There are several configurations and structural formulas of polypropylene

According to the international standard classification, polypropylene (PP) is divided into homopolymer polypropylene (PP-H), block copolymer polypropylene (PP-B) and random copolymer polypropylene (PP-R).

Because homopolymer PP is very brittle at temperatures above 0, many commercial PP materials are random copolymers with 1-4% ethylene or clamp copolymers with higher ethylene content. Copolymer PP material has a lower thermal twisting temperature (100 °C), low transparency, low gloss and low rigidity, but has stronger impact strength. The strength of PP increases with the increase of ethylene content.

The Vicat softening temperature of PP is 150. Due to its high crystallinity, the material has good surface stiffness and scratch resistance. PP does not have the problem of environmental stress cracking.

Typically, PP is modified by the addition of glass fibers, metal additives or thermoplastic rubber. The flow rate of PP in the MFR range is 1-40. PP materials with low MFR have better impact resistance but lower elongation strength.

For materials with the same mfr, the strength of the copolymer type is higher than that of the homopolymer type. Due to crystallization, the shrinkage of PP is quite high, generally. And the directional uniformity of shrinkage is much better than that of materials such as PE-HD.

The addition of 30% glass additives can reduce the shrinkage to: Both homopolymer and copolymer PP materials have excellent resistance to moisture absorption, acid and alkali corrosion, and solubility. However, it is not resistant to aromatic hydrocarbon (e.g. benzene) solvents, chlorinated hydrocarbon (carbon tetrachloride) solvents, etc.

PP is also not oxidant resistant at high temperatures like PE.

Classification of polypropylene:

According to the position of the branched atoms, polypropylene can be divided into random structure, isometric structure, and inter-regular structure.

PolypropyleneThe structure is simplifiedis ch3-ch=ch2.

The monomer of polypropylene is propylene, and the structure is simplified: CH3-CH=CH2, propylene undergoes a polyaddition reaction, the double bond is broken, and it is connected to form a polymer compound.

Polypropylene is a colorless, odorless, non-toxic white waxy granular material, which resembles polyethylene.

But more transparent and lighter than polyethylene, with relative density.

for, is the lightest plastic variety.

Applications of polypropylene

Polypropylene has chemical resistance, heat resistance, electrical insulation, and high mechanical properties.

and good high wear-resistant processing performance of the local beam, which makes polypropylene since its inception, it has been rapidly used in machinery, automobiles, electronic appliances, construction, textiles, packaging, agriculture, forestry and fishery and food industries.

In recent years, with the rapid development of China's packaging, electronics, automobile and other industries, it has greatly promoted the development of China's industry. And because of its plasticity, polypropylene material is gradually replacing wooden products, and high strength toughness and high wear resistance have gradually replaced the mechanical function of metal.

The above content reference: Encyclopedia - polypropylene.

The structure of propylene is ch-ch=ch2.

Propylene can be thought of as a hydrogen atom in an ethylene molecule.

Product after substitution by methyl group. In the propylene molecule, the three carbon atoms are not collinear and have 6 or 7 atoms coplanar due to the planar structure of vinyl (-ch=ch2) and the trigonal pyramidal shape of methyl group.

Propylene Introduction:

Propylene is a kind of organic compound, the molecular formula is C3H6, it is a colorless, odorless, slightly sweet gas, flammable calendar, and the limb macro will produce a bright flame when burning, the best limit in the air.

Be; Insoluble in water, soluble in ethanol.

Ethyl ether. Propylene is one of the three basic raw materials for synthetics, and the largest amount is used in the production of polypropylene.

Other than that. Propylene can be used to prepare acrylonitrile, propylene oxide, and isopropanol.

Phenol, acetone.

Butanol, octanol, acrylic acid and its esters, propylene glycol, epichlorohydrin and synthetic glycerin, etc.

The propylene structure formula is:

Propylene, also known as methylethylene, has a simple structure of CH2 CHCH3, colorless flammable gas, with a sweet taste, a melting point, a boiling point, a relative density of liquid state, and easy liquefaction. The molecule contains unsaturated carbon-carbon double bonds, which can undergo addition reactions with hydrogen, halogen, hydrogen halide, etc., and can also undergo polyaddition reactions. Insoluble in water, soluble in organic solvents.

Uses of propylene1. Polypropylene in the form of polymerization wax collapse is used for plastics and carpet fibers.

2. Chemical intermediates used in the manufacture of acetone, cumene, isopropanol, isopropyl halide, propylene oxide, acrylonitrile and cumene.

3. Almost two-thirds of the propylene produced is used to produce polypropylene, which is a plastic material that accounts for 25% of all plastic products today.

4. It can be used as fuel.

5. As a propellant and component of aerosol wheel fiber rubber.

The above content reference: Encyclopedia-Propylene.

PolypropyleneThe chemical formula is (C3H6)N.

Physicochemical Properties:

Polypropylene, referred to as PP, is a colorless, odorless, non-toxic, translucent solid substance. Polypropylene is a thermoplastic synthetic resin with excellent performance, which is a colorless and translucent thermoplastic lightweight general plastic. It has chemical resistance, heat resistance, electrical insulation, and high-strength mechanical properties.

and good high wear-resistant processing performance.

Applications:

China's main slag sources use polypropylene as a material in food packaging, household goods, automobiles, optical fibers and other fields. The largest area of polypropylene use in China is woven bags, packaging bags, strapping ropes and other products, accounting for about 30% of total consumption. In recent years, with the development of polypropylene injection molded products and packaging films, the proportion of polypropylene used in woven products has declined, but it is still the area where polypropylene is consumed the most.

The above content reference: Encyclopedia - polypropylene.

The propylene structure formula is:

Propylene is also known as methylethylene.

The structure is simple CH2 CHCH3, non-collapsing flammable gas, with sweet taste, melting point is , boiling point is , relative density is in liquid state, and it is easy to liquefy. The vertical dust molecule contains unsaturated carbon-carbon double bonds, which can be combined with hydrogen and halogens.

Addition reactions such as hydrogen halide can also occur. Insoluble in water, soluble in organic solvents.

Uses of propylene1. Polypropylene in the form of polymerization.

For plastics and carpet fibers.

2. It is used to make acetone.

Cucumene, isopropyl alcohol.

Isopropyl halides, propylene oxide, acrylonitrile.

A chemical intermediate of the round cumene.

3. Almost two-thirds of the propylene produced is used to produce polypropylene, which is a plastic material that accounts for 25% of all plastic products today.

4. It can be used as fuel.

5. As an aerosol.

propellants and components.

The above content reference: Encyclopedia-Propylene.

<> polystyrene (abbreviated PS) refers to the polymer synthesized from styrene monomer through free radical polyaddition. It is a colorless and transparent thermoplastic with a glass transition temperature of more than 100 °C, which is often used to make a variety of disposable containers that need to withstand the temperature of boiling water, as well as disposable foam lunch boxes.