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Polymer print that page


A polymer is a large molecule ( macromolecule ) composed of repeating structural units . These subunits are typically connected by covalent chemical bonds . Although the term polymer is sometimes taken to refer to plastics , it actually encompasses a large class comprising both natural

Conductive polymer print that page


The linear-backbone polymer blacks" ( polyacetylene , polypyrrole , and polyaniline ) and their copolymers are the main class of conductive polymers. Historically, these are known as melanins . Poly(p-phenylene vinylene) (PPV) and its soluble derivatives have emerged as the prototypical

Polymer chemistry print that page

rubber , Bakelite , Kevlar , epoxy … Polymers are formed by polymerization of monomers . A polymer is chemically described by its degree of polymerisation , molar mass distribution , tacticity , copolymer distribution, the degree of branching , by its end-groups , crosslinks , crystallinity | 2011/5/21 19:28:08

Polymer separators print that page


A polymer separator is a permeable membrane placed between the anode and cathode of a battery. The main function of a separator is to keep the positive and negative electrodes, the cathode and anode respectively, apart to prevent electrical short circuits while also allowing the transport

Polymer clay print that page


practical and decorative applications, was extremely popular with designers and had an early form of polymer clay available in kits, but the phenol base of uncured Bakelite was flammable and these were discontinued. Modern polymer clays are based on a plastic modeling compound brought to

Coordination polymer print that page


A coordination polymer is an inorganic or organometallic polymer structure containing metal cation centers linked by ligands , extending in an array. It can also be described as a polymer whose repeat units are coordination complexes . Similar supramolecular architectures are also called

Polymer science print that page

This science comprises three main sub-disciplines: Polymer chemistry or macromolecular chemistry , concerned with the chemical synthesis and chemical properties of polymers. Polymer physics , concerned with the bulk properties of polymer materials and engineering applications. Polymer | 2011/4/18 23:48:25

Polymer characterization print that page

determine the molecular weight distribution as well as the degree of long chain branching of a polymer , provided a suitable solvent can be found. Copolymers with short chain branching such as linear low-density polyethylene (a copolymer of ethylene and a higher alkene such as hexene or octene | 2011/2/1 22:15:51

Superabsorbent polymer print that page

improve water conservation in soils. They developed a resin based on the grafting of acrylonitrile polymer onto the backbone of starch molecules (i.e. starch-grafting). The hydrolyzed product of the hydrolysis of this starch-acrylonitrile co polymer gave water absorption greater than 400 | 2011/7/7 23:23:18

Polymer physics print that page

While it focuses on an aspect of the study of condensed matter physics , polymer physics is originally a branch of statistical physics . In turn, polymer physics and polymer chemistry are part of the wider field of polymer science . Disordered polymers are too complex to be described | 2011/5/26 10:30:30