Question 02 (Textile Engineering & Fibre Science)
The byproduct obtained from polycondensation of diethylene glycol terephthalate (DGT) is
| (A) | Glycolic acid |
| (B) | Water |
| (C) | Diethylene glycol |
| (D) | Ethylene glycol |
[Show Answer]
D
Frequently Asked Questions | FAQs
What is the polymerization process of PET?
Polyethylene terephthalate (PET) is a thermoplastic polyester polymer that is commonly used in the production of various products such as bottles, containers, and films. The polymerization process of PET involves the following steps:
Production of the monomers: The two main monomers required for PET production are terephthalic acid (TPA) and ethylene glycol (EG). TPA is produced by oxidation of para-xylene, while EG is produced from ethylene through a hydration process.
Purification of the monomers: The TPA and EG monomers are purified to remove any impurities that may affect the quality of the final PET product.
Esterification: The purified TPA and EG monomers are mixed and then reacted in the presence of a catalyst to produce a prepolymer, which is an intermediate product of PET. This reaction is called esterification, and it involves the formation of ester bonds between the TPA and EG monomers.
Polymerization: The prepolymer is then heated and polymerized under vacuum conditions to produce PET. The polymerization reaction involves the condensation of the prepolymer molecules, which results in the formation of long polymer chains.
Solid-state polymerization: To improve the mechanical properties and molecular weight of the PET, the polymer is subjected to a solid-state polymerization process, which involves heating the PET at high temperature under vacuum conditions.
Processing: The PET polymer can then be processed into various products, such as bottles or films, using techniques such as injection molding or extrusion.
Overall, the polymerization process of PET involves the chemical reaction between TPA and EG monomers to form a prepolymer, which is then polymerized to produce PET.
What is the polymerization of ethylene terephthalate?
Polyethylene terephthalate (PET) is a thermoplastic polymer that is commonly used in the production of various products such as bottles, containers, and films. The polymerization process of PET involves the following steps:
Production of the monomers: The two main monomers required for PET production are terephthalic acid (TPA) and ethylene glycol (EG). TPA is produced by oxidation of para-xylene, while EG is produced from ethylene through a hydration process.
Purification of the monomers: The TPA and EG monomers are purified to remove any impurities that may affect the quality of the final PET product.
Esterification: The purified TPA and EG monomers are mixed and then reacted in the presence of a catalyst to produce a prepolymer, which is an intermediate product of PET. This reaction is called esterification, and it involves the formation of ester bonds between the TPA and EG monomers.
Polymerization: The prepolymer is then heated and polymerized under vacuum conditions to produce PET. The polymerization reaction involves the condensation of the prepolymer molecules, which results in the formation of long polymer chains.
Solid-state polymerization: To improve the mechanical properties and molecular weight of the PET, the polymer is subjected to a solid-state polymerization process, which involves heating the PET at high temperature under vacuum conditions.
Processing: The PET polymer can then be processed into various products, such as bottles or films, using techniques such as injection molding or extrusion.
Overall, the polymerization process of PET involves the chemical reaction between TPA and EG monomers to form a prepolymer, which is then polymerized to produce PET.