Tsev > Xov xwm thiab paub > Ntsiab lus

Lwm nta PI (Polyimide)

Tus ceev txog PI 1.28-1.48g/cm3, nrog rau lub imidization kawm ntawv ua no, yuav kom ceev; Thaum twg uas muaj tej neeg nyob hauv cov saw hlau loj, ceev yuav tau me me thiab. PI lawm ntau dua compression tensile, dabtsi yog khoov, lub zog, txhua yam khoom rau nruab nrab thiab lub seb tug, tus modulus siab, tshwj xeeb tshaj yog thaum muaj modulus siab yog ib feature mas ntawm nws txhua yam khoom.

Txav resistant nplaum PI lawm yav tom ntej seem stability, yog kawg mas.

Feem ntau mas ntawv uas PI yog nws kub heev kuj yog kub, qhov kub decomposition ntawm cov iav qhov hloov kub, thermal kev kawm muaj siab tshaj, thiab tus nruam kub. Nruam kub ua hauj lwm yog 250 ℃.

PI Ted hluav taws xob rwb thaiv tsev zog, hauv ntau hom kub dipole tsis yog tsawg. Nws muaj cov corona kuj zoo tshaj plaws, los yog vim muaj ob hom tshuaj tiv thaiv kom neeg Corona tshuaj: oxidation yam pa atoms decomposition; oxidation Event ntawm nws, hydroxides yog resistant heev. PI belongs rau cov khoom siv dielectric intermediate.

PI muaj zoo stability rau roj, organic kuab tshuaj, nta kua qaub, tiam sis tsis tiv taus zog oxidation concentrated sulfuric acid thiab fuming nitric acid, kuj ntaus tsis alkali resistant thiab chav superheated. Oxidative degradation tshwm sim ntawm kev muaj zog oxidants. Alkali thiab dej vapor nyhuv yuav ua rau PI imide ntiv nplhaib qhib thiab qaum puas tshwm sim li, cov kev kawm degradation resulting.

Vim muaj coob tus uas muaj ntxhiab molecular saw rau PI nplhaib qauv uas absorbs tawg muaj peev xwm no muaj zog heev, yog li ntawd lawm kuj tawg yav tom ntej, nws yuav sawv hauv neutron, electron, 7 rays, ultraviolet tawg, tawg nyob, txoj kev dlha degradation no tsuas siv heev.