Studies on comb-like polymers: 5 A d.s.c. investigation of samples of poly(octadecylethylene) with different history

The crude product of the stereospecific polymerization of octadecylethylene shows, on d.s.c. analysis, two enthalpy changes associated with the melting or the crystallization of two immiscible crystalline phases. It is shown that the crystallization of the crude polymer from dilute heptane solutions...

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Bibliographic Details
Published in:Polymer (Guilford) 1982-01, Vol.23 (2), p.277-280
Main Authors: Lupinacci, Domenico, Andruzzi, Fulvio, Paci, Massimo, Magagnini, Pier Luigi
Format: Article
Language:English
Subjects:
calorimetry
crystallization
enthalpy changes
poly(octadecylethylene)
Polymerization
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Summary:The crude product of the stereospecific polymerization of octadecylethylene shows, on d.s.c. analysis, two enthalpy changes associated with the melting or the crystallization of two immiscible crystalline phases. It is shown that the crystallization of the crude polymer from dilute heptane solutions leads to a satisfactory separation of supposedly isotactic from atactic material. Contrary to previous statements, it is demonstrated that both these materials display single melting and crystallization phenomena. It is also shown that appropriate annealing treatments lead to a narrow distribution of the crystallite sizes for all the crystalline structured formed by poly(octadecylethylene).
ISSN:0032-3861
1873-2291
DOI:10.1016/0032-3861(82)90315-9