polyamide
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.
Noun
-
a polymer containing repeated amide groups
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