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The nature of the branches in poly(vinyl chloride)

✍ Scribed by Abbås, Kent B. ;Bovey, Frank A. ;Schilling, Frederic C.


Publisher
Wiley (John Wiley & Sons)
Year
1975
Weight
364 KB
Volume
1
Category
Article
ISSN
0025-116X

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✦ Synopsis


The presence of branches in poly(viny1 chloride) as indicated by previous IR measurements on the polymer reduced to polyethylene by means of lithium aluminum hydridc is believed to affect materially the morphology and solid state properties of poly(viny1 chloride); however, up to the present, the nature of these branchcs has not been known. By usc of I3C-NMR on reduced poly(viny1 chloride) it is demonstrated that the branches are methyl groups, prcsumably corresponding to chloromcthyl groups in the original polymer. In the sample studied. the frequency is ca. 3 methyl groups pcr lo00 CH2 groups. but this is -expected to depend on the temperature of polymcrization. Thcre is also some evidence for long branches, probably not cxceeding 1 per loo0 C H 2 groups.

ZUSAM M ENFASSUNG :

IR-spektroskopische Untersuchungen von Polyiithylen-Proben. dargcstellt durch Reduktion von Polyvinylchlorid mit Lithiumaluminiumhydrid, IicUcn darauf schlieBen, dal3 Polyvinylchlorid Seitenketten cnthllt, dic seine Morphologie und Festkiirpercigenschaften wesentlich beeinflussen. Die Natur dicser Seitenkettcn war bisher unbekannt. Es wird anhand von "C-NMR Spektren gezcigt. dal3 die Verzweigungen in reduziertem Polyvinylchlorid BUS Methylgruppen bestchcn, die vermutlich aus Chlormethylgruppen des ursprunglichcn Polymeren entstanden sind. Die untersuchte Probe enthielt ca. 3 CH3-Gruppcn pro loo0 CH2-Gruppen. jcdoch ist dieses Verhaltnis vermutlich von dcr Polymcrisationstcmperatur abhlngig. Zusiitzlich wurden Anzeichen fur langue Seitenkcttcn gefundcn. die allerdings nur in einem Ausmal3 von weniger als 1 pro loo0 CH2-Gruppen vorhandcn scin durften.


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Long branching in poly(vinyl acetate) an
✍ Nozakura, Shun-Ichi ;Morishima, Yotaro ;Murahashi, Shunsuke 📂 Article 📅 1972 🏛 Wiley (John Wiley & Sons) 🌐 English ⚖ 555 KB

## Abstract It is a common view that poly(vinyl acetate) has many branches at the acetyl side group, but that the corresponding poly(vinyl alcohol) has little branching. In order to study the branching in poly(vinyl acetate) and poly(vinyl alcohol) which is formed by chain transfer to polymer, the