Physical properties of acetate fibers

Physical properties:

acetate fibers

Tenacity:

Both types of acetate fibers are weak due to the amorphous nature of their polymer system, which limits the number of inter polymer forces of attraction which can occur..

Tenacity of acetate fiber 1.1-1.3  gm/den when dry and 0,65-0-75gm/den when wet and for triacetate fibre 1.2-1.4  gm/den when dry and 0.7-0.8  Gm /den when wet.

2      Elastic- plastic nature:

Both acetate and triacetate are plastic because of the fiber amorphous polymer system.

3  Elongation: For acetate fiber 23-45% (standard) when dry and 35-45% when wet and for triacetate fiber 25-30% when wet.

4      Hygroscopic nature:

Despite their very  amorphous polymer system, both acetate and triacetate fibers have only a fair of moisture absorbency because of the relatively low polarity of the acetate and triacetate  polymers.

Standard moisture regain of fibers is about 6.5% and for triacetate, regain before 4.5%, after treatment 2.5-3.0%

Thermal properties:

Acetate	Triacetate
It is thermoplastic mtls. It becomes sticky at 190°c. It becomes soft at 205°c. It melts about 232°c. It is not readily flammable.	It is thermoplastic. Heat treatment of triacetate increases the crystallinity and molecular orientation.  It ‘s softening point 225°c.  Melting point 300°c.