Characteristics of synthetic fibre

Both natural and man-made fibres are mainly composed of the compounds belonging to high polymers or macromolecules. Macromolecular structure is necessary for production of materials of high mechanical strength and high melting point. The natural fibres are found to consist chain molecules of linear macromolecular type. Further, the chain molecules are oriented into parallel bundles in the process of growth. Based on these investigations it is assumed that a polymer must satisfy minimum requirements, if it is to serve as a fibre. These requirements are mentioned below:


 

Properties  of synthetic fibre

Flexibility

The polymer must be a linear flexible macromolecule with a high degree of symmetry. The effective cross sectional diameter should be less than 15 A. The polymer should not contain any bulky side groups or chains.

 

Molecular Mass

The polymer must have a comparatively high molecular mass. The average length of its molecular chain should be in order of 1000 A or more


 Configuration

The molecule must have the capacity to adopt an extended configuration and state of mutual alignment.

 

 Crystallinity

 A polymer should have at least a high degree of intermolecular cohesive power. This indicates that the molecular chains should have sufficient number of sites of attraction.

 

 Orientation

A high degree of orientation of the molecules in the polymer is a pre- requisite for producing good tensile strength.



Previous Post Next Post