Hunhu uye zvikumbiro zvePolyimide (PI)

November 04, 2024

Polyimide (polyimide, akapfupikiswa sePi) anoreva kirasi yePolymers ane mhodzi yePolym. Yayo yakanyanya kupisa inopfuura mazana mana ° C, kwenguva refu kushandiswa kweiyo tembiricha-tembiricha-2 ° ° CE, chikamu chepamusoro, ~ 0.007, iri f to h kirasi insulation.

Hony mapurasitiki anogona kupa super tembiricha inodzivirira 350 ℃ uye pamusoro apa zvakateerana. Polyimide inogona kuumbwa ne molybdenum kukuvara, graphite, kabhoni fiber, polytetrafluoroylene, etc., iyo inogona kuchinja zvakanyanya simba rezvinyorwa uye kuzvishongedza zvinopfeka zvinopfekedza.

Polyimide pi ine yakakwira uye yakadzika tembiricha kuramba , non-ine muchetura, etcc. chikamu chehurefu hwekutonhora kweanopfuura 350 ℃, ipfupi-razvino mapuranga emapurasitiriya emapuranga ari nani, uye kuita kwayo kwakazara isina kugadzirwa nemamwe mainjiniya akakosha engineering mapurasitiki. Kuita kwayo kwakazara kunoenderana neyakajairika kune imwe yakakosha.

Polyimide's yakapfuma mhando yemhando huru ndeye homophthaal polyimide, ether anthydride polyimide, polyamide yakakura uye maleic Anhydride polyimide. Pakati pavo, maHomopolermer polyimide ndiyo mumiriri wePolycondons polyimide. Nekudaro, iko kusanzwisisika uye kufungidzira, uye kwakaoma kuita. Kazhinji inogona chete kushandisa poda metallurgy nzira nekuumbwa poda yakamanikidzwa zvigadzirwa zvepurasitiki, kana kushandiswa kwekunyengera kana kudzikisira nzira mune firimu. Semuenzaniso, girazi regirazi rakamisikidzwa nemhedzisiro yePolyamside mhinduro inopisa-yakamanikidzwa kugadzira mashitsi. Mukupesana, Monether Anhydride Type Type Polyimide seyakakurumbira polyimide, kuumba maitiro ekugadzirisa kwakawedzera zvakanyanya. Izvo hazvigone kungoumbwa nekuumbwa, asi kuburikidza nejekiseni, kuwedzera uye dzimwe nzira dzekuumbwa, dzinogona zvakare kuve dzakarongedzwa uye dzakatsiga nzira yekugadzira firimu.

Kuiswa

Polycendensation

Kudzokorora Type Anomatiki Polyimides anogadzirwa nekuita shanduko yezvinonhuwira neanonhuwira Sezvo iyo Synthesis yePolycondesied Polyimide inoitwa mune yakakwira boling point is prothyradidone, nezvimwewo, izvi zvepamhepo zvichikwira propot. Munguva yekugadzirira prepreg, uye kune vafambi vaburitswa panguva yekudyara kwemapolyamitides, iyo inogadzira zviri nyore pores mune zvigadzirwa zvemavara. Izvi zvinoita kuti zvive nyore kuburitsa madhiri mune zvigadzirwa zvemanyorero, uye zvakaoma kuwana zvigadzirwa zvemhando yepamusoro pasina pores. Naizvozvo, polycondensation polyimide yave isingashandiswe sematrix resin yezvinhu zvemhando, inonyanya kushandiswa kugadzira mafirimu efolyimi.

Polymerization

Sezvo polycondensation polyimide ine zvakashata zvinotaurwa pamusoro apa, kuti ndikunde zvikanganiso izvi, vakagadzira polymerization polyimizide. Iyo huru iyo yakave yakashandiswa zvakanyanya ndeye polybisaleimialimide uye nekabedye-yakavakirwa yekupedzisira-caped polyimides. Kazhinji idzi resins idzo dzakaderera manhukadzi misa mapoka polyimides ine mapoka asina kusimbiswa pamigumo, uyezve polymerized neisina kusimbiswa mapoka kana akashandiswa.

(1) Polybisaleimide

Polybisaleimideimi yakagadzirwa nePolycendenation yeMalic Anhydride uye Anoromatic Diamine. Izvo zvinofananidzwa ne polyimide, kuita hakuna kushata, asi maitiro eSynthesis iri nyore, nyore post-kugadzirisa, mutengo wakaderera, unogona kugadzirwa nyore nyore mune zvigadzirwa zvemhando dzakasiyana. Asi zvinhu zvakarapwa zvinonyanya kuputika.

