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synthesis method Polyimide

qon polyimide tetracid dianhydride 'ej pa' polymerization 'elbogh wa' mIw method、two mIw method、three mIw method SIp phase precipitation method 'ej synthesis, diamine.

(1) method wa' mIw. method mIw wa' dianhydride 'ej Hoch wo' lang boiling jen solvent, Monomer not pong polyamic pey Direct synthesis poly imide polyimide polymerized diamine. reaction je method be'nI'puqDaj vI'Iprup moderate puS tuj treatment, ngaQHa'moHwI'mey solvent yuQmeyDaq wIv. Hoch ghur relative molecular MaQa' polymer, moisture teq Dajlaw'. motlh je bIQ azeotropic bIQ, generated, teq pagh mIw polyamic pey salt isocyanate diamine ngaSwI' yuvtlhe' wIngaQmoHta'DI' 'ej bopummeH jen Hat joH rop jen polymerization.the SeH mIw method 'ej generate 'ach jatlhQo'ghach practical 'ej forward.

(2) method cha' mIw. cha' mIw method dianhydride 'ej polyamic pey precursor, vaj pong tuj chemical methods, Intramolecular cyclodehydration polyimide Dumerbe' pagh Suq diamine. yIteb mI' pIm imides Sev chemical imidization method, dehydrate Duy polyamide pey, Polyimide generated chemical cyclization. qeq polyimide je polyimide qeq heating method physical 'ej chemical bang pIm, 'eS stability thermal jen reactivity chemical je Especially isoimide Qeb. pIm dehydration Duy pIm cyclization product imine, ghap isoimide ratio, laH luH 'angbogh je tautomeric highly unstable. cha' mIw mIw nen, 'ach polyamic pey taS 'oHbe' ngaDmoH, SoHvaD Hap moisture, during storage, qaS decomposition vaj nargh polyamic pey alkyl ester method, polyamide pey silyl ester method improvement method. latlh precursor polyimide polyamide ester, relatively ngaDmoH polymer, Sub pagh taS chenmoH nI'taHvIS storage. roD qon jen relative molecular MaQa' polyamide ester aromatic diacid diester acyl chloride, qaSmoHlu' taS polymerization polycondensation pagh condensation je aromatic diamine. qaStaHvIS polyamide ester tuj imidized pagh polyimide reaction pong organic waw' 'ach mach molecular compound DoH alcohol alpha pagh olefin qaq bIQ catalyzed. soluble polyamide ester intermediates neH polyamic pey, soluble ta' je common boiling lang, such as dichloromethane, loS yInSIp furan, 'eS laH, taS concentration jen, Suq 'ej laH polyamide ester je pIm bang choH pong ester tlham QutwI', 'ej laH lo' jen HoS jen modulus Hap 'u' 'ej qeq organic solvents typical method synthesis polyimide. 'ach optimization vISangchu'Qo'chugh je 'eS, Qatlh mIw, jen cost, manufacturing imidization reaction activity.

method wej mIw. method mIw wej polyimide method via Suq polyisoimide. tlham, ngaDmoH polyisoimide je wa'DIch polyimide matrix, mo' wej bIQ latlh 'eS molecular substances, Hergh heterogeneous vaj imide, 'ej tlhuD 'ej laH pov yIqaw polyimide tuj treatment. qon polyisoimide polyamide pey dehydration Duy, dehydration 'ej cyclization 'ej vaj je vaj pey alkali pagh isomerization catalysts such as polyimide isomerization reaction Hergh DeSDu' Hat jen, role. polyisoimide