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Polymer molecular weight affects properties: higher MW = stronger, higher Tg, lower solubility; calculated from monomers and chain length.
Formel
Calculate M_w = n × M_monomer - (n-1) × 18 (water loss)
Trinn-for-trinn guide
- 1Input monomer molar mass and degree of polymerization (n)
- 2Calculate M_w = n × M_monomer - (n-1) × 18 (water loss)
- 3Show distribution effects
Løste eksempler
Inndata
Polyethylene: C₂H₄ unit, n=1000
Resultat
M_w ≈ 28,000 g/mol (number average MW)
Vanlige feil å unngå
- ✕Forgetting water loss in condensation polymerization
- ✕Confusing number-average vs. weight-average MW
Ofte stilte spørsmål
Why is molecular weight distribution important?
Broad distribution: poor flow processing, brittle; narrow: processable, stronger.
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