Polypropylene multiple monomer

Polyethylene (Section 6 21) A polymer of ethylene Polymer (Section 6 21) Large molecule formed by the repeti tive combination of many smaller molecules (monomers) Polymerase chain reaction (Section 28 16) A laboratory method for making multiple copies of DNA Polymerization (Section 6 21) Process by which a polymer is prepared The principal processes include free radical cationic coordination and condensation polymerization Polypeptide (Section 27 1) A polymer made up of many (more than eight to ten) amino acid residues Polypropylene (Section 6 21) A polymer of propene Polysaccharide (Sections 25 1 and 25 15) A carbohydrate that yields many monosacchande units on hydrolysis Potential energy (Section 2 18) The energy a system has ex elusive of Its kinetic energy... 

A typical Py-FI mass spectrum for a hydrocarbon polymer (isotactic polypropylene) is shown in Figure 6.9 TTie spectrum shows the initial pyrolyzates that are formed as the polymer is held at 400°C in the direct probe. Volatile pyrolyzates are observed at every carbon number up to -1400 Da (Cioo). It is interesting that the principal oligomer series at low mass is simply multiples of the propylene monomer xmit (MW = 42n, series A). The principal series at higher mass values, however, is an a, -diene series (MW = 42n -l-12, series E). The pyrolysis mechanism may be explained by a free radical degradation pathway. ... 

An addition poiymer is a polymer formed by linking together many molecules by addition reactions. The monomers must have multiple bonds that will undergo addition reactions. For example, when propylene (lUPAC name, propene) is heated under pressure with a catalyst, it forms polypropylene. 

Plastic is a material that can be plasticized into certain shapes under certain conditions (temperature, pressure, etc.) and can keep its shape unchanged at room temperature and normal atmosphere pressure. According to their performance after heat treatment, plastics can be divided into thermoplastic and thermosetting plastics. A thermoplastic plastic is generally a linear or branched polymer. It melts when heated and solidifies when cooled, and this kind of behavior can be repeated, so the plastic can be used multiple times. The main varieties are polyethylene, polypropylene, polyvinyl chloride, polystyrene, and acrylonitrile-butadiene-styrene terpolymer. Thermosetting plastic is a space network polymer, which is formed by direct polymerization of monomers or by cross-linking of linear prepolymers. Once the solidification is finished, the polymer cannot be heated back to the plasticizing state. The main varieties are phenolic resin, epoxy resin, amino resin, and unsaturated polyester. 

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