Imwe yakakosha kirasi yePMR (yeInsitu Polymerization yeMonomer Reperants, Monomer Reperancal) Type Polyimide Resins Yakagadzirwa NaNasa Lewis Research Center. PMR-Type Polyimide resins yeAnotaticcarcarcarcarboxylic acitalkyl ester, 5-Norubentewene-2, 3-Dicarboxyllic acid monoalkyl esters. 3-Dicarboxyllic acid Menomers yakadai seAlkyl esters yeAlkyt tetracarcarcarcarcarcarcarcarcarcarboy of 5-Notherlicyl acid inonyungudutswa neAlkyl doro (semuenzaniso, methanol kana ethanol) kugadzira mhinduro inogona shandiswa zvakananga kuti zvibate machira.

Subclasses

Polyimides anogona kukamurwa kuita zvikamu zvina: homphenylene pi, solulle pi, polyamide-imeide (pai) uye polyetherimide (PEI).

Panyaya yekugadziridzwa, polyimide ine nzira dzakasiyana siyana. Kuburikidza nekuwedzera kwekushandurwa, girazi machira, boron machira, carbon fibers uye simbi masimbi anogona kuwedzerwa. Iyi yekusimbiswa inogona kudzora zvinobudirira kugadzirwa kwemutsara wekuwedzera kwebhandi, kugadzirisa simba rayo, uku uchideredza mari. Semuenzaniso, mukugadzirwa kwezvikamu zvine simba zvakakwirira, mushure mekuwedzera kweiyo yakagadziriswa polyimide inogona kutsungirira mitoro yakakura.

Filer kugadziridzwa, kune rumwe rutivi, inoshandisa maliganic filers, graphite, molybdenamu yekushambadzira, kana polytetrafluorollene sevhesi, iyo inovandudza mhedzisiro yayo yekuzvifunga uye inoderedza mitengo. Co-Mingling Goridhe zvakare yakakosha nzira yekuchinjika, polyimide inogona kuve yakavhenganiswa neye epoxy resins, polytethene, polytetrafluorolery kether, etc., kugadzira zvinhu zvine chekuita nekuita kwakanaka.

Kuita

1. Polyimide yakanyorwa naHomophthalal acid Dianhydride uye Phenylenteentiamine, iyo yekushomeka kweiyo tembiricha ye600

2, Polyimide anogona kutsungirira kupisa kwakanyanya, senge -269 ℃ mumvura yechielium hakuzoiti brittle.

3. uye biphenylene-mhando polyimide (Utilex s) inosvika 400mpa. kunge engineering mapurasitiki. Modulus yeElasticity inowanzoita 3-4gpa, iyo fiber inogona kusvika 200gov

4. Ndokunge, Alkaline Hydrolysis inogona kushandiswa kudzorera zvinhu zvakadzora, zvakadai saDianhydride naDianhydride uye diamin Chinja chimiro chinogona zvakare kupokana nehydrolysis mhando, dzakadai sekuramba 120 ℃, maawa mazana mashanu ekubira.

5, polyimide ine huwandu hwekushamwaridzana, marongero evakasiyana, mamwe marudzi anenge asinganzwisisike mumararamiro ese, akadai saTetrahbur.

6, kuenzanisa kwekuwedzera kwekuwedzera kwePolyimide mu2 7 / ℃.

7, polyimide ine yakanyanya kupokana neRiradiation, iyo firimu iri mu5 × 109rad nekukurumidza Electron Simba Rekuchengetwa kwe9%.

8, polyimide ine yakanaka dielectric nzvimbo, dielectric inogara ichiti ye3,4 kana zvakadaro, iyo sumo yeFluol, Difelectr kurasikirwa kwe10-3, Difectric Simba re 100-00kV / mm, vhoriyamu kuramba kwe 1017ር-cm. Izvi zvivakwa zvakakura kwazvo zvekupisa uye huwandu hwehuwandu hunogona kuchengetwa pakakwirira.

9, Polyimide ndeyekuzvidzivirira-yekuzvidza polymer, stopto stops rate.

10, Polyimide mune yakanyanya kucheka pasi peshoma shoma.

11, Polyimide asiri-ane chepfu, anogona kushandiswa kugadzira tafura uye zviridzwa zvekurapa, uye zvakaratira zviuru zvenguva stillilization. Vamwe polyimide ine zvakare yakanaka biooplication, semuenzaniso, muropa rekuenzanisa kweropa rekuti risingaziveke, muVitro Cytototoity bvunzo yeasina-muchetura.