nkhani

wojambula zithunzi

Photoinitiator, yomwe imadziwikanso kuti photosensitizer kapena photocuring agent, ndi mtundu wazinthu zopangira zomwe zimatha kuyamwa mphamvu za kutalika kwa mawonekedwe amtundu wa ultraviolet (250 ~ 420nm) kapena dera lowoneka (400 ~ 800nm) ndikupanga ma radicals aulere ndi ma cation.
Kuyambitsa monomer polymerization wa cross-zolumikizana anachiritsa mankhwala.

Molekyu yoyambitsa imakhala ndi mphamvu yoyamwa m'dera la ultraviolet (250-400 nm) kapena dera lowoneka (400-800 nm).Pambuyo kuyamwa mphamvu ya kuwala mwachindunji kapena mosalunjika, molekyu woyambitsayo amasintha kuchokera pansi kupita ku dziko losangalala la singlet, ndiyeno amalumphira ku dziko losangalatsa la katatu kupyolera mu intersystem.
Pambuyo pochita chidwi cha singlet kapena triplet states kukumana ndi ma monomolecular kapena bimolecular chemical reaction, zidutswa zogwira ntchito zomwe zingayambitse polymerization ya monomers zimapangidwa, ndipo zidutswa zogwira ntchitozi zimatha kukhala ma radicals aulere, ma cations, anions, ndi zina zotero.
Malinga ndi njira zosiyanasiyana zoyambira, ma photoinitiators amatha kugawidwa kukhala ma free radical polymerization photoinitiators ndi cationic photoinitiators, omwe mwa omwe ma free radical polymerization photoinitiators ndi omwe amagwiritsidwa ntchito kwambiri.