Crystallinity electron beam irradiation

Figure 10.12 (a) HRTEM images of YBa2Cu307 6, viewed down the [110] direction. The initial image showing a thin layer of disordered coating, and the image recorded from the same area after electron beam irradiation for 3h. The disordered layer recrystallized into a clean crystalline surface. 

Steller, R., Zuchowska, D., Meissner, W., Paukszta, D., Garbarczyk, J., Crystalline structure of polypropylene in blends with thermoplastic elastomers after electron beam irradiation. Radiation Physics and Chemistry 2006, 75, 259-267. 

PSt and PMMA formed by electron beam irradiation have no effect on the crystallinity of cellulose insofar as the blackness in the X-ray diffraction patterns of both WPC (irradiation) systems taken at room temperature are concerned. However, the high temperature feature of the E,p pattern of the PSt-WPC (irradiation) system indicates the enhancement of band (c) at ca. 190°C and the lowering of bands (a) and (b) (Figure 9). Therefore, it seems likely that grafted PSt somewhat perturbs the crystallites and increases the amorphous portion in wood by thermal shear at high temperatures. 

Electron beam-irradiated crosslinking has been studied in acetylene-impregnated PCT and other related polyesters (120). It was observed that crosslinking increased with the time of irradiation, accompanied by a decrease of crystallinity and an increase of T. Additionally it was evidenced an improvement in the mechanical behavior with an increase in the modulus at higher temperatures. 

El-Naggar et al. [84] have studied the effect of electron-beam irradiation on the thermal and mechanical properties of PPS. The dose rate was 50Mrads/sec and the maximum dose was 4000Mrads. They observed a decrease in crystallinity of PPS with increasing dose. Also, it was observed that the effect was more pronounced for the initially amorphous PPS than initially semicrystalline PPS, suggesting a lower radiation resistance of the amorphous phase. 

Mis] Misawa, M., Tanaka, Y., Nagai, H., Tsujimura, A., Spin-Echo NMR Study of Co-Hyperfine Field Distributions in Amorphous (C,T)-B Alloys (T = Fe, Ni, Mn) , J. Non-Crystalline Solids, 117/118, 344—346 (1990) (Magn. Prop., Experimental, 6) [1990Ste] Stergioudis, G.A., Polychroniadis, E.K., Induced Crystallization in Fe-Co-B Amorphous Alloys by Heat-Treatment and Electron-Beam Irradiation , Mater. Res. Bull, 25(10) 1287-1290 (1990) (Experimental, 15)... 

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