Introduction: of Terlon fiber is 2.5-3.5GPa. · Dynamic

Introduction:

                        In 1970, high
strength and stiffness aromatic fiber search was began in Russia by Prof.

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Georgy I. Kudryavtsev. This research produce three type of fibers.

·     
Terlon
is a amid fiber based on copolymer of poly-(p-phenylene terephthalamide)
(PPTA) including diamines.

·     
SVM
(Vnivlon) is based on aromatic heterocyclic polyamide (PHA) of principal
chemical constitution ?

?   
NH Ar1 NH CO Ar2 CO

            In 1969, first publication was
written about PHA fiber Vnivlon.

·     
Armos is
based on aromatic heterocyclic copolyamide of principal chemical constitution?

 NH Ar1
NH CO Ar2 CO?

 NH Ar3
NH
CO
Ar2
CO ?

Aroma fiber have high tenacity and having high thermal and fire resistant
properties as compare to SVM.

Fiber Structure:

                        Fiber
structure are different on all molecular, super molecular and micro level.

 

Terlon fiber structure:

ON molecular level, Terlon is PPTA
and copolymer based. Its statistical segment is 30-50 nm. Main polar group of
Terlon is CONH.

ON
super-molecular level, Terlon extended chain are in 3D crystalline order. Their
chains are highly oriented. In Terlon Stress-holding molecular chains
proportion 0.6–0.75.

On
micro level, Terlon have round cross section and low heterogeneity,

 

SVM fiber structure:

              ON molecular level, SVM is hetrocyclic
paraaramid based fiber. Its statistical segment is 20-40 nm. . Main polar group
of SVM is CONH; N.

 ON super-molecular level, SVM extended chain
are in 1D crystalline order. Their chains are highly oriented. In SVM Stress-holding
molecular chains proportion 0.6–0.75.

              On micro level, SVM have round
cross section and low heterogeneity.

 

Armos fiber structure:

               ON
molecular level, Armos is hetrocyclic paraaramid copolymer based fiber. Its
statistical segment is 20-40 nm. . Main polar group of Armos is CONH; N.

  ON super-molecular level, Armos extended
chain non crystalline. In Armos Stress-holding molecular chains proportion
0.6–0.75.

 

                On micro level, Armos have
round cross section and low heterogeneity.

 

Mechanical Properties:

Terlon:

·     
Density of Terlon
fiber is 1.45-1.47g/cm3.

·     
Moisture content of
Terlon fiber is 2-3%

·     
Tenacity of Terlon
fiber is 2.5-3.5GPa.

·     
Dynamic
deformation modulus of Terlon fiber is 130-160GPa.

·     
Static deformation
modulus of Terlon fiber is 95-120GPa.

·     
Elongation at
break of Terlon fiber is 2.5-3%.

 

SVM:

·     
Density of SVM
fiber is 1.45-1.46g/cm3.

·     
Moisture content
of SVM fiber is 3.5-4.5%

·     
Tenacity of SVM
fiber is 4-4.5GPa.

·     
Dynamic deformation
modulus of SVM fiber is 130-150GPa.

·     
Static
deformation modulus of SVM fiber is 95-115GPa.

·     
Elongation at
break of SVM fiber is 3-3.5%

 

 

Armos:

·     
Density of Armos
fiber is 1.45-1.46g/cm3.

·     
Moisture content
of Armos fiber is 3-3.5%

·     
Tenacity of Armos
fiber is 4.5-5.5GPa.

·     
Dynamic
deformation modulus of Armos fiber is 140-160GPa.

·     
Static
deformation modulus of Armos fiber is 100-120GPa.

·     
Elongation at
break of Armos fiber is 3.5-4%.

 

Thermal Properties:

           In case of
terlon as temp increase and time decrease, tenacity and elongation at break
also decrease. At 300C for 100 hours tenacity of terlon is 27 and elongation at
break is 33%. But at 200C for 1500 hours tenacity is 65.7 and elongation at
break is 57.1. Similar In case of Armos as temp increase and time decrease,
tenacity and elongation at break also decrease. At 300C for 100 hours tenacity
of Armos is 27.5 and elongation at break is 39.2%. But at 200C for 1000 hours
tenacity is 82.9 and elongation at break is 109.8.

 

 

Thermal Characteristics:

Terlon:

·      Ignition temperature of Terlon is 450-500C.

·      Self-ignition temperature is 500-600C.

·      Limiting oxygen index is 27-30%

·      Destruction temperature of Terlon is 450-550C.

·      Glass transition temperature of Terlon is 345-360C.

 

SVM:

·      Ignition temperature of SVM is 500-600C.

·      Self-ignition temperature is 550-650C.

·      Limiting oxygen index is 41-43%

·      Destruction temperature of SVM is 450-550C.

·      Glass transition temperature of SVM is 270-280C.

 

Armos:

·      Ignition temperature of Armos is 500-600C.

·      Self-ignition temperature is 550-650C.

·      Limiting oxygen index is 39-42%

·      Destruction temperature of Armos is 450-550C.

·      Glass transition temperature of Armos is 220-240C.

 

 

As we
increase temperature, loss of strength of these fibers also high. In case of
Armos, strength and elongation at break is slightly higher than for Terlon.

Terlon is less fire resistant as compare to SVM and
Armos because SVM and Armos has nitrogen-containing heterocyclic structure. 

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