3,3′,4,4′-Biphenyltetracarboxylic dianhydride CAS 2420-87-3
3,3 ', 4,4' - He rauemi monomer polyimide nui te biphenyltetracarboxylic dianhydride, ā, he whānuitia ana ngā tono mō te hanga rauemi polyimide ātete-mahana teitei. Whakamahia mō te hanga hua polyimide me ā rātou rauemi hiato, arā, ngā takawaenga rongoā.
Ko te CAS 2420-87-3 o te 3,3',4,4'-Biphenyltetracarboxylic dianhydride he hanganga motuhake, he matū dianhydride kakara tino pai te mahi, ā, he monomer matua anō hoki mō te hanga rauemi polymer tino mahi. He tūranga tono nui tōna i roto i ngā mara pēnei i te rererangi, ngā mōhiohio hiko, me ngā taputapu matatau.
| Taonga | Whakatakotoranga |
| Te pūwāhi koropupū | 614.9±48.0 °C (I matapaetia) |
| Kiato | 1.625±0.06 g/cm3 (I matapaetia) |
| Te pūwāhi rewa | 299-305 °C (whakamārama) |
| λmaximum | 300nm (iritihia) |
| Te parakore | 99% |
| Ngā tikanga rokiroki | Āhua kore mahi, Pāmahana Rūma |
Ko te 3,3',4,4'-Biphenyltetracarboxylic dianhydride (CAS 2420-87-3, whakarāpopototia ko BPDA) he monomer matua mō te hanga rauemi polymer mahi-teitei, ā, ko ōna tono he tino arotahi ki te mara rauemi kounga-teitei.
1. Ka whakamahia te 3,3',4,4'-Biphenyltetracarboxylic dianhydride hei wāhanga hanganga ātete-mahana-tiketike mō ngā waka mokowhiti (pērā i ngā wāhanga ā-rohe o ngā anga amiorangi) me ngā paninga whakamarumaru mō ngā wāhanga miihini; Ko te papa pūihi ngāwari o ngā taputapu me te paparanga whakamarumaru taura ātete-mahana-tiketike.
2. Ka taea te whakamahi i te BPDA i roto i ngā ara iahiko whakauru (ics): hei whakarite i ngā kiriata ārai ā-paparanga, hei whakaiti i te whakarerekētanga āhuahanga i puta mai i te wera maramara, me te whakarei ake i te pumau o te maramara. Ka hangaia hei rauemi hiato PI (pēnei i te muka waro kua whakakīia me te karāpeti), e whakamahia ana i roto i ngā peera me ngā hiri i raro i ngā tikanga mahi pāmahana teitei (pēnei i te hiri i ngā wāhanga o ngā miihini motuka me ngā taputapu matū), hei whakakapi i ngā rauemi whakarewa hei whakaiti i te kakahu me te waikura.
3. Haunga te polyimide, ka taea hoki e te BPDA te tauhohe ki ngā monomers rerekē hei hanga i ētahi atu rauemi polymer mahi, ka whakawhānui ake i ōna rohe tono.
Polyamideimide Hanga (PAI): Ka tauhohe te BPDA ki te diisocyanate hei hanga PAI. Ka whakakotahi tēnei momo rauemi i te ātete pāmahana teitei o te PI me te ātete pānga o te polyamide, ā, ka taea te whakamahi hei hanga i ngā wāhanga kirihou hangarau kounga teitei.
Polyetherimide Hanga (PEI): Ka tauhohe ki ngā diamine kei roto ngā here ether hei hanga PEI. He pai ake tōna ngāwari ki te tukatuka i tērā o te PI tuku iho. Ka taea te hanga hei anga o ngā taputapu hiko me ngā hononga ātete pāmahana teitei mā te werohanga, me te whakaaro ki te kaha me te ngāwari ki te tukatuka.
4. Ka taea e ngā rōpū anhydride i roto i te ngota BPDA te whai i ngā tauhohenga whakatuwhera mowhiti me ngā rōpū epoxy o te kapia epoxy, ā, ka whakamahia hei kaihoko whakamaroke ātete pāmahana teitei:
Ko te 4,4'-Biphthalic Anhydride 2420-87-3 e whakamahia ana mō te whakarite i ngā "rauemi hiato epoxy ātete-mahana-tiketike", pērā i te whakamaroke pakiaka o ngā mata o te hau tāpoi (e hiahia ana kia tu atu i te koroheketanga pāmahana-tiketike o waho mō te wā roa) me te whakamaroke o ngā papa epoxy mō ngā papa ara iahiko kounga teitei, hei whakarei ake i te pumau wera (ka taea te whakanui ake i te Tg o te rauemi kua whakamarokehia ki runga ake i te 180℃) me te kaha ā-pūkaha o ngā rauemi epoxy.
I te nuinga o te wā ka tākaihia ki te 25kg/pahu, ā, ka taea hoki te whakarite i te kete.
3,3',4,4'-Biphenyltetracarboxylic dianhydride CAS 2420-87-3
3,3',4,4'-Biphenyltetracarboxylic dianhydride CAS 2420-87-3
