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polymer cement

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1) "Polymer" -- As to polymer cement poly·mer Pronunciation: 'pä-l&-m&r Function: noun Etymology: International Scientific Vocabulary, back-formation from polymeric, from Greek polymerEs having many parts, from poly- + meros part -- more at MERIT : a chemical compound or mixture of compounds formed by polymerization and consisting essentially of repeating structural units - poly·mer·ic /"pä-l&-'mer-ik/ adjective - poly·mer·ism /p&-'li-m&-"ri-z&m, 'pä-l&-m&-/ noun Pronunciation Symbols A polymer is a substance composed of molecules with large molecular mass consisting of repeating structural units, or monomers, connected by covalent chemical bonds. The term is derived from the Greek words: polys meaning many, and meros meaning parts [2]. The individual molecules which comprise a polymer are referred to as polymer molecules, where the word "polymer" functions as an adjective.[1] In popular usage, the term polymer is often used as a synonym for plastic. 1 Overview 2 Polymer science 3 Classification of polymer molecules 4 Polymer nomenclature 5 Physical properties of polymers 6 Chemical properties of polymers 7 Polymers in solution 8 Polymer characterization 9 Manipulating Polymers 9.1 Branching 9.2 Cross-linking 9.3 Inclusion of plasticizer 9.4 Chain Length 10 Polymer degradation 11 Industry 12 References 13 See also 14 External links 14.1 Scientific journals While the term polymer in popular usage suggests "plastic", polymers comprise a large class of natural and synthetic materials with a variety of properties and purposes. Natural polymer materials such as shellac and amber have been in use for centuries. Paper is manufactured from cellulose, a naturally occuring polysaccharide found in plants. Biopolymers such as..." 2) "Cement" -- As to polymer cement 1ce·ment Pronunciation: si-'ment also 'sE-ment Function: noun Etymology: Middle English sement, from Anglo-French ciment, from Latin caementum stone chips used in making mortar, from caedere to cut 1 a : CONCRETE b : a powder of alumina, silica, lime, iron oxide, and magnesium oxide burned together in a kiln and finely pulverized and used as an ingredient of mortar and concrete; also : any mixture used for a similar purpose 2 : a binding element or agency: as a : a substance to make objects adhere to each other b : something serving to unite firmly <justice is the cement that holds a political community together -- R. M. Hutchins> 3 : CEMENTUM 4 : a plastic composition made especially of zinc or silica for filling dental cavities 5 : the fine-grained groundmass or glass of a porphyry Pronunciation Symbols In the most general sense of the word, cement is a binder, a substance which sets and hardens independently, and can bind other materials together. The name "cement" goes back to the Romans who used the term "opus caementitium" to describe masonry which resembled concrete and was made from crushed rock with burnt lime as binder. The volcanic ash and pulverized brick additives which were added to the burnt lime to obtain a hydraulic binder were later referred to as cementum, cimentum, cäment and cement. Cements used in construction are characterized as hydraulic or non-hydraulic. The most important use of cement is the production of mortar and concrete - the bonding of natural or artificial aggregates to form a strong building material which is durable in the face of normal environmental effects. 1 Hydraulic cements 2 History 2.1 Early Uses 2.2 Modern cement 3 Types of modern cement 3.1 Portland cement 3.2 Portland cement blends 3.3 Non-Portland Hydraulic Cements 4 Environment 4.1 Fuels 5 Notes 6 Literature 7 See also 8 External links Hydraulic cements are materials which set and harden after combining with water, as a result of chemical reactions with the mixing water and, after hardening, retain strength and stability even under water. The key requirement for this is that the hydrates formed on immediate reaction with water are essentially insoluble in water. Most construction cements today are hydraulic, and most of ..." 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