Cross-linking effect radiation technique

The effects of these parameters and cross-linking in polymer cable insulations, aged in radiation and thermal enviromnents, were investigated. The results were then used to recommend standards for an OIT methodology suited for practical use, including the nuclear power industiy. Techniques to estimate error in (O.l.T.) thermograms interpretation and reproducibility were also developed (Mason and Reynolds 1997). 

Finally, the effects of radiation cross-linking on the chain dynamics have been examined by Schilling and co-workers (206) using solid-state NMR techniques. 

A final technique that has been utilized to chemically remove residual styrene in PS is radiation treatment. Both beta (e-beam) and gamma radiation have been tried. E-beam appears to be the most effective form of radiation and is most suitable for continuous use (319,320). The e-beam ruptures C—H bonds, resulting in the formation of PS radicals. These radicals are very reactive and scavenge unreacted monomer. However, if no styrene is in the vicinity of the PS radical, it can do other things such as couple with another PS radical or react with oxygen. Currently, electron beam treatment of polymers is used commercially for elastomer cross-linking (wire/cable coatings) but not for monomer reduction. 

After implantation as dural substitute, collagen gradually degrades and cells synthesize their own dura mater. The non-degradable PET mesh remains in organism as unnecessary ballast. It is very important that collagen biomaterials can be effectively cross-linked and simultaneously sterilized by radiation technique, which does not produce toxic by-products detrimental to wound healing. 

Gamma radiation from a Co source has also been used by Schomburg et al. (43), Bertsch et al. (94), and Hubball and co-workers (95-97) as an effective technique for cross-linking polysiloxanes. In a comparative study of gamma... 

Ultraviolet Radiation Exposure - In adhesive bonding, a surface preparation technique in which the substrate is irradiated with high intensity UV light. Exposure to UV radiation results in chain scissions, cross-linking, and oxidation of the polymer surface. The effectiveness of this technique is dependent on the wavelength of radiation used. It is commonly used for polyolefins. Also called UV exposure. 

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