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pp plastic series

pp plastic series

pp plastic is a thermoplastic resin produced by the polymerisation of propylene. According to the methyl arrangement position is divided into isotactic polypropylene (isotactic polypropylene), atactic polypropylene (atactic polypropylene) and intermediate polypropylene (syndiotactic polypropylene) three. Methyl arranged in the main chain of the molecule on the same side of the isotactic polypropylene, if the methyl disorderly arranged in the main chain of the molecule on both sides of the atactic polypropylene, when the methyl alternately arranged in the main chain of the molecule on both sides of the isotactic polypropylene. General industrial production of polypropylene resin, isometric structure content of about 95%, the rest of the atactic or intermediate polypropylene. Industrial products are mainly composed of isoforms. Polypropylene also includes copolymers of propylene and small amounts of ethylene. It is usually a translucent colourless solid, odourless and non-toxic. Due to the regular structure and high degree of crystallisation, so the melting point can be as high as 167 ℃. Heat and corrosion resistance, products can be sterilised by steam is its outstanding advantage. Small density, is the lightest general-purpose plastics. Disadvantages are poor low-temperature impact resistance, easier to age, but can be overcome by modification.

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