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Published byLogan Quinn Modified over 9 years ago
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TechniquesGives useful information on IR and Fourier transform IR (FT IR) spectroscopy ATR (attenuated total reflectance )- IR spectroscopy Measurement of carbonyl absorption to determine photooxidation; determination of induction period, assesment of the effectiveness and buildup of hydroperoxides, chmeical composition of degradation products Diseappearance of bands at 3400 and 1700 Cm -1, new bands at 2100 and 1640 cm -1 Translation into Chemistry: -NH-CO- bonds are converted to –NH-CO-NH and –N=C=N-
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Carbonyl Index-Impact strength Carbonyl group can be readily monitored by IR Spec. (1710-35 cm -1 )
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UV spectroscopy Weathering effects on plastics in the form of chemical changes, discoloration, and darkening.
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ESCA (electron spectroscopy for chemical analysis)
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ESR (electron spin resonance spectroscopy) Formation and rate growth of free radicals NMR (nuclear magnetic resonance) Measurement of degradation induced changes in functional groups
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Gas Chromatography-mass spectrometry(GC-MS) Separation and identification of volatile degradation products in trace amount
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DTA (differential thermal analysis) and DSC (differential scanning calorimetry) Measurement of oxidation induction times to study a stabilizer’s effectiveness and its diffusion within the solid
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Thermal behavior of polymers give useful information for the mechanism of Polymer degradation
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