9002-88-4
| Name | Poly(ethylene) |
| CAS | 9002-88-4 |
| EINECS(EC#) | 200-815-3 |
| Molecular Formula | [C2H4]n |
| MDL Number | MFCD00084423 |
| Molecular Weight | 28.0532 |
| MOL File | 9002-88-4.mol |
Chemical Properties
| Appearance | solid; appearance depends upon method of forming; |
| Melting point | 92 °C |
| Boiling point | 48-110 °C(Press: 9 Torr) |
| density | 0.962 g/mL at 25 °C |
| refractive index | 1.51 |
| Fp | 270 °C |
| storage temp. | ?20°C |
| form | powder |
| color | White |
| Specific Gravity | 0.95 |
| Stability: | Stable, but breaks down slowly in uv light or sunlight. Incompatible with halogens, strong oxidizing agents, benzene, petroleum ether, aromatic and chlorinated hydrocarbons, lubricating oils. |
| Water Solubility | Soluble in acetone and benzene. Insoluble in water. |
| Merck | 14,7567 |
| Dielectric constant | 2.2（Ambient） |
| Uses |
Polyethylene (PE) is a thermoplastic polymer consisting of long hydrocarbon chains. PE is used in a number of applications including flexible film packaging produced by the blown film process. Significant differences in physical properties have been observed in linear low density polyethylene (LLDPE), low density polyethylene (LDPE), and high density polyethylene (HDPE) blown films. Structural parameters, such as density/ crystallinity, molecular weight and its distribution, short chain branching (SCB)/ long chain branching (LCB) length and amount, and crystallinemorphology are the key factors that control the properties. HDPE is the most crystalline PE, since its chains are linear and contain very little branching. There are many intrinsic factors affecting polymer degradation. Such factors include the number of branching of the polymer, the molecular weight, the hydrophobicity/hydrophilicity ratio, the crystallinity, and the morphology of the polymer. There are several publications that study the degradation of PE and the alteration of plastic surfaces in the laboratory or under controlled conditions in the field.
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| IARC | 3 (Vol. 19, Sup 7) 1987 |
| NIST Chemistry Reference | Polyethylene(9002-88-4) |
| EPA Substance Registry System | Ethene, homopolymer(9002-88-4) |
Safety Data
| Safety Statements | |
| WGK Germany | 3 |
| RTECS | TQ3325000 |
| TSCA | Yes |
| HS Code | 39041090 |
| Safety Profile |
Questionable
carcinogen with experimental tumorigenic
data by implant. Reacts violently with F2.
When heated to decomposition it emits
acrid smoke and irritating fumes.
|
| Hazardous Substances Data | 9002-88-4(Hazardous Substances Data) |
Raw materials And Preparation Products
Raw materials
Preparation Products
- 3-Chloroperoxybenzoic acid
- Acetyl ketene
- Poly(ethylene glycol)
- Tetrabutylammonium fluoride
- polyethylene conductive plastics
- Pigment Yellow 12
- polypyrrole-polyvinyl chloride composite film
- Master-batches
- ribonucleic acid for injection
- UV-photoxidation degradation film containing FeDBC photosensitize
- POLYETHYLENE, CHLORINATED
- Plastic products
- polyethersulfone ultrafiltration membrane
- detergent 801
- one-component moist curing PU sealant
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Hazard Information
Chemical Properties
Uses
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Definition
Uses
Industrial uses
Polyethylene thermoplastic resins include lowdensity polyethylenes (LDPE), linear low-density polyethylenes (LLDPE), high-density polyethylenes (HDPE), and ethylene copolymers, such as ethylene-vinyl acetate (EVA) and ethylene- ethyl acrylate (EEA), and ultrahighmolecular- weight polyethylenes (UHMWPE). The basic properties of polyethylenes can be modified with a broad range of fillers, reinforcements, and chemical modifiers, such as thermal stabilizers, colorants, flame retardants, and blowing agents. Major application areas for polyethylenes are packaging, industrial containers, automotive, materials handling, consumer products, medical products, wire and cable insulation, furniture, housewares, toys, and novelties.
LDPE, the first of the polyethylenes to be developed, has good toughness, flexibility, low-temperature impact resistance, clarity in film form, and relatively low heat resistance. Like the higher-density grades, LDPE has good resistance to chemical attack.
One of the fastest-growing plastics is linear LLDPE, used mainly in film applications but also suitable for injection, rotational, and blow molding. Properties of LLDPE are different from those of conventional LDPE and HDPE in that impact, tear, and heat-seal strengths and environmental stress-crack resistance of LLDPE are significantly higher. Major uses at present are grocery bags, industrial trash bags, liners, and heavy-duty shipping bags for such products as plastic resin pellets.
Rigidity and tensile strength of the HDPE resins are considerably higher than those properties in the low- and medium-density materials. Impact strength is slightly lower, as is to be expected in a stiffer material, but values are high, especially at low temperatures, compared with those of many other thermoplastics.
HDPE resins are available with broad, intermediate, and narrow molecular-weight distribution, which provides a selection to meet specific performance requirements. As with the other polyethylene grades, very-high-molecular- weight copolymers of HDPE resins are available with improved resistance to stress cracking.
Applications of HDPE range from film products to large, blow-molded industrial containers. The largest market area is in blowmolded containers for packaging milk, fruit juices, water, detergents, and household and industrial liquid products. Other major uses include high-quality, injection-molded housewares, industrial pails, food containers, and tote boxes; extruded water and gas-distribution pipe, and wire insulation; and structural-foam housings. HDPE resins are also used to rotationally mold large, complex-shaped products such as fuel tanks, trash containers, dump carts, pallets, agricultural tanks, highway barriers, and water and waste tanks for recreational vehicles.
Production Methods
Linear PE is produced by a low-pressure solution or gasphase process that is initiated by a variety of transition metal catalysts. The most common catalysts are Ziegler titanium compounds with aluminum alkyls and Phillips chromium oxide-based catalysts. The gas-phase and slurry processes are used to produce high molecular weight, high-density (HMW-HDPE) products. The highest density linear PEs can be made from an α-olefin comonomer, typically octene for the solution process and butene or hexene for the gas-phase process. Linear PE does not have long-chain branches and is therefore more crystalline. The short-chain branches found in linear PE serve as tie molecules, which give the higher α -olefin copolymers improved puncture and tear properties. Included in the linear PE family are ultra-low-density PE (ULDPE), LLDPE, and HDPE.
HDPE’s main use is in blow-molded products such as milk bottles, packaging containers, drums, car fuel tanks, toys, and houseware. Film and sheet are widely used in wrappings, refuse sacks, carrier bags, and industrial liners. Injection molding products include crates, pallets, packaging containers, houseware, and toys. Extrusion grades are used in pipes, conduit, wire coating, and cable insulation.
LLDPE is a thermoplastic that in many applications replaces its predecessor, low-density polyethylene (LDPE), or is used in blends with LDPE. In particular, LDPE’s shortchain branching gives it higher tensile strength, puncture, and anti-tear properties, making it especially suitable for film applications.
General Description
Agricultural Uses
Carcinogenicity
Solubility in organics
Purification Methods
Supplier
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