Processing aids Some simple instructions

Many of the same means, a simple structure repeating units connected by covalent bonds formed by the high molecular weight (usually up to 104 ~ 106) compound. Such as polyvinyl chloride molecule is composed of many molecules of vinyl chloride repeating structural unit-ch2chcl-concatenated, so-ch2chcl-also known as structural units or segments. Structural units can be formed by a small molecule composed of compounds known as monomers, synthetic polymer materials. Polyvinyl chloride can be abbreviated to:
n represents the number of repeating units, also PVC window stabilizer  known as polymerization degree of polymerization of the polymer is a measure of an important indicator. A low degree of polymerization (1 to 100) of the polymer is called oligomers, only when the molecular weight of up to 104 to 106 (such as plastic, rubber, fiber, etc.) to be referred to as polymers. Made of a polymer by polymerization of monomers called homopolymers as described above, polyvinyl chloride, polyethylene and the like. Copolymerizing two or more monomers from the polymer is called copolymers, such as vinyl chloride - vinyl acetate copolymer. So that natural rubber into practical engineering materials research has made key progress. baekeland reported the synthesis of a thermosetting phenolic resin, this conclusion is the establishment of modern polymer science foundation. Since the establishment of the concept of macromolecules decades, synthetic polymers and achieved rapid development, many important polymers have achieved industrialization. Classification of polymers from different angles can be classified on the polymer, such as oxidized PE WAX  from a single source, synthesis method, the end use, the heating behavior of the polymer structure. (1) according to the molecular structure of the main chain of the elements can be divided into the carbon chain of the polymer, mixed chain and organic elements into three categories.
The polymer main chain carbon chain molecules composed entirely of carbon atoms. Most vinyl and diene polymers fall into this category, such as polyethylene, polystyrene, polyvinyl chloride, etc. Hetero-chain polymer molecules, in addition to carbon atoms in the main chain, there are titanium dioxide  oxygen, nitrogen and sulfur heteroatoms. Such as polyether, polyester, polyamide, polyurethane, polysulfide rubber. Plastics, synthetic fibers, heat-resistant polymer is mostly mixed chain polymer. Macromolecular organic elements no carbon atoms in the main chain, mainly composed of silicon, boron, aluminum and oxygen, nitrogen, sulfur, phosphorus atoms, but the side groups was formed by the organic group such as methyl, ethyl, vinyl group. Organic silicone rubber is a typical example.
Organic elements, also known as semi-organic hybrid polymer chain, the main chain and the side groups if no carbon atoms, it becomes the inorganic polymer.
(2) the nature and purpose by material classification, can be divided into high polymer plastics, rubber and fibers.