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How does Polyester Change at High Temperatures?

Mar. 31, 2020

Polyester has good thermoplastic properties and produces different changes at different temperatures. The thermal change of polyester is between the thermal change of amorphous and crystalline polymer compounds. It is above the glass transition temperature, and only certain segments with small inter-molecular forces in the amorphous region can move.


Polyester has good thermoplastic properties and produces different changes at different temperatures. The thermal change of polyester is between the thermal change of amorphous and crystalline polymer compounds. Above its glass transition temperature, only certain segments with small inter-molecular forces in the amorphous region can move. Molecular segments with large inter-molecular interaction forces are still difficult to move. Of course, the molecular chains in the crystalline region cannot move. Therefore, the fiber only appears to be more flexible, but it may not be as elastic as the highly elastic state.


So how does polyester change at high temperatures? Woven Polyester Twill Dyed Fabric Supplier will tell you next.


When the heating is continued to 230-240 ℃, the softening point of the polyester is reached, the molecular chain movement of the amorphous region of the polyester is intensified, and the forces of the molecular interaction are dismantled. The segment has not yet been disassembled, so the fiber only softens, not melts, but the use value of the fiber has been lost at this time, so it is not allowed to exceed this temperature in the printing and dyeing process.


Printed Polyester Fabric is achieved by using heated molecular chains in the amorphous region. However, the temperature must be strictly controlled. If it exceeds the allowable range, the fabric feels rough. When the polyester is exposed to a high temperature of 258-263°C, the molecular segments in the polyester crystal region also start to move, and the fibers will melt. This temperature is polyester. Of melting point.


Printed Polyester Fabric


Printed Polyester Fabric


When polyester is heat-set, the microstructure of the fiber changes due to different heat. When the setting temperature is 170-180°C, the absorption capacity of polyester for disperse dyes in the exhaustion dyeing process is very low. When it exceeds 180°C, the absorption rate of polyester to the dye is proportional to the temperature increase, which is related to the crystallization property of polyester Related, because at 170-180°C, the polyester crystallizes quickly, and because more crystals are formed, there is less dye on the dye, and the increase in temperature may cause the degree of orientation of macromolecules to decrease, so the absorption of dyes increases.


Polyester will hydrolyze under the action of high-temperature steam for a long time, the strength and dyeing properties of the fiber will decrease, but it can withstand a high temperature of 140°C in water and a dyeing bath using water as a medium.


The above is the change of polyester in high temperature introduced by Bedding Twill Printed Fabric Factory.

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