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Synthesis kev Polyimide

Polyimide yog li tetracid Dianhydride thiab diamine polymerization, tus synthesis loj ib kauj ruam method、two kauj ruam method、three kauj ruam txujci thiab roj theem nag lossis daus txoj kev.

(1) Txoj kev ib kauj ruam. Ib kauj ruam yog Dianhydride thiab diamine ncaj qha polymerized polyimide hauv kub taw tes siab hnyav, Monomer tsis yog polyamic kua qaub Direct synthesis ntawm poly imide. Qhov tshuaj tiv thaiv mob ntawm hom no muaj ntsis ntau ntau dua cov kev kho mob kub, lub ntsiab yog kom xaiv tus haum hnyav. Raws li qhov tus kwv tij molecular pawg ntawm polymer si, yuav tsum txhob tshem ya raws. Feem ntau cov dej tawm azeotropic generated, dej los yog cov polyamic acid ntsev nrog isocyanate ua diamine thiab generated kub thiab siab siab polymerization.the tiv thaiv kev ntawm hom no tseem tau mus ua perfected, thiab tus phaum nqis rau pem hauv ntej.

(2) Txoj kev ob kauj ruam. Ob kauj ruam yog ib lub Dianhydride thiab diamine tau polyamic acid precursor, ces yog cua sov los yog tshuaj, kev Intramolecular cyclodehydration polyimide taus. Tshuaj imidization txoj kev, cov dehydrating no polyamide acid, Polyimide generated cyclization tshuaj muaj coob leej ntau tus imides. Cov npaj polyimide thiab polyimide npaj txoj kev cua kub, thiab zog yog txawv, tshwj xeeb tshaj yog cov isoimide rings twb tsis thermal stability thiab muaj tshuaj reactivity. tus neeg saib xyuas lub cev qhuav dej txawv, txawv cyclization khoom imine / piv isoimide, yuav tsum xav txog li tautomeric tsis ruaj tsis khov heev los. Txheej txheem ob kauj ruam yog mature, tab sis muab kua qaub polyamic yuav tsis ruaj khov, nws tseem heev rhiab rau ya raws, decomposition no tshwm sim thaum cia, ces nyob acid alkyl ester txujci, polyamide silyl kua qaub ester txoj kev txhim kho txoj kev polyamic. Lwm precursor uas polyimide polyamide ester, yog ib tug polymer kuj ruaj khov, tau los tov rau daim ntawv cia mus sij hawm ntev. Muaj tus txheeb ze molecular pawg ntawm polyamide ester yog feem ntau li ntawm diacid uas muaj ntxhiab diester ua chloride, kua polycondensation los hws polymerization yog npaj rau cov diamine uas muaj ntxhiab. Polyamide ester kub heev los yog imidized polyimide tshwm sim Event catalyzed ntawm organic bases, tab sis tus me molecular compound so quav dej caw los yog alpha olefin es dej. Soluble polyamide ester intermediates nyob rau hauv cov polyamic acid, soluble sim organic kuab tshuaj uas tsis kub point, xws li dichloromethane, plaub pa furan, thiab yuav muab tau dej kub concentration, thiab yuav raug hloov raws li cov ester qauv ua polyamide ester uas muaj zog sib txawv, yuav siv tau thiab npaj siab zog thiab cov khoom kub modulus, yog ib txoj kev raug rau cov synthesis of polyimide. Tab sis cov imidization cov tshuaj tiv thaiv kev ua thiab cov uas tsis muaj, txoj kev, siab manufacturing nqi, ntxiv optimization.

Txoj kev peb kauj ruam. Txoj kev nqis rau peb yog polyisoimide tau txoj kev polyimide ntawm. Polyisoimide ruaj qauv, ua cov thawj polyimide matrix, vim kev kho cua sov tsis emit dej thiab lwm yam uas tsis muaj molecular yam, heterogeneous tau yooj yim mus rau imide, thiab yuav ua rau kev kawm yav tom ntej ntawm polyimide. Polyisoimide yog li ntawm polyamide kua qaub rau tus neeg saib xyuas lub cev qhuav, lub cev qhuav thiab cyclization thiab rau, ces mam muab rau lub luag hauj lwm ntawm acid los sis alkali isomerization catalysts xws li polyimide, isomerization Event tau yooj yim ntawm ib tug kub. Polyisoimide