polyamide

Thân thiện

A scientist holds a sample of polyamide fiber in the laboratory.

Definition

Noun: A synthetic polymer characterized by long chains of repeating molecular units linked by amide bonds (-CO-NH-). Polyamides are a class of strong, durable materials, with nylon being the most well-known example.

Usage

Polyamide is a technical term used primarily in chemistry, materials science, and manufacturing. It refers to the material itself, not a specific product. - It functions as a countable noun when referring to types (e.g., various polyamides) and as an uncountable/mass noun when referring to the material in bulk (e.g., made from polyamide).

Examples

• As a countable noun (type):
  • Nylon 6,6 and Kevlar are both important polyamides.
  • The chemist synthesized a new polyamide with exceptional heat resistance.
• As an uncountable noun (material):
  • The gears are molded from high-strength polyamide.
  • This fabric is a blend of cotton and polyamide.

Advanced Usage

• Engineering Context: Polyamides are often specified by their properties, such as "aromatic polyamide" (e.g., Kevlar) for high strength or "aliphatic polyamide" (e.g., common nylon) for general use.
• "Polyamide resin": A common formulation used in plastics and fiber production.
  • The component was injection-molded from a polyamide resin.

Variants and Related Words

• Nylon (n): The most common and commercially significant type of aliphatic polyamide, used for fibers, fabrics, and plastics.
• Aramid (n): A shortened term for "aromatic polyamide," a class of synthetic fibers known for heat resistance and high strength (e.g., Kevlar, Nomex).
• Polymer (n): The broader category to which polyamides belong, encompassing all large molecules composed of repeating subunits.

Synonyms

• Nylon (specific, common type)
• Synthetic polymer (broader category)

Related Phrases / Compound Terms

• Polyamide fiber: Refers to the material in filament or thread form, used for textiles.
  • The rope is made from braided polyamide fiber.
• Polyamide plastic: Refers to the material in solid plastic form, used for mechanical parts.
  • The housing is made from a durable polyamide plastic.

Học thuật

Noun

1. a polymer containing repeated amide groups

Từ đồng nghĩa

• polymeric amide