Any substance added to a polymer system to increase the plasticity of the polymer system may be called a plasticizer.
Plasticizer is the main function of polymer molecules between the price of health, the van der Waals force, thus increasing the mobility of the polymer molecular chain, reduce the crystalline polymer molecular chain, which increased the plasticity of polymer, show the polymer hardness, modulus, softening temperature and the embrittlement temperature drop, and the elongation, flexible and flexibility.
Plasticizer can be divided into two major types according to its mode of action, namely plasticizer inside and plasticizer outside.
The internal plasticizer is actually part of the polymer. The general internal plasticizer is the second monomer introduced in the polymerization process of the polymer. Because the second monomer is copolymerized in the molecular structure of the polymer, the regularity of the polymer molecular chain is reduced, that is, the crystallinity of the polymer molecular chain is reduced. For example, vinyl chloride - ester - acid copolymers are softer than vinyl chloride homopolymers. The inner plasticizer is used in a narrow temperature range and must be added during the polymerization process, so the inner plasticizer is used less.
An external plasticizer is a low molecular weight compound or polymer that is added to a polymer that needs to be plasticized to increase the plasticity of the polymer. External plasticizer is a kind of high boiling point of the less volatile liquid or low solubility of the solid, and the vast majority of ester organic compounds. Usually they do not react chemically with the polymer, and their interaction with the polymer is mainly swelling at higher temperatures, forming a solid solution with the polymer. External plasticizer performance is more comprehensive and production and use of convenient, widely used. Now the plasticizer that people says commonly is to point to outside plasticizer. Dioctyl phthalate (DOP) and dibutyl phthalate (DBP) are external plasticizers.
2. Classification and performance of plasticizer
There are many kinds of plasticizers. In its research and development stage, there were more than 1000 kinds of plasticizers. As a commercial production, there were no more than 200 kinds of plasticizers.
Plasticizers are classified in many ways. According to the molecular weight can be divided into haplotype plasticizer and polymerization plasticizer; According to the shape can be divided into liquid plasticizer and solid plasticizer; According to the performance can be divided into general plasticizer, cold plasticizer, heat resistant plasticizer, flame retardant plasticizer; Classification according to chemical structure of plasticizer is a common classification method.
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