Chain-like polymers

An, H., Lan, Y., Li, Y. et al. (2004) A novel chain-like polymer constructed from heteropolyanions covalently hnked by lanthanide cations (C5H9N02)2[La(H20>7CrMo6H6024] llH20 (Proline =C5H9N02). Inorganic Chemistry Communications, 1, 356-358. 

Genetic information is stored in DNA, a chemical chain-like polymer in which each link is a chemical letter (nucleotide) drawn from the nucleic acid alphabet of four... 

Crosslinking - Reaction or formation of covalent bonds between chain-like polymer molecules or between polymer molecules and low-molecular compounds such as carbon black fillers. As a result of crosslinking, polymers such as thermosetting resins may become hard and infusible. Crosslinking is induced by heat, UV or electron-beam radiation, oxidation, etc. Crosslinking can be achieved either between polymer molecules alone as in unsaturated polyesters or with the help of multifunctional crosslinking agents such... 

Figure 6 1-D chain-like polymers formed with mononuclear AsEs building units in Na[AsSe2] (23) and K[AsSe3]-H20 (24) or with cyclic molecular building units in (Me4N)2As4S7 (25) ...

Many neutral gold(l) complexes form chain-like polymers with short Au(l)- -Au(I) contacts unsupported by any ligand. This is the case for [AuX(L)] (24, Scheme 10) [X = halide or cyanide, L = isocyanide,tetrahydrothio-phene, 1,4,7-trithiacyclononane, P(o-tolyl)H2, PPh(Me)H, ... 

The quadrupole splitting in the Mossbauer spectrum of the thiosemicarbazide complex [Fe(NH2NHCSNH2)2]S04 is particularly large (4.65 mm s ) and an X-ray crystal structure showed an unusual chain-like polymer formed by bridges between cis- and trans-... 

Fe(NH2NHCSNH2)2]S04 is particularly large (4.65 mm s showed an unusual chain-like polymer formed by SOJ"... 

All macromolecules are chain-like polymers built up from smaller monomers. Usually only one family of subunits is used to construct each chain [3]. Amino acids are hnked to other amino acids to form proteins, sugars are linked to form polysaccharides and nucleic acids are sequences of nucleotides. 

The bulk of the reported early research on electrospinning focused on a limited number of polymer/solvent combinations. Naturally, these were the polymers that were easy to electrospin under laboratory conditions. These likely included those polymers that dissolved in common solvents that are good solvents for the polymer, where the chain-like polymer molecules adopt open, extended macromolecular conformations (as opposed to compact globular geometries) that allow adequate entanglement of polymer chains. With potential for future scale-up in mind, solvents that are both economical and also environmentally acceptable were preferred. 

Simply put, polymers are giant molecules. Unlike small molecules such as Hp, benzoic acid, and glucose that we are more familiar with, polymers are large molecules with a chain-like structure. This long chain-like polymer structure is formed by bonding between small molecular units called monomers. The chemical process by which monomers bond with each other and form long chain-like structures is a reaction called polymerization (Figure 2.1). 

Linear chain-like polymer units have a molecular weight of 310,000. Stable in the range of pH 3—11. 

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