Question 06 (Textile Engineering & Fibre Science)
A good fibre forming polymer should NOT have
| (A) | Linear polymer chain |
| (B) | Branched polymeric chain |
| (C) | High DP |
| (D) | High inter-molecular interaction |
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Frequently Asked Questions | FAQs
What are 4 the main types of polymers?
There are four main types of polymers:
Addition polymers: These polymers are formed through a polymerization process where monomers, which are molecules with reactive double bonds or other functional groups, are added together to form a polymer chain. Examples of addition polymers include polyethylene, polypropylene, and polystyrene.
Condensation polymers: These polymers are formed through a polymerization process where monomers with two or more reactive functional groups, such as carboxyl and hydroxyl groups, react to form a polymer while eliminating a small molecule, typically water or methanol, as a byproduct. Examples of condensation polymers include polyesters, polyamides, and polyurethanes.
Copolymers: These polymers are formed by polymerizing two or more different types of monomers together, resulting in a polymer chain with different types of repeating units. Copolymers can have a wide range of properties depending on the composition and arrangement of the monomers. Examples of copolymers include styrene-butadiene rubber (SBR) and acrylonitrile-butadiene-styrene (ABS).
Natural polymers: These polymers are found in nature and are derived from biological sources. Examples of natural polymers include proteins, cellulose, and DNA.
These four types of polymers have different chemical structures and properties, which make them suitable for various applications in fields such as plastics, fibers, coatings, adhesives, and more.
The four main types of polymer structures are:
Linear polymers: In linear polymers, the polymer chains are unbranched and have a simple linear structure. The monomers are polymerized in a straight chain without branching or cross-linking. Examples of linear polymers include high-density polyethylene (HDPE), polyvinyl chloride (PVC), and polyethylene terephthalate (PET).
Branched polymers: Branched polymers have polymer chains that contain branches or side chains, which are shorter chains that are attached to the main polymer chain. These branches can affect the physical and mechanical properties of the polymer, such as its flexibility, crystallinity, and melt viscosity. Examples of branched polymers include low-density polyethylene (LDPE) and low-density polypropylene (LDPP).
Cross-linked polymers: Cross-linked polymers have polymer chains that are interconnected through covalent bonds, creating a three-dimensional network structure. This cross-linking makes the polymer insoluble and infusible, resulting in a rigid and highly stable material. Cross-linked polymers are commonly used in applications such as coatings, adhesives, and thermosetting plastics. Examples of cross-linked polymers include epoxy resins, polyurethanes, and vulcanized rubber.
Network polymers: Network polymers are similar to cross-linked polymers, as they also have a three-dimensional network structure. However, network polymers typically have a higher degree of cross-linking, resulting in a more rigid and brittle material. Network polymers are used in specialized applications, such as in dental materials and certain types of composites.
These four types of polymer structures have different properties and characteristics, which make them suitable for a wide range of applications in various industries, including automotive, aerospace, packaging, electronics, and more.