Difference Between Polyester and Polypropylene

Main difference

The main difference between polyester and polypropylene is that polyester is a polymer formed by condensation polymerization between a dicarboxylic acid and a diol while polypropylene is a thermoplastic polymer that is formed by addition polymerization of propylene…

Polyester vs Polypropylene

Polyesters are the polymers formed by condensation polymerization of dicarboxylic acid and diols. While polypropylene has the characteristic of a thermoplastic polymer and has applications to be used in plastics and fibers. The polyester monomers are dicarboxylic acid and diol; however, in the case of polypropylene, as its name implies, propylene is used as the monomer for its production. Polyesters are less hydrophobic than polypropylene. It means that polyester does not absorb much water while polypropylene, being hydrophobic, resists and does not absorb water at all. Polyester has a higher melting point than polypropylene.

The production of these two synthetic materials, since polyesters are formed by condensation polymerization, while polypropylene is formed by addition polymerization. The polyesters can be present in the form of semi-aromatic polymers, aliphatic polymers and aromatic polymers. While polypropylenes are present only in the form of aliphatic polymers. Polyesters are stronger and more durable compared to polypropylene, and with additional coatings, they can become stronger. Polyesters can be a bit expensive due to the material used in their production. However, polypropylene is simple to produce, cost-effective, and widely available. Polyesters are not mildew resistant. But nevertheless, additional coatings are used to achieve this goal. While on the other hand, polypropylenes have a great resistance to mold naturally.

Comparison chart

Polyester Polypropylene
Polymers formed by condensation polymerization of dicarboxylic acid and diols Polymers formed by addition polymerization of propylene.
Process
Condensation polymerization Addition polymerization
monomers
Dicarboxylic acid and diols Propylene
Melting point
highest melting point lower melting point
hydrophobic ability
absorb water repels water
UV absorption
UV resistant. Less UV resistant
Durability
Polyesters are stronger and more durable Polypropylene is less durable than polyester
cost
Expensive due to the materials used in its production. Widely available and costs much less than polyesters.
Idea
They are commonly found as aliphatic polymers, semi-aromatic polymers, and aromatic polymers. They are commonly found only as aliphatic polymers.
What is polyester?

Polyesters are the polymers formed by the polymerization of dicarboxylic acid and diols. The procedure involved in its polymerization is known as condensation polymerization. . Polymers of diols and dicarboxylic acids are used in the manufacture of polyester. The polyesters are composed of at least 85% by weight of ester, dihydric alcohol and terephthalic acid. The chemical reaction between alcohols and carboxylic acid also results in the formation of polyesters other than esters. Polyesters find commercial uses due to their important properties, such as high durability, water-resistant nature, and quick-drying ability. These properties allow its use in the manufacture of fibers, films and packaging material, etc. Polyesters can withstand higher temperatures as they have a higher melting point. Polyesters are much more durable and stronger. Additional coatings such as “vinyl” are added for optimal strength. Polyesters are more resistant to ultraviolet rays. Polyesters can be expensive to produce compared to their other alternatives on the market. The occurrence of polyesters is present as semi-aromatic polymers, aliphatic polymers and aromatic polymers. Polyesters are combined with vinyl layers which make it more resistant to abrasion and thus are used commercially for construction purposes. Polyesters are not mold resistant on their own. However, a vinyl siding can improve its resistance. aliphatic polymers and aromatic polymers. Polyesters are combined with vinyl layers which make it more resistant to abrasion and thus are used commercially for construction purposes. Polyesters are not mold resistant on their own. However, a vinyl siding can improve its resistance. aliphatic polymers and aromatic polymers. Polyesters are combined with vinyl layers which make it more resistant to abrasion and thus are used commercially for construction purposes. Polyesters are not mold resistant on their own. However, a vinyl siding can improve its resistance. Polyesters are not mold resistant on their own. However, a vinyl siding can improve its resistance. aliphatic polymers and aromatic polymers. Polyesters are combined with vinyl layers which make it more resistant to abrasion and thus are used commercially for construction purposes. Polyesters are not mold resistant on their own. However, a vinyl siding can improve its resistance. Polyesters are not mold resistant on their own. However, a vinyl siding can improve its resistance. aliphatic polymers and aromatic polymers. Polyesters are combined with vinyl layers which make it more resistant to abrasion and thus are used commercially for construction purposes. Polyesters are not mold resistant on their own. However, a vinyl siding can improve its resistance.

What is polypropylene?

Polypropylenes are polymers formed by the polymerization of propylene. The process involved in its polymerization is known as addition polymerization. Polypropylenes are polymers of propylene alone. These are also known as thermoplastic polymers. These polymers have applications for use in fibers and plastics. [CH(CH)3CH2]n is the common formula for polypropylene. They are mainly used for use as packaging material. Polypropylenes have a much lower melting point compared to polyesters. Therefore, polypropylene softens when heated and can then be easily re-molded into any shape as needed. Polypropylenes are considered highly hydrophobic since, unlike polyesters, they do not absorb water at all. due to its ability not to react with water or any chemical. Polypropylene dries much faster than polyesters, but because they have a much lower melting point, they are limited for wide use in conditions where temperatures are higher. However, they have a much lower heat transfer rate, which means it retains more heat than polyester, but can’t face direct sunlight as it breaks down and colors fade. Due to its simple production process, polypropylene is widely available and very cost-effective compared to its other alternatives. Unlike polyesters, polypropylene commonly occurs only as aliphatic polymers. polypropylene is widely available and very cost effective compared to its other alternatives. Unlike polyesters, polypropylene commonly occurs only as aliphatic polymers. polypropylene is widely available and very cost effective compared to its other alternatives. Unlike polyesters, polypropylene commonly occurs only as aliphatic polymers.

Key differences
  1. Polyesters are polymers of dicarboxylic acids and diols, while polypropylenes are polymers of propylene.
  2. Condensation polymerization is the process that results in the formation of polyester. However, addition polymerization is the process that results in the formation of polypropylenes.
  3. Polyesters have higher melting points as compared to polypropylene which melts at a much lower melting point and can be re-molded into required shapes.
  4. Polyesters are less hydrophobic and absorb some water. On the other hand, polypropylene does not react with water and is considered highly hydrophobic.
  5. Polyesters are more resistant to UV rays, but polypropylenes are less resistant and prone to direct sunlight.
  6. Polyesters have a higher heat transfer rate compared to polypropylene.
  7. Polyesters are considered expensive due to the materials used in their production. However, polypropylenes are widely available and less expensive.
  8. Occurrence of polyesters is present as semi-aromatic polymers, aliphatic polymers and aromatic polymers. On the other hand, polypropylenes are only found as aliphatic polymers.

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