labarai

mai daukar hoto

Photoinitiator, wanda kuma aka sani da photosensitizer ko photocuring wakili, wani nau'i ne na roba wakili wanda zai iya sha da makamashi na wani tsawo tsawo a cikin ultraviolet yankin (250 ~ 420nm) ko bayyane yankin (400 ~ 800nm) da kuma samar da free radicals da cations.
Don fara monomer polymerization na giciye-haɗe da warkewa mahadi.

Kwayoyin ƙaddamarwa yana da takamaiman ikon ɗaukar haske a cikin yankin ultraviolet (250-400 nm) ko yanki mai gani (400-800 nm).Bayan shayar da makamashin haske kai tsaye ko a kaikaice, kwayoyin halittar mai farawa suna canzawa daga yanayin kasa zuwa yanayin sha'awa na singlet, sannan kuma ya yi tsalle zuwa yanayin zumudi na uku ta hanyar intersystem.
Bayan jin daɗin jihohin singlet ko triplet sun sami halayen sinadarai na monomolecular ko bimolecular, ana samar da gutsutsutsu masu aiki waɗanda zasu iya fara polymerization na monomers, kuma waɗannan gutsuttsuran aiki na iya zama radicals kyauta, cations, anions, da sauransu.
Dangane da hanyoyin farawa daban-daban, ana iya raba masu ɗaukar hoto zuwa radical polymerization photoinitiators da cationic photoinitiators, daga cikinsu akwai mafi yawan amfani da radical polymerization photoinitiators.