Thermoplastic synthetic materials and their application for construction of pools
The name speaks ” a synthetic material ” that will be a question of the materials, made is artificial. As initial raw material oil, natural gas and coal is applied. By transformation of these substances chemical compounds which the structure and define specific properties of materials turn out. The SM share on 3 groups: termoplasty, duroplasty and elastomery. In given clause it will be a question about termoplastakh and one of areas of their application.
Synthetic materials which repeatedly after heating become soft down to a liquid condition, and after cooling again get durability, refer to termoplastami. They contain the linear or branched out molecular circuits which, as a rule, are located randomly or have the certain structure. The size of physical strengths between these molecules completely defines properties and behaviour termoplastov. In connection with that these properties depend on temperature, properties termoplastov in a solving measure depend on temperature of application.
Termoplasty share on 2 groups:
- Amorphous termoplasty - their molecules are not ordered and have no internal structure (structure komka cotton wool), at 20°С are strong, firm and fragile
- Partially kristallizovannye termoplasty - in them alongside with amorphous sites sites in which molecules are located uporyadochenno, they contain at a room temperature firm and strong
Polypropylene is formed as a result of polymerization of propylene. Lateral methyl group SN3-can be spatially differently sorientirovana (casual image or uporyadochenno), that allows to receive propylene with different properties. If all groups SN3-are on one party of a molecular circuit, polypropylene refers to izotakticheskim.
nCH2=CH2 (CH3)-> [-CH2-CH2 (CH3)-] n
Partially kristallizovannyj izotaktichesky polypropylene represents for us in this case the greatest interest as only at it high ability to crystallization influences relevant technical properties