technologybriefs
9:51in productionCh. 1 · No Problem, Just Polymers/ 9:51 · ceiling 15 min
Tech history

Nylon

Wallace Carothers · 1935

A lab accident turned into a monopoly: nylon worked because it was predictable, not because it was needed.

Nylon 66 is the first commercially successful synthetic thermoplastic polymer. It was synthesised on February 28, 1935, by Gerard Berchet under Wallace Carothers’ direction at DuPont’s Experimental Station. It is formed by step-growth polymerization of hexamethylenediamine and adipic acid into polyamide 6-6. Its strength and elasticity were confirmed in the first sample, enabled by cold drawing. DuPont patented it in September 1938 and secured a monopoly—prompting Paul Schlack at IG Farben to develop nylon 6 from caprolactam in January 1938. The work began as fundamental research on linear super-polymers with no practical aim.

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Chapters & takeaways4
  1. 0:58
    No Problem, Just Polymers

    Nylon was not invented to replace silk—it emerged from eleven years of theory-first polymer research with no practical goal.

  2. 2:32
    How to Pull a Fibre from Melt

    It works because Carothers derived the mathematics of step-growth polymerization—and because filaments form when you pull a rod from molten polyamide.

  3. 4:15
    Strength Was Drawn, Not Mixed

    Elasticity and strength appeared in the first 1935 sample—but only after cold drawing aligned the chains.

  4. 5:49
    Monopoly Lasted Less Than a Year

    DuPont patented nylon 66 in September 1938—and IG Farben responded with nylon 6 just nine months later.

Worth your time?

Yes. Study the whole thing.

4.5/ 5
What works
  • predictable molecular growth via Carothers equation
  • repeatable filament formation through melt-drawing
  • commercial adoption as a silk substitute in hosiery
What does not
  • solve a pre-defined industrial problem
  • scale without proprietary equipment or process control
  • avoid rapid competitive replication
Study it if
  • polymer chemists
  • industrial historians
  • patent strategists
Skip it if
  • textile designers seeking open-source alternatives
  • sustainability engineers assessing feedstock origin
The written brief1 min read

What it is and the problem it solves

Nylon 66 is the first commercially successful synthetic thermoplastic polymer. It solves the problem of inconsistent, scarce, and seasonally variable natural fibres—by delivering uniform elasticity and strength from petrochemical feedstocks.

How it works

Nylon 66 is a condensation polymer formed by step-growth polymerization of hexamethylenediamine and adipic acid. Filaments are drawn from the molten polymer by dipping and withdrawing a rod. Carothers used Julian Hill’s cold drawing method to align polymer chains and develop strength.

What works

The polymer exhibits elasticity and strength. It forms continuous filaments via melt-drawing. Its step-growth mechanism is mathematically predictable via the Carothers equation, linking monomer conversion to polymer chain length.

What does not

It does not emerge from applied problem-solving. The research began as curiosity-driven work on linear super-polymers with no practical aim. Its commercial success was retrofitted onto fundamental theory—not engineered from market need.

What it changes

It changes textile manufacturing by replacing natural fibres with a reproducible, tunable synthetic. It establishes DuPont’s monopoly over synthetic fibres by September 1938—and triggers parallel development (nylon 6) at IG Farben within three years.

Is it worth your time

Yes—if you work in materials science, polymer engineering, or industrial history. It established the first commercially viable synthetic thermoplastic, but its commercial monopoly relied on DuPont’s patent control, not inherent scalability or low-cost synthesis.

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