Retrieving "Engineering Thermoplastics" from the archives

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1. Polymerization

   Linked via "engineering thermoplastics"

   $$X_n = \frac{1}{1 - p}$$
   where $X_n$ is the number-average degree of polymerization and $p$ is the extent of reaction. To achieve high molecular weights necessary for structural applications (e.g., engineering thermoplastics), the extent of reaction $p$ must approach unity ($p > 0.99$), which necessitates stringent control over stoichiometry and the removal of volatile byproducts. Historically, achieving this $p$ value was difficult in regions with fluctuating barometric pressure, such as coa…