Superplasticizer - Polycarboxylate Ether Superplasticizer - Chemical Structure

Chemical Structure

PCEs are composed by a methoxy-polyethylene glycol copolymer (side chain) grafted with methacrylic acid copolymer (main chain). The carboxylic acid COONa dissociates in water, providing a negative charge along the PCE backbone. The polyethylene oxide (PEO or MPEG) group affords a not uniform distribution of electron cloud, which gives a chemical polarity to the side chains. The number and the length of side chains are flexible parameters that are easy to change. When the side chains have a huge amount of EO units, they lower with their high molar mass the charge density of the polymer, which enables poor performances on cement suspensions. To have both parameters on the same time, long side chain and high charge density, one can keep the number of main-chain-units much higher than the number of side-chain-units.

Read more about this topic:  Superplasticizer, Polycarboxylate Ether Superplasticizer

Other articles related to "chemical structure, structure":

Chemical Structure - Structure Determination
... in chemistry is the process of determining the chemical structure of molecules ... The methods by which one can determine the structure of a molecule include spectroscopy, such as nuclear magnetic resonance (NMR), infrared spectroscopy and Raman spectroscopy, electron ... The following are common methods for determining the chemical structure (Structural elucidation) X-ray diffraction Proton NMR Carbon-13 NMR Mass spectrometry Infrared spectroscopy The ...
Microsoft Office 2008 For Mac - Limitations
... A data-compatibility problem has also been noted with CambridgeSoft's chemical structure drawing program, ChemDraw ... Word 2008 does not retain the structural information when a chemical structure is copied from ChemDraw and pasted into a document ... If a structure is recopied from a Word 2008 document, and is pasted back into ChemDraw, it appears as a non-editable image rather than a recognized chemical structure ...

Famous quotes containing the words structure and/or chemical:

    Vashtar: So it’s finished. A structure to house one man and the greatest treasure of all time.
    Senta: And a structure that will last for all time.
    Vashtar: Only history will tell that.
    Senta: Sire, will he not be remembered?
    Vashtar: Yes, he’ll be remembered. The pyramid’ll keep his memory alive. In that he built better than he knew.
    William Faulkner (1897–1962)

    We are close to dead. There are faces and bodies like gorged maggots on the dance floor, on the highway, in the city, in the stadium; they are a host of chemical machines who swallow the product of chemical factories, aspirin, preservatives, stimulant, relaxant, and breathe out their chemical wastes into a polluted air. The sense of a long last night over civilization is back again.
    Norman Mailer (b. 1923)