Wood fibers-poly(vinyl chloride) (WF-PVC) composite and pure poly(vinyl chloride) samples, prepared by extrusion, were exposed to short wavelength UV-irradiation (λ = 253.7 nm). Scanning Electron Microscopy (SEM) micrographs shows heterogeneity of WF-PVC composite but the effect of UV-irradiation on surface morphology of sample is negligible. The course of photochemical reactions occurring in samples studied has been monitored by attenuated total reflection Fourier transform infrared (ATR-FTIR) spectroscopy. The results obtained indicate the better photochemical stability of WF-PVC comparing to virgin PVC.

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For vulcanization of fully saturated elastomers peroxide/coagent systems are commonly applied. Problems encountered with peroxides however, are reduced efficiency, especially in the presence of plasticizing oils, and unwanted side reactions. In this paper diazides are presented as alternatives to peroxide vulcanization systems, particularly in combination with the use of plasticizing oils. The performance of three diazides; tri(ethylene glycol)-di(azidoformate) (GDAF), 4,4′-isopropylidenediphenyl azidoformate (4,4′DAF) and 1,3-benzenedisulfonyl azide (1,3BDSA) is investigated. For the evaluation of the practical product performance, carbon black filled and oil extended compounds of EPM and EPDM-rubbers are used. It is also investigated how the presence of carbon black and plasticizing oil influences the diazide reaction kinetics.

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