# Characterisation of fibre and polymer

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```					 Characterization
of
Polymers and Fibres
R.Senthil Kumar,
Assistant Professor (SRG),
Department of Textile Technology,
KCT,Coimbatore-49,
sen29iit@yahoo.co.in
Introduction
• Characterisation of manufactured fibres is an
integral part of the production process.

• Characterisation of the products at various
stages of manufacture of fibres is essential for
achieving the desired quality of the final
products.
Textile Fibre Characterisation
• Characterisation at the molecular level

• Characterisation of thermal properties

• Characterisation of physical structure and
morphology
Characterisation at the Molecular level
Molecular weight averages:

•    Polymers are aggregates of large molecules comprising well-
defined repeat units.

•    The number of times the repeat unit occurs in a molecule is called
its DP (Degree of Polymerisation).

• DP multiplied by Mo (molecular weight of the repeat unit) is
equal to the molecular weight of the polymer.
Molecular Weight
Different kinds of averages of molecular weight
are:
Mn is defined as the total weight of all the
molecules in a given sample divided by
total number of molecules.

Mw is defined as the total of the number
of molecules multiplied by the square of
molecular weight of all the species divided
by the total weight of all the species of the
molecules present in the given sample.

Mz is defined as the total of the number of
molecules multiplied by the cube of
molecular weight of all the species divided
by the square of molecular weight of all the
species of the molecules present in the
given sample.
Example of molecular weight calculation

a. 9 moles, molecular weight (Mw) = 30,000

5 moles, molecular weight ( Mw) = 50,000

(9 mol x 30,000 g/mol) + (5 mol x 50,000 g/mol)
Mn=                                                      = 37,000 g/mol
9 mol + 5 mol

9 mol(30,000 g/mol)2 + 5 mol(50,000 g/mol)2
Mw =                                                      = 40,000 g/mol
9 mol(30,000 g/mol) + 5 mol(50,000 g/mol)
a. Some natural polymer (monodisperse) :
All poly
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Description: Characterisation of fibre and polymer - physical structure,thermal,microscope
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i did m.tech in IIT delhi.Atpresent working as senior lecturer in KCT coimbatore.I am having 6 years of industrial experience in areas such as production,R & D and maintenance departments of yarn manufacturing unit.