ISSN:
0021-8995
Schlagwort(e):
Chemistry
;
Polymer and Materials Science
Quelle:
Wiley InterScience Backfile Collection 1832-2000
Thema:
Chemie und Pharmazie
,
Maschinenbau
,
Physik
Notizen:
Tribenzylamine moieties copolymerized into poly(ethylene terephthalate) (PET) are selectively cleaved by mild hypochlorous acid oxidation to give dibenzylamines plus aldehyde and/or carboxyl groups. When either 3,3′-dicarboxytribenzylamine (DCTBA) or 4,4′-DCTBA were used, molecular weight was reduced, consistent with a mechanism where only two of the three carbon-nitrogen bonds which cleave can give polyester backbone scission. When copolymerized 3,5 DCTBA was cleaved, no chain scission resulted, but about one-third of the nitrogen content was lost, again consistent with the random statistical oxidative attack at each of the three carbon-nitrogen bonds. Borane ester, B[(CH2)10CO2Me]3, copolymerized into PET, lost molecular weight progressively after melt spinning, drawing, and boil off of the resulting fibers. Chain scission resulted from rapid oxidation of borane bonds to borate esters followed by hydrolytic cleavage to boric acid and/or intermediate boronic acids.
Zusätzliches Material:
3 Tab.
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1002/app.1981.070260417
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