3,3′,4,4′-Biphenyltetracarboxylic dianhydride CAS 2420-87-3
3,3 ', 4,4' - Biphenyltetracarboxylic dianhydride ndi chinthu chofunikira cha polyimide monomer chomwe chimagwiritsidwa ntchito kwambiri popanga zinthu za polyimide zomwe sizitentha kwambiri. Chimagwiritsidwa ntchito popanga zinthu za polyimide ndi zinthu zake zophatikizika, komanso mankhwala ophatikizika.
CAS 2420-87-3 ya 3,3', 4,4'-Biphenyltetracarboxylic dianhydride ndi kapangidwe kake kapadera komanso mankhwala abwino kwambiri a aromatic dianhydride, komanso ndi monomer yofunikira popanga zinthu za polima zogwira ntchito kwambiri. Ili ndi malo osasinthika ogwiritsidwa ntchito m'magawo monga ndege, zambiri zamagetsi, ndi zida zapamwamba.
| Chinthu | Kufotokozera |
| Malo otentha | 614.9±48.0 °C (Yonenedweratu) |
| Kuchulukana | 1.625±0.06 g/cm3 (Yonenedweratu) |
| Malo osungunuka | 299-305 °C (lit.) |
| λmax | 300nm (yowala) |
| Chiyero | 99% |
| Malo osungiramo zinthu | Mpweya wopanda mpweya, Kutentha kwa chipinda |
3,3', 4,4'-Biphenyltetracarboxylic dianhydride (CAS 2420-87-3, chidule chake ndi BPDA) ndi monomer yofunikira popanga zinthu za polima zogwira ntchito bwino, ndipo ntchito zake zimayang'ana kwambiri pamunda wazinthu zapamwamba.
1. 3,3', 4,4'-Biphenyltetracarboxylic dianhydride imagwiritsidwa ntchito ngati zigawo za kapangidwe ka ndege zomwe sizitentha kwambiri (monga zigawo za m'deralo za zitseko za satellite) ndi zokutira zotetezera kutentha za zipinda za injini; Chigawo chosinthika cha antenna cha zida ndi gawo lotetezera kutentha kwambiri la chingwe.
2. BPDA ingagwiritsidwe ntchito m'mabwalo ophatikizidwa (ics): kukonzekera mafilimu oteteza pakati pa zigawo, kuchepetsa kusintha kwa mawonekedwe komwe kumachitika chifukwa cha kutentha kwa chip, ndikuwonjezera kukhazikika kwa chip. Imapangidwa kukhala zinthu zopangidwa ndi PI (monga ulusi wodzazidwa ndi kaboni ndi graphite), zomwe zimagwiritsidwa ntchito m'mabearing ndi seals pansi pa mikhalidwe yogwira ntchito yotentha kwambiri (monga kutseka zigawo za injini zamagalimoto ndi zida zamakemikolo), kusintha zinthu zachitsulo kuti zichepetse kuwonongeka ndi dzimbiri.
3. Kupatula polyimide, BPDA imathanso kuchitapo kanthu ndi ma monomers osiyanasiyana kuti ipange zinthu zina zogwira ntchito za polima, ndikukulitsa malire ake ogwiritsira ntchito.
Polyamideimide (PAI) yopangidwa: BPDA imagwira ntchito ndi diisocyanate kuti ipange PAI. Mtundu uwu wa zinthu umaphatikiza kukana kutentha kwambiri kwa PI ndi kukana mphamvu kwa polyamide, ndipo ungagwiritsidwe ntchito kukonzekera zida zapamwamba zapulasitiki.
Polyetherimide yopangidwa (PEI): Imakumana ndi ma diamine okhala ndi ma ether bond kuti ipange PEI. Kuthekera kwake kukonzedwa ndikwabwino kuposa kwa PI yachikhalidwe. Itha kupangidwa kukhala zipolopolo za zida zamagetsi ndi zolumikizira zotentha kwambiri kudzera mu jekeseni, poganizira mphamvu komanso kusavuta kukonzedwa.
4. Magulu a anhydride mu molekyulu ya BPDA amatha kuchita zinthu zotseguka ndi magulu a epoxy a epoxy resin ndipo amagwiritsidwa ntchito ngati mankhwala ochiritsira omwe amapirira kutentha kwambiri:
4,4'-Biphthalic Anhydride 2420-87-3 imagwiritsidwa ntchito makamaka pokonzekera "zipangizo zophatikizika za epoxy zosagwira kutentha kwambiri", monga kuchiritsa mizu ya masamba a wind turbine (omwe amafunika kupirira kukalamba kwa kutentha kwambiri kwa nthawi yayitali) ndi kuchiritsa kwa epoxy substrates za ma circuit board apamwamba, kuti awonjezere kukhazikika kwa kutentha (Tg ya zinthu zochiritsidwayo ikhoza kuwonjezeka kufika pa 180℃) ndi mphamvu yamakina ya zinthu za epoxy.
Kawirikawiri amanyamula mu 25kg/ng'oma, ndipo amathanso kupangidwa mwamakonda.
3,3', 4,4'-Biphenyltetracarboxylic dianhydride CAS 2420-87-3
3,3', 4,4'-Biphenyltetracarboxylic dianhydride CAS 2420-87-3
