Onye mmalite ọkụ

Onye mmalite ọkụ

N'ime usoro a na-ahụ maka foto, gụnyere UV gluu, mkpuchi UV, ink UV, wdg, mgbanwe kemịkalụ na-eme mgbe ọ natachara ma ọ bụ na-etinye ike dị n'èzí, na-emebi n'ime radicals free ma ọ bụ cations, si otú a na-akpalite mmeghachi omume polymerization.

Photoinitiators bụ ihe ndị nwere ike ịmepụta radicals n'efu ma malite ịmalite polymerization site na ọkụ.Mgbe ụfọdụ monomers na-enwu, ha na-amịkọrọ foton wee mepụta ọnọdụ obi ụtọ M* : M+ HV →M*;

Mgbe homolysis nke molekul na-arụ ọrụ, a na-emepụta radical free M * → R·+ R '·, mgbe ahụ, a na-amalite monomer polymerization iji mepụta polymer.

Nkà na ụzụ na-agwọ ọrịa radieshon bụ nkà na ụzụ nchekwa ike ọhụrụ na nchekwa gburugburu ebe obibi, nke ọkụ ọkụ ultraviolet (UV), electron beam (EB), ìhè infrared, ìhè a na-ahụ anya, laser, kemịkalụ fluorescence, wdg, na-ezute "5E" n'ụzọ zuru ezu. njirimara: Ọ dị mma, na-enye ike, akụ na ụba, nchekwa ike, na enyi gburugburu ebe obibi. Ya mere, a maara ya dị ka "Green Technology".

Photoinitiator bụ otu n'ime ihe ndị dị mkpa nke nrapado foto nwere ike ịgwọ, nke na-arụ ọrụ dị mkpa n'ịgwọ ọnụ ọgụgụ.

Mgbe photoinitiator na-amụba site na ultraviolet ìhè, ọ na-amịkọrọ ike nke ìhè na kewaa abụọ na-arụ ọrụ free radicals, nke na-amalite na yinye polymerization nke photosensitive resin na-arụ ọrụ diluent, na-eme ka nrapado cross-njikọ na siri ike. Onye fotoinitiator nwere njirimara nke ngwa ngwa, nchebe gburugburu ebe obibi na nchekwa ike.

Ụmụ irighiri ihe mmalite nwere ike ịmịnye ọkụ na mpaghara ultraviolet (250 ~ 400 nm) ma ọ bụ mpaghara a na-ahụ anya (400 ~ 800 nm). Mgbe ha nwetasịrị ike ọkụ ozugbo ma ọ bụ na-apụtaghị ìhè, ụmụ irighiri ihe na-amalite na-esi na steeti ala gaa na steeti singlet nwere obi ụtọ, wee banye steeti atọ nwere obi ụtọ site na mgbanwe n'etiti sistemụ.

Mgbe steeti singlet ma ọ bụ atọ nwere obi ụtọ site na mmeghachi omume kemịkalụ monomolecular ma ọ bụ bimolecular, iberibe arụ ọrụ nke nwere ike ịmalite monomer polymerization nwere ike ịbụ radicals efu, cations, anions, wdg.

Dị ka usoro mmalite dị iche iche si dị, ndị na-ese foto nwere ike kewaa n'ime radical polymerization photoinitiator na cationic photoinitiator, n'ime nke a na-ejikarị eme ihe n'ọtụtụ ebe.