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—Josua Timotheus Oberlerchner, University of Natural Resources and Life Sciences Vienna-

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The Importance of Molecular Weight of Polymer

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Polydispersity characterises

the shape of the distribution

Gel Permeate Chormatography(GPC)

Nucleic Magenetic Resonance (NMR)

Gel Permeate Chormatography(GPC)

Static Light Scaterring (SLS)

Small Angel Scattering (SANS)

Osmometri ?

Intrinsic Viscosity ?

PREPARE

4

Modern way to determine Mn and Mw of Polymer

separates analytes on the basis of size

!

6

GPC Equipment

GPC

GPC

• GPC is based on the behaviour of polymer

molecules in solution

• In the solid state polymers can be considered

like spaghetti – a confusing mass of intertwined

chains

• In solution, polymer molecules are discrete

entities

• Due to entropic effects all but the most rigid of

polymer chains curls up in solution to form a ball

like shape

GPC

GPC

GPC

Polymer with high

molecular weight

will come out

earlier the the

smaller one

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SUMMARY OF GPC

separates analytes on the basis of size

1 2 3 4 5

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Based on GPC result we can determine when to add the second block

FACT

14 14

An osmometer is a device for measuring the osmotic strength of a solution, colloid,

or compound

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https://www.youtube.com/watch?v=F3ZKAzpFpB8

• Membran ini hanya melewatkan pelarut saja

sedangkan zat terlarut tidak dapat dilewatkan.

• Mula-mula tinggi larutan pelarut sama, setelah

dibiarkan beberapa saat osmosis terjadi ketika

pelarut pindah ke larutan melalui membran

semipermiabel.

• Sehingga tinggi larutan naik, tetapi pada suatu

saat kenaikan berhenti karena sistem mengalami

keseimbangan

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Polimer

Osmometeri

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Polimer

• R : 0,082 L atm/ mol K atau 8,314 J/ mol K;

• T adalah suhu dalam kelvins;

• C adalah konsentrasi dalam gram/ liter;

• ρ adalah densitas pelarut dalam gram/ cm3,

• g percepatan gravitasi 9,81 m/s2;

• Δh perbedaan ketinggian dalam tabung pengkuruan antara

larutan polimer dan pelarut dalam centimeter

• A2 koefisien virial kedua (ukuran interaksi antara larutan dan

polimer)

Osmometeri

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Polimer

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