While low molecular substances readily undergo dissolution.
Polymers take considerable to do so . If we add a low molecula...
Different stages of polymer dissolution
. . .
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
Solid polymer
added to sol...
THANK YOU
Polymer dissolution
of 4

Polymer dissolution

polymer dissolution - simple ppt!!
Published on: Mar 4, 2016
Published in: Engineering      
Source: www.slideshare.net


Transcripts - Polymer dissolution

  • 1. While low molecular substances readily undergo dissolution. Polymers take considerable to do so . If we add a low molecular weight substance like Nacl to water in a beaker and stir . It get ionized Na+,cl-,ions and they are uniformly dispersed in water. They are dissolved faster when agitated. If we add a polymer like solid PVA (poly vinyl alcohol)to water and stir nothing will happen for same time .Slowly the fragment swell and increase in size. Then only diffusion takes place. The polymer molecules are large compared to solvent molecules .They are not in discrete form but interpenetrated and tightly folded random coils forces like dispersion and hydrogen bonding hold the coils and segments together .Because of larger size coiled nature and strong possess solvent molecules take time to established interaction with the polymer molecule and dissolved them.
  • 2. Different stages of polymer dissolution . . . . . . . . . . . . . . . . . . . . . . . . . . . . Solid polymer added to solvent Swollen polymer In solvent Solvated polymer molecules Diffusing out of swollen mass
  • 3. THANK YOU

Related Documents