PI fim halaye na mica board

1. Bisa ga thermogravimetric bincike, da bazuwar zafin jiki na cikakken aromatic polyimide ne kullum a kusa da 500 ℃. Polyimide da aka haɗa daga biphenyl dianhydride da p-phenylenediamine yana da zafin bazuwar thermal na 600 ℃, wanda shine ɗayan manyan kwanciyar hankali na thermal na polymers ya zuwa yanzu.

2. Polyimide na iya jure matsanancin yanayin zafi, kamar ba mai karyewa da fashewa a cikin helium mai ruwa a -269 ° C.

3. Polyimide yana da kyawawan kaddarorin inji. Ƙarfin da ba a cika ba ya fi 100Mpa, fim ɗin Kapton (Kapton) yana sama da 170Mpa, kuma nau’in biphenyl polyimide (UplexS) ya kai 400Mpa. A matsayin filastik injiniya, yawan adadin fim din yawanci shine 3-4 Gpa, kuma fiber zai iya kaiwa 200 Gpa. Dangane da ƙididdigar ka’idar, fiber ɗin da aka haɗa ta phthalic anhydride da p-phenylenediamine zai iya kaiwa 500 Gpa, na biyu kawai ga fiber carbon.

4. Wasu nau’in polyimide ba su narkewa a cikin garkuwar jiki, tsayayye don narkar da acid, kuma nau’ikan janar ba su da tsayayya da hydrolysis. Wannan aikin da ake ganin gazawa ya sa polyimide ya zama babban bambanci daga sauran polymers masu girma. Halin wannan shine cewa albarkatun ƙasa dianhydride da diamine za a iya dawo dasu ta hanyar alkaline hydrolysis. Misali, don fim ɗin Kapton, ƙimar dawowa zai iya kaiwa 80% -90%. Canza tsarin na iya samar da nau’ikan da ke da juriya ga hydrolysis, kamar waɗanda za su iya jure tafasawa a 120 ° C na sa’o’i 500.

5. Thermal fadada coefficient na polyimide shine 2 × 10-5-3 × 10-5 ° C, Guangcheng thermoplastic polyimide shine 3 × 10-5 ° C, nau’in biphenyl zai iya kaiwa 10-6 ° C, kuma ana samun nau’ikan mutum ɗaya. . Har zuwa 10-7 ° C.

6. Polyimide yana da babban juriya na radiation, kuma ƙarfin riƙewar fim ɗinsa shine 90% bayan 5 × 109rad mai saurin watsawa na lantarki.

7. Polyimide yana da kyawawan kaddarorin Dielectric. Matsakaicin dielectric yana kusan 3.4. Gabatar da furotin ko tarwatsa girman nanometer na iska a cikin polyimide, za a iya rage madaidaicin dielectric zuwa kusan 2.5. Asarar dielectric shine 10-3, kuma ƙarfin dielectric shine 100-300KV / mm. Ana iya kiyaye waɗannan kaddarorin a babban matakin a cikin kewayon zafin jiki mai faɗi da kewayon mitar.