafting of prepared CMC film with methyl methacrylate monomer increased their strength, although decreased rigidity and moisture content because the incorporation of hydrophobic methyl methacrylate monomer was observed.

The Release of Residual Monomeric Methyl Methacrylate from Acrylic Appliances in the Human Mouth: An Assay for Monomer in Saliva

1988 ◽  
Vol 67 (10) ◽  
pp. 1295-1299 ◽  
Author(s):  
S. Baker ◽  
S.C. Brooks ◽  
D.M. Walker
Keyword(s):  
Liquid Chromatography ◽  
Methyl Methacrylate ◽  
Limit Of Detection ◽  
Base Plate ◽  
Maximum Amount ◽  
Gas Liquid Chromatography ◽  
Healthy Human ◽  
Whole Saliva ◽  
Methacrylate Monomer ◽  
Methyl Methacrylate Monomer

A gas-liquid chromatography assay has been developed for the estimation of methyl methacrylate monomer (MMA) in whole saliva, with a lower limit of detection in the order of 1μg/mL. Healthy human dentate subjects wore recently made autopolymerized or heat-polymerized polymethyl methacrylate (PMMA) palatal appliances. MMA released into saliva was detected for up to one week after insertion of autopolymerized appliances, with a maximum concentration of 45 μg/mL in whole saliva or 180 μg/mL in the salivary film on the fitting surface. The MMA was not detected in blood or urine. MMA was also present in the saliva of volunteers wearing appliances which had been heat-polymerized at 70°C for one hr but not cured at 70°C for three hr. The maximum amount of monomer released by an autopolymerized base plate was 29.5 μg in the first hour, which, while not a toxic or primary irritant dose, could possibly sensitize patients or elicit an allergic reaction. For minimization of monomer release, autopolymerized appliances should be immersed for 24 hr in water before being worn.

Some Simple Quantitative Applications of Vascular Corrosion Casting

1998 ◽  
Vol 4 (S2) ◽  
pp. 914-915
Author(s):  
Dr. Fred E. Hossler
Keyword(s):  
Methyl Methacrylate ◽  
Ringer Solution ◽  
Corrosion Casting ◽  
Corrosion Casts ◽  
3 Dimensional ◽  
Quantitative Measurements ◽  
Methacrylate Monomer ◽  
Corrosion Cast ◽  
Methyl Methacrylate Monomer

The primary use of vascular corrosion casting has been and likely will continue to be for describing the 3-dimensional anatomy of the microvasculature of organs and tissues. In these studies the assumption is made that the corrosion cast faithfully replicates the anatomy, dimensions, and distribution of the vasculature of these tissues and organs. If this assumption is accurate, and it appears to be nearly so in tissues where measurements have been made, it follows that the casts should lend themselves to quantitative measurements. I summarize here some simple quantitative measurements we have made from corrosion casts. For these studies, cannulas were inserted into arteries leading to the organ of interest in anesthetized animals, and the blood was removed by flushing with Ringer solution or buffered saline, at physiological temperatures and pressures. Resin consisting of Mercox (or Mercox diluted with methyl methacrylate monomer) and catalyst was infused via the same cannula until the onset of polymerization.

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