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- W2364490250 abstract "With benzophenone as photoinitiator,a two|step vapor|phase photografting of AA in LDPE film has been studied mechanically.The diffusion of BP into LDPE film has been carried out by dipping LDPE film into BP acetone solution for various periods of time and monitoring the concentrations in the film by measuring its absorption at 254nm on a 756|MC spectrophotometer.The diffusion coefficient,which decreased with the increasing of the concentration of BP,was between 0.8～2.0×10 -12 m+2·sec -1 .This monitoring method was also used in the study of the photoreduction of BP.The results showed that,when far UV( λ 300nm) was filtered,the photoreduction became slow down apparently ( τ 0.5 ～5 min),while τ 0.5 was about 1 min when it was irradiated by UV directly,and this tendency became more obvious when the oxygen was present.Like other photo reaction,the photoreduction has little dependence on the temperature,and it resulted in the crosslinking of LDPE film also,the percent of gel depended on radiating condition and amount of BP in LDPE film.The results of photografting under different conditions showed that the percent of graft ( G ) increased quickly at first,and then leveled up.While the far UV was filtered, G became lower at the beginning of the reaction than that while it was radiated by UV directly,but about 5 min later,there was little difference.Raising temperature could increase the percent of graft remarkably.Furthermore,the grafting system showed some living polymerization character:The graft yield increased continually even BP has been used up,which can be interpreted by the re|cleavage of the weak bond formed by LDPE chain and semipinacol radicals.Based on these facts,a monomer diffusion controlling principle,which was thought the main factor affecting the graft yield was discussed." @default.
- W2364490250 created "2016-06-24" @default.
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- W2364490250 date "2000-01-01" @default.
- W2364490250 modified "2023-09-27" @default.
- W2364490250 title "STUDY ON THE MECHANISM OF LDPE-AA VAPOR-PHASE PHOTOGRAFTING SYSTEM" @default.
- W2364490250 hasPublicationYear "2000" @default.
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