Fibre Reinforced Polymer.

Fibre Reinforced Polymer;

Fibre reinforced polymer are also called fibre reinforced plastic.
A composite is a combination of two or more materials which differ in form or composition on a macroscale.
Fibre reinforced polymer (FRP) is a composite that consist of high performance fibres embedded in a polymer matrix.
Fibres utilized in FRP are carbon, glass and aramid.
Polymers utilized in FRP are epoxy, vinyl ester, polyester and phenol formaldehyde resins.
Fibre reinforced composites can have different arrangement of fibres within the polymer.

(a) One dimensional arrangement;

Here the fibres are only aligned in X-direction.

(b) Two dimensional arrangement, random;

Here the fibres are randomly aligned in X-direction and Y-direction.

(c) Two dimensional arrangement, oriented;

Here the fibres are aligned in X-direction and Y-direction in a particular manner.

(d) Three dimensional arrangement, random;

Here the fibres are randomly aligned in X-direction, Y-direction and Z-direction.

Different arrangement of fibres within the polymer.

The function of polymer in the composite is to transfer stress between reinforcing fibres and to protect the fibres from mechanical and environmental damage.
Carbon and aramid fibres exhibit good chemical resistance. Glass fibres can be damaged in alkaline media.
Carbon and glass fibres are not affected by UV rays. Aramid fibres lose color and strength on exposure to UV rays.
FRPs are commonly used in the aerospace, automotive, marine, and construction industries.
FRPs are commonly found in ballistic armour.

Comments

Difference between organic and inorganic polymers.

Difference between organic and inorganic polymers. Definition Organic polymers are the polymers that essentially contain carbon atom in the backbone. Inorganic polymers are the polymers that have no carbon atom in the backbone. Structure Most organic polymers have simple structures. Almost all inorganic polymers are highly branched and have complex structures. Electrical Conductivity In most of the aqueous solutions, organic polymers are typically poor conductors of electricity and heat. Inorganic polymers in aqueous solutions are good conductors of electricity, this is because they have high ability to ionise and this makes them better conductors. Flammability Organic polymers are flammable whereas inorganic polymers are nonflammable. Effect on nature Organic polymers are environmental friendly as these are biodegradable. Inorganic polymers are not environmental friendly as these are non biodegradable. Examples Organic polymers include polysaccharide...

Determination of molecular weight by osmotic pressure method

Determination of molecular weight by osmotic pressure method. Osmotic pressure method is also called membrane osmometry. This method is widely used to determine the number average molecular weight of polymers. This method is based on the phenomenon of osmosis. If a pure solvent is separated from a solution through a semipermeable membrane, due to concentration (chemical potential) difference between the solvent and solution, the solvent will flow into the solution through semipermeable membrane. The pressure applied on the solution to completely stop the flow of solvent into it through semipermeable membrane is called osmotic pressure. The theory of osmotic pressure also applies to a solution of polymers. Ordinary solution obeys Van't Hoff equation i.e π=cRT/M Where π is osmotic pressure, c is concentration in mass per unit volume, R is gas constant, T is temperature and M is molar mass. The polymer solution are non ideal. Taking into account their deviation and us...

Determination of molecular weight of polymers by viscosity method.

Determination of molecular weight of polymers by viscosity method. It is a simple method for determining the molecular weight of polymers. Addition of polymers in the solvent increases the viscosity of the solvent, due to introduction of inhomogeneities by the polymers. If η₀ is the viscosity of the solvent and η is the viscosity of the solution at the same temperature, then the relative viscosity is given by Relative viscosity. Specific viscosity: It is defined as the relative increase in viscosity and is given as Specific viscosity. Reduced viscosity: It is defined as the relative increase in viscosity per unit concentration (C) of polymer and is given as Reduced viscosity. Intrinsic viscosity: The reduced viscosity is dependent on concentration (C). If a graph is plotted between reduced viscosity vs concentration then the extraplotation value when C=0 is called intrinsic viscosity. Intrinsic viscosity. Graph of reduced vi...

Polymers

Search This Blog