Polypropylene Chemical Properties
- WGK Germany
- HS Code
- Hazardous Substances Data
- 9003-07-0(Hazardous Substances Data)
- LD50 intraperitoneal in rat: > 110gm/kg
Polypropylene Usage And Synthesis
Translucent, white solid.Tensile strength 5000 psi, flexural strength 7000 psi, usable up to 121C. Insoluble in cold organic solvents; softened by hot solvents. Maintains strength after repeated flexing. Degraded by heat and light unless protected by antioxidants. Readily colored; good electrical resistance; low water absorption and moisture permeability; poor impact strength below ?9.4C; not attacked by fungi or bacteria; resists strong acids and alkalies up to 60C, but is attacked by chlorine, fuming nitric acid, and other strong oxidizing agents. Combustible, but slow-burning. Fair abrasion and good heat resis- tance if properly modified. Can be chrome-plated, injectionand blow-molded, and extruded.
Polypropylene is a low-density resin that offers a good balance
of thermal, chemical, and electrical properties, along with
moderate strength. Strength can be significantly increased by
using reinforcing agents such as glass fiber. Polypropylene has
limited heat resistance, but it can be used in applications that
must withstand boiling water or steam sterilization.
Polypropylenes can resist chemical attack and are unaffected by aqueous solutions of inorganic salts or mineral acids and bases, even at high temperatures. They are not attacked by most organic chemicals, and there is no solvent for these resins at room temperature. The resins are attacked, however, by halogens, fuming nitric acid, other active oxidizing agents, and by aromatic and chlorinated hydrocarbons at high temperatures .
Polypropylene is translucent and autoclavable. Properties can be improved by compounding with fillers, by blending with synthetic elastomers, and by copolymerizing with small amounts of other monomers.
Polypropylene (PP) is a thermoplastic material used in a wide variety of applications including packaging, labeling, textiles, etc. Due to high processability and low cost, PP is one of the most extensively produced polymers, especially, for auto industry. Pristine PP is resistant to photo-oxidation and thermal oxidation at moderate temperatures. However, PP is sensitive to various external aging environments (such as heat, light, and radiation), and, hence, has a relatively low service temperature.When PP is exposed to high temperatures or to an irradiation environment, the tertiary hydrogen atoms present in PP chains are susceptible to be attacked by oxygen. It is well known that PP oxidation depends on both light and temperature in outdoor aging conditions. PP can also be photo-degraded because several molecular chains are affected in the wavelength range from 310 to 350 nm.
Used with ram- and screw-injection machines. For automotive, housewares, general molding products and multi- and monofiliment fiber.
General extrusion grade polymer.
Base polymer in hot melt adhesives and paper-laminating, extender and viscosity modifier in caulks and sealants and waterproofing agent in wire and cable applications.
Modifier for waxes to reduce blocking, scuffing and abrasion. Improves pigment dispersion in polypropylene films and fibers.
ChEBI: A polymer compose of repeating propane-1,2-diyl units.
polypropylene: Anisotactic polymer existing in bothlow and high formula-weight forms.The lower-formula-weight polymer ismade by passing propene at moderatepressure over a heated phosphoricacid catalyst spread on aninert material at 200°C. The reactionyields the trimer and tetramer. Thehigher-formula-weight polymer isproduced by passing propene into aninert solvent, heptane, which containsa trialkyl aluminium and a titaniumcompound. The product is amixture of isotactic and atacticpolypropene, the former being themajor constituent. Polypropene isused as a thermoplastic mouldingmaterial.
In PP production, propylene monomer is polymerized to
make the homopolymer by using a Ziegler–Natta type coordination
catalyst. This catalyst results from the reaction and
interaction of a transition metal compound and an organometallic
compound, usually an alkylaluminum compound.
Halide atoms are involved in most such catalyst systems .
Polypropylene can be made by solution, slurry (or solvent), bulk (or liquid propylene), or gas-phase polymerization, or a combination of these processes . The most widely used is the slurry process; however, the current trend is toward the gas-phase process. In the solution, slurry, and bulk processes, the catalyst system is mixed with propylene and a hydrocarbon diluent (usually hexane, heptane, or liquid propylene) in a reactor. After polymerization, the reaction mixture enters a flash tank where unreacted propylene is removed and recycled. Propylene–ethylene copolymers [9010-79-1] can be manufactured when ethylene is fed along with propylene to the polymerization reactor or by adding ethylene and propylene to a postpolymerization reactor that contains PP. This mixture may then be purified to remove lowmolecular weight and atactic fractions and washed to remove catalyst residues. The polypropylene resin is then dried and pelletized. During this time, additivesmay be incorporated in the gas-phase process; no liquid diluent is used .
Tan to white odorless solid. Less dense than water and insoluble in water. Hence floats on water.
Air & Water Reactions
Insoluble in water.
Polypropylene reacts with chlorine, fuming nitric acid and other strong oxidizing agents.
No apparent toxicity
Polypropylene is similar in structure to polyethylene,but every other carbon atom has oneof its H2 atoms replaced by a CH2group.Although electrically similar to polyethylene,polypropylene can be made in thinner films, say 5μm as against about 25 μm for polyethylene.These films replace paper for impregnatedcapacitors, with reduced loss.
Moderately toxic by ingestion and intraperitoneal routes. Questionable carcinogen. When heated to decomposition it emits acrid smoke and irritating fumes. Used in injection molding for auto parts, in bottle caps, and in container closures.
No data on the carcinogenicity and mutagenicity of propylene are available for evaluation by the working group.
Polypropylene Preparation Products And Raw materials
- PHENOL-FORMALDEHYDE RESIN
- Polyvinyl chloride
- PELLET PESTLE POLYPROPYLENE DISPOSABL&
- ONE WELL POLYPROPYLENE INTERLOCKING RAC&
- NEEDLES, DISPOSABLE, 22-GAUGE, 1IN. LONG , ALL-POLYPROPYLENE LUER-FITTING HUB
- BIS[(3-METHYLDIMETHOXYSILYL)PROPYL]POLYPROPYLENE OXIDE
- PK100 250UL POLYPROPYLENE INSERT W/PLAS&
- PELLET PESTLE, POLYPROPYLENE,*DISPOSABLE FITS 1.5ML
- PK1000 0.75ML POLYPROPYLENE S/T VIAL
- PK100 10MM SOLID CAP,FOIL LINED,BLACK POLYPROPYLENE
- PCR PLATES POLYPROPYLENE 96-WELL
- PK100 500UL POLYPROPYLENE SNAP RING VIAL
- PK100 11MM POLYPROPYLENE GC SNAP CAP PT&
- PK100 0.75ML POLYPROPYLENE S/T VIAL
- Polyacrylamide dry powder,cationic
- 400-610-6006; 021-67582000
- 400 638 7771