Stability of vinylidene chloride copolymers containing 4-vinylpyridine units: Thermogravimetric assessment

B. Howell; Adeyinka Odelana

doi:10.1007/s10973-006-8367-7

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Journal of Thermal Analysis and Calorimetry

Volume/Issue:: Volume 89: Issue 2

Stability of vinylidene chloride copolymers containing 4-vinylpyridine units

Thermogravimetric assessment

Authors:

B. Howell

B. Howell Central Michigan University Center for Applications in Polymer Science Mt. Pleasant MI 48859-0001 USA

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Adeyinka Odelana

Adeyinka Odelana Central Michigan University Center for Applications in Polymer Science Mt. Pleasant MI 48859-0001 USA

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Pages:: 449–452

Online Publication Date:: 19 Jul 2007

Publication Date:: 01 Aug 2007

Article Category:: Research Article

DOI:: https://doi.org/10.1007/s10973-006-8367-7

Keywords:: plastic packaging; thermogravimetry; vinylidene chloride copolymers

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Abstract

Vinylidene chloride copolymers are prominent in the barrier plastic packaging industry. These materials display excellent barrier to the transport of oxygen (and other small molecules) as well as flavor and aroma molecules. However, they suffer from a propensity to undergo degradative dehydrochlorination at process temperatures. To scavenge hydrogen chloride formed and prevent its interaction with the metallic components of process equipment, a passive base is usually included as an additive prior to processing. The base is most often an inorganic oxide or salt. These may negatively impact the properties of the polymer, particularly as a film. An organic base that could be covalently incorporated into the copolymer might display better behavior. Accordingly, a series of copolymers containing low levels of 4-vinylpyridine (0.05–3 mole%) have been prepared, characterized, and examined by thermogravimetry to assess thermal stability. In all cases, polymers containing 4-vinylpyridine units are less stable than the polymer containing none of this comonomer. Clearly, the pyridine moiety is a sufficiently strong base to promote E2 elimination of hydrogen chloride to generate dichlormethylene units in the mainchain from which thermal degradation may be initiated.

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Journal of Thermal Analysis and Calorimetry

Print ISSN:: 1388-6150

Online ISSN:: 1572-8943

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Journal of Thermal Analysis and Calorimetry
Language	English
Size	A4
Year of Foundation	1969
Volumes per Year	1
Issues per Year	24
Founder	Akadémiai Kiadó
Founder's Address	H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
Publisher	Akadémiai Kiadó Springer Nature Switzerland AG
Publisher's Address	H-1117 Budapest, Hungary 1516 Budapest, PO Box 245. CH-6330 Cham, Switzerland Gewerbestrasse 11.
Responsible Publisher	Chief Executive Officer, Akadémiai Kiadó
ISSN	1388-6150 (Print)
ISSN	1588-2926 (Online)