POLYISOPRENE
POLYISOPRENE
CAS: 9003-31-0
Molecular Formula: C5H8
POLYISOPRENE - Names and Identifiers
POLYISOPRENE - Physico-chemical Properties
| Molecular Formula | C5H8 |
| Molar Mass | 68.12 |
| Density | 0.92g/mLat 25°C |
| Melting Point | 64 °C |
| Boling Point | 122-142°C(lit.) |
| Flash Point | >230°F |
| Appearance | slab/chunk |
| Storage Condition | 2-8°C |
| Refractive Index | n20/D 1.521 |
POLYISOPRENE - Risk and Safety
| Hazard Symbols | T - Toxic |
| Risk Codes | R60 - May impair fertility R61 - May cause harm to the unborn child R10 - Flammable R20/21 - Harmful by inhalation and in contact with skin. R38 - Irritating to the skin |
| Safety Description | S24/25 - Avoid contact with skin and eyes. S7/9 - S45 - In case of accident or if you feel unwell, seek medical advice immediately (show the label whenever possible.) S36/37 - Wear suitable protective clothing and gloves. S16 - Keep away from sources of ignition. S53 - Avoid exposure - obtain special instructions before use. |
| UN IDs | UN 1307 3/PG 3 |
| WGK Germany | 3 |
| RTECS | VL8020000 |
POLYISOPRENE - References
| EPA chemical information | Information provided by: ofmpub.epa.gov (external link) |
| introduction | polyisoprene rubber is a synthetic rubber prepared by bulk polymerization or solution polymerization of isoprene monomer under the action of catalyst. Because its microscopic molecular structure is close to natural rubber, it is also commonly known as synthetic natural rubber. According to the different structure of isoprene units, polyisoprene rubber can be divided into cis-1, 4-polyisoprene rubber (isoprene rubber for short), trans-1, 4-polyisoprene rubber (also known as synthetic Eucommia rubber, Gutapo rubber or balata rubber), cis-3, 4-polyisoprene rubber and 1, 2-polyisoprene rubber 4 isomers, of which only cis-1, 4-polyisoprene rubber and trans-1, 4-polyisoprene rubber have been industrialized. In cis -1,4-polyisoprene rubber, according to the cis -1,4-structure content can be divided into high cis and medium cis polyisoprene rubber; according to the initiation system, it can be divided into Lithium, titanium and rare earth polyisoprene rubber, etc. high cis-1, 4-polyisoprene rubber is mainly used to replace natural rubber for the production of passenger car tires, semi-steel car radial tires and light truck radial tires, etc., in addition, it can also be used to produce conveyor belts, rubber tubes, tapes, sponges, adhesives, rubber shoes, wires and cables, sports equipment and medical materials. trans -1,4-polyisoprene rubber is mainly used to produce shock-absorbing products for tires, high-speed trains and automobiles, and can also be used to manufacture medical materials, shape memory materials and shoe materials. |
| polyisoprene rubber and its properties | when polyisoprene rubber is polymerized, due to the asymmetry of the monomer, different addition methods can be adopted to obtain 4 isomers with different microstructures, including cis -1,4-structure, trans -1,4-structure, 1,2-structure and 3,4-structure. Polyisoprene rubbers with different structures have different properties. Generally speaking, polyisoprene rubber refers to cis -1,4-structure polyisoprene rubber. The properties are similar to NR, and the properties of trans -1,4-structure polyisoprene rubber are similar to those of Eucommia rubber in nature. Among the 4 structures, 1,2-structure and 3,4-structure are currently not found in nature. So far, the structures used in polyisoprene rubber are high cis -1,4-structure, high trans -1,4-structure and 3,4-structure. The isomers of polyisoprene have different properties and are used in different places in life. High cis -1,4-polyisoprene rubber NR has the highest regularity and relative molecular mass, so the crystallization performance is the best, and a large number of crystals will be produced during stretching. Therefore, in the process of processing In order to reduce the relative molecular mass of NR, plasticizing should be carried out first. Synthetic high cis -1,4-polyisoprene rubber does not need to be plasticized because its regularity is lower than NR and its crystallization during stretching is less. High trans-1, 4-polyisoprene rubber Secondary rubber used for tread rubber has the characteristics of low rolling resistance and low heat generation, which meets the requirements of high-performance tires. The molecular chain of high trans -1,4-polyisoprene rubber has high trans-order, and the differential scanning calorimetry (DSC) curve is shown in Figure 2. In stage A, the crystal state is inelastic at room temperature, and there are mainly two crystal forms of α and β (see Figure 3); in stage B, the crystallization softens at 60 ℃, and returns to its original state after cooling; when the cross-linking degree reaches the critical value, the crystallization is blocked at room temperature, it shows the characteristics of soft elastomer. 3,4-polyisoprene rubber 3,4-polyisoprene rubber has the advantages of low elasticity, oil resistance and good water resistance. It is close to butyl rubber in terms of air permeability and water permeability. It is an ideal rubber for high-performance environmentally friendly tires. At present, due to the imperfect catalytic system and high production cost, it is only in the laboratory research stage. |
| Application | Polyisoprene rubber (IR) is a synthetic rubber prepared by solution polymerization of isoprene monomer under the action of a catalyst. It has similar chemical composition, three-dimensional structure and mechanical properties to natural rubber, as well as good original rubber strength, basic viscosity, aging properties and rebound properties, it is an important raw material to replace natural rubber in the manufacture of bias tires and radial tires. It is also widely used in the production of cord rubber, conveyor belts, mechanical products, hoses, tapes, sponges, adhesives, wires and cables, sports equipment, medical materials and Rubber shoes, etc., polyisoprene rubber can not only be used alone, but also can be used together with natural rubber or other synthetic rubbers. The application prospects are very wide. |
| production technology | at present, the production of polyisoprene rubber mainly adopts solution polymerization process, and the catalytic systems used in industry include Ziegler-sodium tower (aluminum-titanium) catalyst, organolithium catalyst and rare earth catalytic system composed of titanium chloride/hydrocarbyl aluminum. At present, most companies in the world mainly produce titanium-based polyisoprene rubber, and only Chinese and Russian manufacturers produce rare earth polyisoprene rubber. |
| Use | is an important raw material for manufacturing tires and other rubber products Mainly used in tire production |
| toxic substance data | information provided by: pubchem.ncbi.nlm.nih.gov (external link) |
Last Update：2024-04-09 21:54:55
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