ISSN:
0449-2951
Schlagwort(e):
Chemistry
;
Polymer and Materials Science
Quelle:
Wiley InterScience Backfile Collection 1832-2000
Thema:
Chemie und Pharmazie
,
Physik
Notizen:
Although dichloroacetaldehyde has only one chlorine less than chloral, the polymerization and polymer characteristics are quite different. Dichloroacetaldehyde is readily polymerized by Lewis acid catalysts to polymer with terminal hydroxyl groups. The catalyst BF3·Et2O, at 0°C., produces very high molecular weight polymer, in bulk polymerization. A DPn of about 400 is readily attainable. The characteristics of the polymerization indicate a cationic type, with greater dependence of DP upon chain termination rather than chain transfer. The polymer is readily end-capped by acetic anhydride, with a pyridine catalyst, to increase its thermal stability. Melting point, infrared spectra, and x-ray diffraction measurements confirm that the polymer produced under these conditions is amorphous. Cast films of the polymer could be only partially oriented The polymer is soluble in many common organic solvents.
Zusätzliches Material:
8 Ill.
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1002/pol.1965.100031106
