{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

Guide to equations

Guide to equations - p = extent of reaction = monomer unit...

This preview shows pages 1–2. Sign up to view the full content.

Properties of Molecules: Polymer Chemistry Mathematical Equations The following mathematical equations you are expected to remember! 1. Molecular weight averages a) Calculating number average and weight average molar mass distributions in terms of mole fractions n i i i i i M N M N = 2 w i i i i i i M N M N M = where N i is the number of moles of polymer with molar mass M i . b) Calculating number average and weight average molar mass distributions in terms of mass fractions 1 / n i i i M w M = w i i i M w M = where w i is the mass fraction of polymer with molar mass M i . c) Carothers Equation for calculating the number average degree of polymerisation and number average molar mass of step growth polymers Carothers Equation! = number average degree of polymerisation

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: p = extent of reaction = monomer unit mean molar mass 2. The relation between glass transition temperature and number average molecular weight g g n K T T M ∞ =-=-1 1 n x p n o n M M x = n x o M 3. Chain dimensions. a) The contour length of a polymer = nl b) The fully extended end-to-end distance of a polymer = nl cos (90 - θ /2) where n = number of backbone bonds of length l and θ = bond angle c) That for the freely jointed chain model, the root mean squared end-to-end distance is given by, Of course you will be expected to recognise and use other equations 1 2 2 1 2 f r n l =...
View Full Document

{[ snackBarMessage ]}

Page1 / 2

Guide to equations - p = extent of reaction = monomer unit...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document
Ask a homework question - tutors are online