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Questions and Answers
What is the primary purpose of the polycondensation step in polyester production?
What is the primary purpose of the polycondensation step in polyester production?
- To form polyethylene terephthalate (PET) directly
- To create a polymerized compound
- To react ethylene glycol and terephthalic acid (correct)
- To melt PET into fibers
What is a characteristic of acrylic fibers that makes them resistant to wrinkles?
What is a characteristic of acrylic fibers that makes them resistant to wrinkles?
- Crystalline structure (correct)
- High moisture absorption
- Good insulation properties
- Easy dyeability
What is a common application of nylon in the medical industry?
What is a common application of nylon in the medical industry?
- Medical tubing
- Surgical gloves
- Sutures (correct)
- Orthopedic implants
What is the primary raw material used in the production of rayon?
What is the primary raw material used in the production of rayon?
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What is the final step in the production of polyester fibers?
What is the final step in the production of polyester fibers?
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Study Notes
Polyester Production
- Raw Materials: Ethylene glycol and terephthalic acid
- Production Process:
- Polycondensation: Ethylene glycol and terephthalic acid react to form bis(2-hydroxyethyl) terephthalate
- Polymerization: The resulting compound is then polymerized to form polyethylene terephthalate (PET)
- Extrusion: PET is melted and formed into fibers
- Drawing: Fibers are stretched to align molecules and increase strength
- Annealing: Fibers are heat-treated to relieve stresses and set the fiber structure
Nylon Uses
- Textile Applications:
- Clothing (hosiery, sportswear, outdoor gear)
- Upholstery and carpets
- Industrial textiles (ropes, nets, and more)
- Industrial Applications:
- Automotive parts (gears, bearings, etc.)
- Sports equipment (fishing nets, ropes, etc.)
- Medical devices (sutures, implants, etc.)
- Specialized Uses:
- 3D printing
- Fishing lines and nets
- Musical instrument strings
Acrylic Fibers Properties
- Physical Properties:
- Soft, lightweight, and warm
- Good insulation and moisture-wicking properties
- Resistant to wrinkles and easy to care for
- Chemical Properties:
- Resistant to acids and alkalis
- Good resistance to sunlight and UV degradation
- Can be dyed easily
- Uses:
- Clothing (hats, sweaters, blankets)
- Home furnishings (throw blankets, pillows)
- Industrial applications (filtration, insulation)
Rayon Manufacturing Process
- Raw Materials: Wood pulp or cotton linters
- Production Process:
- Pulping: Wood chips or cotton linters are converted into a pulp
- Steeping: The pulp is steeped in a solvent (e.g., sodium hydroxide) to break down the lignin
- Pressing: The pulp is pressed to remove excess solvent
- Extrusion: The pulp is forced through a spinneret to form fibers
- Stretching and Annealing: Fibers are stretched and heat-treated to set the fiber structure
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Description
Learn about the production processes and properties of polyester, nylon, acrylic fibers, and rayon. Understand the raw materials, steps involved in manufacturing, and the various applications of these synthetic fibers.
