The source is not mentioned.
The passage can also be found in , a source from 2003 (PDF file properties), which, however, is difficult to cite.
Note that the title of the chapter at the beginning of the page comes with the references "[245-248]", which however do not indicate that parts of the chapter are taken verbatim from somewhere else.
 Collins, Edward A., Experiments in polymer science, Wiley, c 1973
 Billmeyer, Fred W., Textbook of polymer science,- 3. Ed, Wiley, 1984
 Harry. R. Allcock, F.W. Lampe, Contemporary Polymer Chemistry, Prentice-Hall 1981
 Kulicke, Werner-Michael. , Analysis of polymers : molar mass and molar mass
distribution of polymers, polyelectrolytes and latices;, Basel : Hüthig & Wepf, 1992
- (SleepyHollow02), (Hindemith), WiseWoman