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Chemical ageing polymers

Chemical aging or chemical degradation is distinct from physical aging in that it involves often irreversible changes to the chemical structure of the polymer. Examples include oxidative crosslinking, de-polymerization, and UV-induced chain scission. These chemical changes can alter many of the physical and chemical properties of a polymeric material and again, often occur over extended timescales. [Pg.264]

A comprehensive analytical model for predicting long term durability of resins and of fibre reinforced plastics (FRP) taking into account viscoelastic/viscoplastic creep, hygrothermal effects and the effects of physical and chemical aging on polymer response has been presented. An analytical tool consisting of a specialized test-bed finite element code, NOVA-3D, was used for the solution of complex stress analysis problems, including interactions between non-linear material constitutive behavior and environmental effects. [Pg.366]

The chemical aging processes always involve a change in the composition or molecular structure of the polymer. These processes include ... [Pg.103]

Oxidations can lead to chain scission, to cross-linking, and/or to polymer discoloration. This undesirable chemical aging can be largely prevented by the addition of antioxidants. Hydrogen chloride is also often released from poly(vinyl chloride) for this reason, this polymer must also be stabilized by what are known as heat stabilizers. [Pg.637]

The effect of thermal and chemical aging on the mechanical properties of polymers including blends is of primary concern to assess the service lifetime and long-term... [Pg.1381]

V.K. Thakur, A.S. Singha, and M.K. Thakur, Green Composites from Natural Fibers Mechanical and Chemical Aging Properties. Int. J. Polym. Anal. Charact. 17, 401-407 (2012). [Pg.13]

Li, K., Wang, K., Zhan, M., Xu, W. The change of thermal-mechanical properties and chemical structure of ambient cured DGEBA/TEPA under accelerated thermo-oxidative aging. Polym. Degrad. Stab. 98, 2340-2346 (2013)... [Pg.96]

Key words chemical degradation, biochemical degradation, oxidative degradation, hydrolytic degradation, enzymatic degradation, calcification, accelerated ageing, polymer implants. [Pg.164]

See other pages where Chemical ageing polymers is mentioned: [Pg.76]    [Pg.349]    [Pg.125]    [Pg.133]    [Pg.28]    [Pg.434]    [Pg.462]    [Pg.126]    [Pg.126]    [Pg.265]    [Pg.79]    [Pg.244]    [Pg.253]    [Pg.313]    [Pg.139]    [Pg.411]    [Pg.483]    [Pg.978]    [Pg.17]    [Pg.573]    [Pg.162]    [Pg.358]    [Pg.349]    [Pg.357]    [Pg.404]    [Pg.160]    [Pg.63]    [Pg.630]    [Pg.158]    [Pg.11]    [Pg.843]    [Pg.1358]    [Pg.1358]    [Pg.212]    [Pg.215]    [Pg.159]    [Pg.29]    [Pg.2734]    [Pg.379]    [Pg.380]    [Pg.384]    [Pg.410]   


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