1.Definition
The
main components of polymer plastics are mainly polymer compounds, whose
molecular weight is about 1 000, which is only for the physical concept. At
present, polymer plastics are widely used, but the daily use of plastic is
synthesized by polymer compounds, usually called high or macromolecule, is
synthesized by monomer raw materials or raw materials into integrated
materials, and through the later development, and fusion resin, color,
stabilizer and other additives. The shape of polymer plastic can be changed
freely and can be designed according to the user's requirements.
2.Characteristics
Polymer
plastics not only have their own unique, that is, arbitrary changes in the
shape, but also have viscoelasticity. Polymer plastic, if subjected to external
forces, its body will produce high elastic deformation, viscous flow, polymer plastic deformation is mainly related to time. In addition, polymer plastic
also has high specific strength, low strength and other characteristics, the
strength of polymer plastic is generally lower, but its density is lower, so
the strength becomes higher. Polymer has many characteristics, such as high
stability, high wear resistance, expansion, high insulation, so it is widely
used in various fields, by many people's favor.
The
types of polymer plastics are also diverse. At present, the classification of
polymer plastics in China mainly includes seven categories: rubber, polymer
coatings, polymer materials, matrix composites, plastics, fibers and plastics.
a.
Rubber.
The
price of rubber molecular chain is small, flexible, this is from the point of
view of the field of physics. Rubber with the size of the external force will
change its shape, with instability, if the external force removed, the original
state of rubber can be quickly restored.
b. Polymer
adhesive.
The
adhesive materials of polymer adhesive are mainly natural compounds. In
practice, it is usually divided into two kinds: natural, synthetic adhesive. The
most widely used is synthetic adhesive.
The
main components of polymer coatings are mainly polymers, which are made in a
relatively simple way, mainly adding solvents or additives in its production
process. Polymer coating is divided into 3 kinds commonly, namely grease,
synthetic resin and natural resin, often use in daily life.
The commonly
used high molecular weight materials mainly include high molecular enzyme and
high molecular transparent materials. Polymer
materials have certain functions: energy, material, information conversion,
transmission and magnetism.
e.
fiber.
Fiber is
common in daily life, usually divided into two kinds: natural fiber and
chemical fiber. Fiber has the characteristics of small deformation force, small
secondary valence force and high modulus in physical concept.
f.
Plastics.
Plastic is a
kind of material that USES more at present, also be the commonest material. The
main components of plastics are usually synthetic resins, natural polymers, and
the integration of other additives, such as plasticizers, fillers and so on. Plastic
is generally based on synthetic resin, so it can be divided into thermosetting
plastic, thermoplastic.
3. Physical
properties
In general, if
the polymer plastic placed in isothermal conditions, easy to produce the
product. In the actual processing, the crystallization temperature is not
completely consistent. If the crystallization temperature difference is large,
it will affect the crystallization process. At the same time, high stress is often
formed in the process of spinning forming, film stretching forming and
extrusion forming, which leads to the tendency of accelerating the product. In
addition, plastics apply techniques in shear stress. And under the influence of
tensile stress, the melt will form longer fibrous crystals. The higher the
stress and strain rates are, the more elongated chains and the higher the
melting point.
4. Chemical
properties
Generally
speaking, if the polymer plastics are placed in high stress and high
temperature conditions, the molecular structure will have some changes. In this
reaction, polymer plastics usually release a large amount of degraded
substances, thus releasing more harmful substances. To this end, in the
processing should be clear raw material indicators, choose high-quality raw
materials. At the same time, a small amount of antioxidant and stabilizer can
be added in the formula to improve the anti-degradation performance of the
polymer.
No comments:
Post a Comment