Thermal
degradation of vinylidene chloride/vinyl chloride copolymers in the presence
of N-substituted maleimides |
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Authors: | B A Howell J Zhang |
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Institution: | (1) Center for Applications in Polymer Science, Central Michigan University, Mt. Pleasant, USA, 48859-0001, MI |
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Abstract: | As a consequence
of their excellent barrier properties vinyl chloride/vinylidene chloride copolymers
have long been prominent in the flexible packaging market. While these polymers
possess a number of superior characteristics, they tend to undergo thermally-
induced degradative dehydrochlorination at process temperatures. This degradation
must be controlled to permit processing of the polymers. Three series of N-substituted
maleimides (N-alkyl-, N-aralkyl, and N-aryl) have been synthesized, characterized
spectroscopically, and evaluated as potential stabilizers for a standard vinyl
chloride/vinylidene chloride (85 mass%) copolymer. As surface blends with
the polymer, these compounds are ineffective as stabilizers. However, significant
stabilization may be achieved by pretreatment of the polymer with N-substituted
maleimides. The most effective stabilization of the polymer is afforded by
N-aralkyl- or N-arylmaleimides, most notably, N-benzylmaleimide and N-p-methoxyphenylmaleimide. |
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Keywords: | N-substituted maleimides stabilization thermal processing thermogravimetry vinyl barrier polymers |
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