Crystalline and relaxation properties of ethylene copolymer films inserted between two steel sheets
作者:
S. Bistac,
M.F. Vallat,
J. Schultz,
期刊:
Journal of Macromolecular Science, Part B
(Taylor Available online 1999)
卷期:
Volume 38,
issue 5-6
页码: 1037-1043
ISSN:0022-2348
年代: 1999
DOI:10.1080/00222349908248157
出版商: Taylor & Francis Group
关键词: Crystallinity;Glass relaxation;EVA copolymers;Interphase;Vis-coelastic properties.
数据来源: Taylor
摘要:
The relaxation and crystalline properties of ethylene vinyl acetate (EVA) co-polymers inserted in steel/polymer/steel assemblies were studied. To investigate the properties of the interfacial region, polymers of different thickness inserted in the assemblies were analyzed. The studied EVA copolymers are semicrystalline polymers. The relaxation properties of the amorphous phase were investigated by dynamic mechanical measurements performed on the steel/polymer/steel assemblies, and the crystalline properties were studied by differential scanning calorimetry (DSC). The results indicate that, for low polymer thicknesses, the mobility of the amorphous phase is significantly reduced. Significant changes in the crystalline organization also were observed when the polymer thickness decreased, with the presence of more numerous disorganized crystals for thin EVA layers. These crystals can act as physical ties that reduce the mobility of the neighboring amorphous chains. These results indicate the formation of an interphase layer of reduced mobility.
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