learn.howToCalculate
learn.whatIsHeading
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)
Trin-for-trin 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
Input
Polyethylene: C₂H₄ unit, n=1000
Resultat
M_w ≈ 28,000 g/mol (number average MW)
Almindelige fejl at undgå
- ✕Forgetting water loss in condensation polymerization
- ✕Confusing number-average vs. weight-average MW
Ofte stillede spørgsmål
Why is molecular weight distribution important?
Broad distribution: poor flow processing, brittle; narrow: processable, stronger.
Klar til at beregne? Prøv den gratis Polymer M W-beregner
Prøv det selv →