What are the 2 main uses for alkenes?
Uses of Alkenes Manufacture of plastics like polythene for making buckets, bowls, bags etc. Manufacture of polystyrene used in making car battery cases and parts of the refrigerator. Making ethane-1,2-diol used as anti-freezing for motor car radiators.
Are alkenes used in plastic?
Plastics are polymers and are made by polymerisation. Example: poly(ethene) (often called polythene) is made by polymerising the simplest alkene, ethene. Plastic has to be sourced and goes through several processes before it is ‘workable’ and can be made into the different stock forms ready to be manufactured.
Why are alkenes good for plastic?
Alkene polymers and plastics Polythene, made from ethene, is very cheap and strong, and is easily molded. It is used to make, for example, plastic bags, bottles, and buckets. Polypropene, made from propene, has strong fibers and a high elasticity.
What are properties of Polyethanol?
Polyethylene (HDPE/LDPE) In general, polyethylenes offer excellent chemical and impact resistance, electrical properties and low coefficient of friction. It is considered a dielectric material. In addition, polyethylenes are lightweight, easily processed and offer near-zero moisture absorption.
What are the uses of alkenes?
Alkenes are used in the synthesis of alcohol, plastics, detergents or fuels, butadiene etc.
What are the physical properties of alkene?
Physical Properties of Alkenes
- Physical State. These double-bonded compounds are colourless and odourless in nature.
- Solubility. The alkenes are insoluble in water due to their nonpolar characteristics.
- Boiling Point.
- Melting Point.
What are alkenes used to make?
Alkenes can be used to make polymers . Polymers are very large molecules made when many smaller, reactive molecules join together, end to end. The smaller molecules are called monomers. The polymers formed are called addition polymers.
What type of polymer is made from alkenes?
This page looks at the polymerisation of alkenes to produce polymers like poly(ethene) (usually known as polythene, and sometimes as polyethylene), poly(propene) (old name: polypropylene), PVC and PTFE. It also looks briefly at how the structure of the polymers affects their properties and uses.
What are the industrial uses of alkenes?
|ethylene dichloride||solvent; production of vinyl chloride|
|vinyl chloride||manufacture of poly (vinyl chloride)—PVC|
|vinyl acetate||manufacture of poly (vinyl acetate) used in paint emulsions, plywood adhesives and textiles|
|polyethylene||“plastic” bags; toys; packaging|
What are the uses of Polyethene?
Principal uses are in packaging film, trash and grocery bags, agricultural mulch, wire and cable insulation, squeeze bottles, toys, and housewares.
What is PP plastic used for?
Polypropylene (PP) is a thermoplastic “addition polymer” made from the combination of propylene monomers. It is used in a variety of applications to include packaging for consumer products, plastic parts for various industries including the automotive industry, special devices like living hinges, and textiles.
Which alkene is used in the manufacturing of plastics?
The ethene and propene are important materials for making plastics or producing other organic chemicals. You will remember that during the polymeriation of ethene, thousands of ethene molecules join together to make poly(ethene) – commonly called polythene.
What are the chemical properties of alkenes?
Chemical Property of Alkenes Alkenes exist in all three solid-liquid and gaseous states. The boiling point of alkenes depends on the molecular structure, the longer the molecular chain, the higher will be its boiling point. Functional groups are responsible for the polarity of alkenes.
What are alkenes examples?
The first two alkenes in Table 13.1. 1, ethene and propene, are most often called by their common names—ethylene and propylene, respectively (Figure 13.1. 1). Ethylene is a major commercial chemical.
What are alkenes discuss important chemical properties of alkenes?
Chemical properties of alkenes: Alkenes are more reactive than alkanes due to the presence of a double bond. The σ- bond is strong but the π- bond is weak. The typical reactions of alkenes involve addition of an electrophile across the double bonds proceeding through ionic mechanism.
How can alkenes be used to make polymers?
1 Answer. Pressure and heat energy open the double bonds in the alkene and make it bond to form large polymer molecules.
How can alkenes be used to make polymers by addition polymerisation?
During the addition polymerization process, the pi bonds of the double bonds in each alkene molecule sort of break open, thereby allowing the free bonds to join with one another to form a chain known as poly(alkene) or polythene. This chain contains units that repeat themselves, known as repeating units.
What are the physical properties of alkenes?
How is the polythene manufactured give properties and uses?
LDP is prepared by polymerization of ethylene under high pressure (1000 – 2000 atm) and temperature (350 – 570 K) in presence of traces of O2 or peroxide as initiator. ii. The mechanism of this reaction involves free radical addition and H-atom abstraction. The latter results in branching.
What are the properties of polythene Class 8?
(a) The properties and uses of polythene are as follows: Properties: 1) It is water resistant. 2) It is strong but flexible and can be rolled into sheets and moulded into different shapes.