Effect of damp-heat aging on the structures and properties of ethylene-vinyl acetate copolymers with different vinyl acetate contents

We reported herein the damp-heat aging of ethylene-vinyl acetate copolymers (EVA) with different vinyl acetate (VAc) contents simultaneously for weeks. The aging was carried out under temperature of 40°C and relative humidity of 93% in air atmosphere. The changes of copolymers' structures and p...

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Bibliographic Details
Published in:Journal of applied polymer science 2009-05, Vol.112 (4), p.2358-2365
Main Authors: Shi, Xu-Ming, Zhang, Jun, Li, Deng-Ru, Chen, Shuang-Jun
Format: Article
Language:English
Subjects:
Ageing
Applied sciences
crystallization
damp-heat aging
Exact sciences and technology
mechanical properties
Physical properties
Polymer industry, paints, wood
Properties and testing
structure
Technology of polymers
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Summary:We reported herein the damp-heat aging of ethylene-vinyl acetate copolymers (EVA) with different vinyl acetate (VAc) contents simultaneously for weeks. The aging was carried out under temperature of 40°C and relative humidity of 93% in air atmosphere. The changes of copolymers' structures and properties were investigated by means of FTIR, wide angle X-ray diffraction (WAXD) and differential scanning calorimetry (DSC) and mechanical tests. CI values derived from ATR-FTIR spectra have a decrease when aging time is 1 week and then increase during damp-heat aging process which suggests the first loss then incorporation of O==C group. WAXD infer that the narrowing trend of FWHM and increase of crystal sizes may attribute to the melting and re-crystallization of secondary crystallization, which is also confirmed by DSC results. Mechanical tests including Shore A and Shore D hardness, modulus at 100%, tensile strength and elongation at break, are all depending on the primary crystallization and influenced little by damp-heat aging.
ISSN:0021-8995
1097-4628
DOI:10.1002/app.29659