bbc bitesize polymers

Polymers are chains made of monomer subunits. mer (pŏl′ə-mər) n. Any of numerous natural and synthetic compounds of usually high molecular weight consisting of up to millions of repeated linked units, each a relatively light and simple molecule. Polymer, any of a class of natural or synthetic substances composed of very large molecules that are multiples of simpler chemical units. Amines; Amino acids; Aromatic organic compounds; Phenols The reagent used to initiate the polymerization reaction. These monomers (the starting materials) are often alkenes. The structure and chemical composition of the polymer chain determines the physical properties of the material. Producer PHILIP ASHBY A BBC/Open University production 1.45 Pages from Ceefax 2.0 Scene Football Fans Abroad Medical applications range from important day-to-day products such as latex gloves, bandages, and tubing, to applications as advanced as self-tying sutures, implantable medical devices, and artificial joints. 2014. Home; About Us. Polymers are very large molecules (sometimes called macromolecules). In some polymers shorter chains grow off the long chain at certain intervals, so that a branched structure is formed. This can be heated and bent using a line bender and, as it is a thermoforming polymer, it can then be reheated and reshaped. A shape memory polymer can change from a temporary shape that is achieved by deforming it, to a previous shape which is its permanent shape when it is not being deformed. O2. It can also be prepared by ring-opening polymerization of lactide [–C(CH 3)HC(=O)O–] 2, the cyclic dimer of the basic repeating unit. Addition polymers are formed by the joining together of many monomers that contain C=C bonds. BBC Bitesize – Designer polymers. Open Learn - Introduction to polymers. ... Recall that polymers are made from small molecules called monomers joined together in very long chains. Open Access Polymer Science Journal - use key words specific to the question and … Polymers - Polymers - AQA - GCSE Design and Technology ... A popular polymer to use in schools is acrylic. Aromatics, Amines, Amino Acids,Polymers. How the loss can be prevented. [Greek polumerēs, consisting of many parts : polu-, poly- + meros, part; see (s)mer- in Indo-European roots.] Higher and lower power points and lesson plans with resources for each. Polymers 9 Q56-58 2.3.2 BBC Bitesize The uses of polymers Giant Covalent Structures 10 Q45 Properties of covalent compounds Properties of metals and alloys Q45 BBC Bitesize The properties and uses of metals Metals as sonductors Q46-49 Diamond Q60-61 Structure of diamond and graphite Graphite 11 Q62 BBC Bitesize Properties and structure of graphite Written by teachers for the Edexcel IGCSE Chemistry course. Naturally occurring miscellaneous polymers, like, for instance, shellac, a resin secreted by the lac insect. Food Technology Vitamin loss during cooking (through heat and water). A BBC/Open University production 1.20 Polymer Engineering Manufacturing with Polymers Modern plastics have a surprising effect on product design, as the experience of an electronics manufacturer shows - and there's an intriguing insidestory. In other polymers the branches become numerous and cross-link to other polymer chains, thus forming a network structure. A monomer is a repeating chemical unit. Polymers are encountered in everyday life and are used for many purposes! KS3 Polymers for the new national curriculum. Detailed revision notes on the topic Experiment: Finding Formulae of Compounds. Polylactic acid, or polylactide (PLA) is a thermoplastic polyester with backbone formula (C 3 H 4 O 2) n or [–C(CH 3)HC(=O)O–] n, formally obtained by condensation of lactic acid C(CH 3)(OH)HCOOH with loss of water (hence its name). Body too is made up of many monomers that contain C=C bonds other )... 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