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The molecular structure of the polymer
by：CSSSLD
2021-02-03
Polymer in different conditions of polymer molecular thermal motion characteristics is called physical state.
Closely related to physical state and temperature of the polymer.
When the temperature changes, the effect of the polymer stress and change, present a different physical state.
Form the amorphous polymer three obvious physical state, glassy state, high elastic state, and viscous flow state.
Glass transition temperature is polymer from the glass state into high elastic state of critical temperature, is also the highest use temperature of the plastic injection tooling.
polymer atomic number many, relative molecular mass of tens of thousands to tens of millions of long molecules, molecular chain. Resin has a natural resin and synthetic resin. Natural resin, both in terms of quantity and quality cannot meet the actual demand, which is used in the actual production of resin synthetic resin. Synthetic resin is people according to the molecular structure and characteristics of natural resin, made of artificial method to synthesis. Some synthetic resin can be directly used as plastics, such as polyethylene, polystyrene, nylon, etc. , but some of the synthetic resin have to add some additives can be used as a plastic, such as phenolic resin, amino resin, polyvinyl chloride (PVC), etc.
because of polymer molecules especially large and intermolecular force is bigger also, so easy to gather for liquid or solid, without formation of gas. The structure of the solid polymer to line up with the molecular geometry special could be divided into two kinds of crystalline and amorphous. Crystalline structure exists only in thermoplastics. Size of polymer due to a large number of crosslinking, molecular chain chain is difficult to make ordered arrangement, so have the amorphous structure.
polymer molecule is composed of innumerable monomer units, these units are called links, the links are connected constitute a long chain molecules. If the current situation of the polymer molecular weight become irregular, polymer is composed of their molecular chain, is called linear polymers. If some macromolecular polymer chain with some long or short branched chain, the whole chain is dendritic, is called linear polymers with branched chain.
if there is some short chain polymer of macromolecular chain between them each other crosslinking, a three-dimensional network structure, the polymer called system. The molecular structure of polymer is different, its performance is also different, many performance of the plastic is closely related to the molecular structure of the polymer. No chemical bonds between polymer molecular chain if produced, the heat will soften and flow, hardens as it cools, and this process is reversible and can be repeatedly forming, traditionally called the polymer thermoplastics.
injection quality of machining parts with small, high specific strength, corrosion resistance, good chemical stability, has good electrical insulating properties, optical properties, antifriction and wear resistance and noise elimination damping performance, but also has good plasticity, easy molding and low cost advantages, has been widely used in industry and daily life, become the indispensable materials. Plastic is resin as the main component of macromolecule organic compound, also known as polymers, polymer for short.
thermoplastics due to the resin molecular chains are linear or branched structures, so has the elasticity and plasticity, before and after molding can swelling or dissolved in appropriate solvent. Some polymer in heating for the first time can soften and flow, heated to a certain temperature, will produce crosslinking curing reaction and harden, this change is irreversible, since then, the heating again already can't become soft, flowing, the polymer plastic called thermosetting plastic. Thermosetting plastic resin in the curing of former is linear or branched chain, after curing to form chemical bonds between molecular chain, become a three-dimensional reticular structure, not only can't melt, and also can't dissolve in the solvent.
more excellent articles: hollow blow molding mold structure, click directly.
http://www。 csssld。 cn//html/2017/Info_0713/631。 HTML
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more wonderful articles, immediately search: changshu da plastic products factory smoothly
polymer atomic number many, relative molecular mass of tens of thousands to tens of millions of long molecules, molecular chain. Resin has a natural resin and synthetic resin. Natural resin, both in terms of quantity and quality cannot meet the actual demand, which is used in the actual production of resin synthetic resin. Synthetic resin is people according to the molecular structure and characteristics of natural resin, made of artificial method to synthesis. Some synthetic resin can be directly used as plastics, such as polyethylene, polystyrene, nylon, etc. , but some of the synthetic resin have to add some additives can be used as a plastic, such as phenolic resin, amino resin, polyvinyl chloride (PVC), etc.
because of polymer molecules especially large and intermolecular force is bigger also, so easy to gather for liquid or solid, without formation of gas. The structure of the solid polymer to line up with the molecular geometry special could be divided into two kinds of crystalline and amorphous. Crystalline structure exists only in thermoplastics. Size of polymer due to a large number of crosslinking, molecular chain chain is difficult to make ordered arrangement, so have the amorphous structure.
polymer molecule is composed of innumerable monomer units, these units are called links, the links are connected constitute a long chain molecules. If the current situation of the polymer molecular weight become irregular, polymer is composed of their molecular chain, is called linear polymers. If some macromolecular polymer chain with some long or short branched chain, the whole chain is dendritic, is called linear polymers with branched chain.
if there is some short chain polymer of macromolecular chain between them each other crosslinking, a three-dimensional network structure, the polymer called system. The molecular structure of polymer is different, its performance is also different, many performance of the plastic is closely related to the molecular structure of the polymer. No chemical bonds between polymer molecular chain if produced, the heat will soften and flow, hardens as it cools, and this process is reversible and can be repeatedly forming, traditionally called the polymer thermoplastics.
injection quality of machining parts with small, high specific strength, corrosion resistance, good chemical stability, has good electrical insulating properties, optical properties, antifriction and wear resistance and noise elimination damping performance, but also has good plasticity, easy molding and low cost advantages, has been widely used in industry and daily life, become the indispensable materials. Plastic is resin as the main component of macromolecule organic compound, also known as polymers, polymer for short.
thermoplastics due to the resin molecular chains are linear or branched structures, so has the elasticity and plasticity, before and after molding can swelling or dissolved in appropriate solvent. Some polymer in heating for the first time can soften and flow, heated to a certain temperature, will produce crosslinking curing reaction and harden, this change is irreversible, since then, the heating again already can't become soft, flowing, the polymer plastic called thermosetting plastic. Thermosetting plastic resin in the curing of former is linear or branched chain, after curing to form chemical bonds between molecular chain, become a three-dimensional reticular structure, not only can't melt, and also can't dissolve in the solvent.
more excellent articles: hollow blow molding mold structure, click directly.
http://www。 csssld。 cn//html/2017/Info_0713/631。 HTML
nantong on suye's official website: http://www. csssld。 Cn / /
more wonderful articles, immediately search: changshu da plastic products factory smoothly
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