Pehea e hoʻokaʻawale ai i ka ʻokoʻa ma waena o ka pre-oxidation/carbonization/graphitization

Pono e hoʻomake mua ʻia nā uea maka ma muli o PAN, hoʻokapona i ka wela haʻahaʻa, a hoʻokapona i ka wela kiʻekiʻe e hananā olonā kalapona, a laila hoʻopili ʻia e hana i nā olonā graphite. Hiki ke mahana mai 200℃ a i 2000-3000℃, kahi e hana ai i nā hopena like ʻole a hana i nā ʻano like ʻole, a he mau waiwai like ʻole.
1. Kahua Pyrolysis:ʻO ka pre-oxidation ma ka ʻāpana haʻahaʻa wela, ka carbonization haʻahaʻa wela ma ka ʻāpana kiʻekiʻe wela
Hana ʻia ka arylation pre-oxidation, kokoke i 100 mau minuke ka lōʻihi, a ʻo ka mahana o 200-300 ℃, ʻo ke kumu o ka thermoplastic PAN linear macromolecular chain i loko o kahi ʻano trapezoidal pale wela ʻole-plastic, ʻo ka hopena nui no ke kaulahao macromolecular o ka cyclization a me ka intermolecular crosslinking, me ka hopena pyrolysis a me ka hoʻokuʻu ʻana o nā mole liʻiliʻi he nui. ʻO ka helu arylation maʻamau he 40-60%.
Mahana hoʻoheheʻe kalapona haʻahaʻaʻO ka maʻamau, he 300-800 ℃, ʻo ia hoʻi ka hopena wela, ʻo ka hapa nui e hoʻohana ana i ka hoʻomehana ʻana o ka umu uila wela kiʻekiʻe, a hoʻopuka ke kahua i ka nui o ke kinoea hoʻopau a me ke kēpau.
Nā ʻano: E lilo ke kala o ka fiber pre-oxidized i ʻeleʻele, ʻeleʻele pinepine, akā e mālama mau ana i ke ʻano o ka fiber, ua loli ke ʻano o loko i kekahi ʻano o nā loli kemika, ka hoʻokumu ʻia ʻana o kekahi mau hui hana oxygen a me ka hoʻopili ʻana i ke ʻano, e kau ana i ke kumu no ka carbonization ma hope.
2. Kahua hoʻoheheʻe kalapona (wela kiʻekiʻe), ʻo ia ka pre-oxidation o ka precursor i loko o kahi lewa inert ma ke kiʻekiʻe o ka decomposition, ka wehe ʻana i ka mea i hoʻohui ʻia me nā heteroatoms carbon (e like me ka oxygen, hydrogen, nitrogen, etc.), i mea e hoʻonui ai i ka carbonization, ka hoʻokumu ʻana o ke kalapona amorphous a i ʻole ke ʻano kalapona microcrystalline. ʻO kēia kaʻina hana kahi hana nui i ka hoʻokumu ʻana o ka iwi kalapona. ʻO ka mahana ma waena o 1000-1800 ℃, ʻo ka hopena condensation thermal nui, hoʻohana ʻia ka hapa nui o nā mea hoʻomehana graphite no ka hoʻomehana ʻana.
Nā ʻano: ʻO ke kalapona ka ʻāpana nui o ka mea carbonized, ʻo ke ʻano he amorphous carbon a i ʻole ka chaotic graphite structure, ʻoi aku ka nui o kona conductivity uila a me nā waiwai mechanical i hoʻohālikelike ʻia me ka huahana pre-oxidation.
3. Ka hoʻopili ʻana i ke kiʻiʻO ia kahi hana wela hou o nā huahana carbonization i nā mahana kiʻekiʻe e hoʻolaha i ke ʻano o ke kalapona amorphous a i ʻole ke kalapona microcrystalline i kahi ʻano kristal graphite ʻoi aku ka maʻamau. Ma o ka hana o ka mahana kiʻekiʻe, ua hoʻonohonoho hou ʻia nā ʻātoma kalapona e hana i kahi ʻano papa lattice hexagonal me ke kiʻekiʻe o ke kuhikuhi ʻana, no laila e hoʻomaikaʻi nui ana i ka conductivity uila a me ka thermal a me ka ikaika mechanical o ka mea.
Nā ʻano: Loaʻa i ka huahana graphitized kahi ʻano graphite crystalline kiʻekiʻe, e hāʻawi ana i ka conductivity uila a me ka thermal maikaʻi loa, a me ka ikaika kikoʻī kiʻekiʻe a me ka modulus kikoʻī. No ka laʻana, modulus kiʻekiʻenā olonā kalaponaUa loaʻa ma o ke kiʻekiʻe o ka graphitization.
Nā ʻanuʻu kikoʻī a me nā koi lako no ka pre-oxidation, carbonization a me ka graphitization:
ʻOkikene mua: hana ʻia i ka lewa ma kahi mahana i kāohi ʻia o 200-300°C. Pono e hoʻopili ʻia ke kaumaha e hōʻemi i ka emi ʻana o ka fiber.
Ke kalapona ʻana: hana ʻia i loko o kahi lewa inert me ka hoʻonui mālie ʻana o ka mahana i 1000-2000°C.
Ka hoʻoheheʻe ʻana: hana ʻia ma nā mahana kiʻekiʻe (2000-3000°C), maʻamau i loko o kahi hakahaka a i ʻole kahi lewa inert.