Hei whakatika i te take o te ngāwari o ngā paninga polyurethane tuku iho ki te pakaru, me te kore e taea te whakaora i a ia anō, i whakawhanakehia e ngā kairangahau he paninga polyurethane whakaora-ake kei roto ko te 5 wt% me te 10 wt% ngā kaihoko whakaora mā te tikanga cycloaddition Diels-Alder (DA). E whakaatu ana ngā hua ko te whakaurunga o ngā kaihoko whakaora ka whakanui ake i te pakeke o te paninga mā te 3%–12%, ā, ka tutuki te pai o te whakaora i te karawarawa o te 85.6%–93.6% i roto i te 30 meneti i te 120 °C, ka roa ake te roa o te ora o ngā paninga. Ka whakaratohia e tēnei rangahau he otinga auaha mō te tiaki mata o ngā rauemi hangarau.
I roto i te ao hangarau rauemi, kua roa te whakatikatika i ngā kino ā-mīhini i roto i ngā rauemi paninga hei wero nui. Ahakoa he pai te ātete ki te huarere me te piri o ngā paninga polyurethane tuku iho, ka tere te heke o tā rātou mahi tiaki ina puta he karawarawa, he pakaru rānei. Nā te whakaaweawe a ngā tikanga whakaora-ake koiora, kua tīmata ngā kaipūtaiao ki te tūhura i ngā rauemi whakaora-ake i runga i ngā hononga honohono hihiri, me te aro nui ki te tauhohenga Diels-Alder (DA) nā ōna āhuatanga tauhohenga ngawari me te pai o te whakahokinga. Heoi, ko ngā rangahau o nāianei kua arotahi ki ngā pūnaha polyurethane raina, ka waiho he āputa i roto i te rangahau i ngā āhuatanga whakaora-ake i roto i ngā paninga paura polyurethane whakawhiti-hono.
Hei wawahi i tēnei arai hangarau, i whakaurua e ngā kairangahau o te motu ngā rongoā whakaora DA e rua—te furan-maleic anhydride me te furan-bismaleimide—ki roto i tētahi pūnaha kapia polyester hydroxylated, hei whakawhanake i tētahi paninga paura polyurethane me ngā āhuatanga whakaora-ake pai rawa atu. I whakamahia e te rangahau te ¹H NMR hei whakaū i te hanganga o ngā rongoā whakaora, te calorimetry matawai rerekētanga (DSC) hei manatoko i te taea o te whakahokinga o ngā tauhohenga DA/retro-DA, me ngā tikanga nanoindentation me te profilometry mata hei aromatawai pūnaha i ngā āhuatanga hangarau me ngā āhuatanga mata o ngā paninga.
Mō ngā tikanga whakamātautau matua, i hangaia tuatahitia e te tīma rangahau ngā matū whakaora DA kei roto he hydroxyl mā te whakamahi i tētahi tikanga e rua ngā taahiraa. I muri mai, i whakaritea ngā paura polyurethane kei roto he matū whakaora 5 wt% me te 10 wt% mā te whakaranu rewa, ā, i pania ki runga i ngā papa maitai mā te whakamahi i te rehu hiko. Mā te whakataurite ki ngā rōpū whakahaere kāore he matū whakaora, i tirotirohia te awe o te kukū o te matū whakaora ki ngā āhuatanga o te rauemi.
1.Ka whakaū te tātaritanga NMR i te hanganga o te kaihoko whakaora
I whakaatuhia e ngā irahiko H NMR 1 ko te furan-maleic anhydride (HA-1) i whakaurua ki te amine i whakaatu i ngā tihi mowhiti DA motuhake i te δ = 3.07 ppm me te 5.78 ppm, i te mea ko te furan-bismaleimide adduct (HA-2) i whakaatu i te tohu pūmua here DA noa i te δ = 4.69 ppm, e whakaū ana i te angitu o te hanganga o ngā kaihoko whakaora.
2.E whakaatu ana te DSC i ngā āhuatanga whakahurihuri wera
I whakaatuhia e ngā ānau DSC ko ngā tauira kei roto ngā matū whakaora i whakaatu i ngā tihi werawera mō te tauhohenga DA i te 75 °C me ngā tihi āhuatanga mō te tauhohenga retro-DA i te awhe 110–160 °C. I piki ake te horahanga tihi me te nui ake o te ihirangi matū whakaora, e whakaatu ana i te pai o te whakahurihuri wera.
3.E whakaatu ana ngā whakamātautau nanoindentation i te whakapainga o te mārō
I whakaatuhia e ngā whakamātautau nanoindentation tairongo-hohonu ko te tāpiri o ngā kaihoko whakaora 5 wt% me te 10 wt% i whakapiki i te pakeke o te paninga mā te 3% me te 12%, ia. I puritia te uara pakeke o te 0.227 GPa ahakoa te hohonutanga o te 8500 nm, e pā ana ki te whatunga honohono i hangaia i waenga i ngā kaihoko whakaora me te matrix polyurethane.
4.Tātaritanga Āhua o te Mata
I whakaatuhia e ngā whakamātautau taratara o te mata he 86% te uara Rz o te papa i whakaitihia e ngā paninga polyurethane parakore, ā, he iti noa te pikinga o te taratara o ngā paninga me ngā matūriki whakaora nā te mea he nui ake ngā matūriki. I whakaatuhia e ngā whakaahua FESEM ngā huringa o te kakano o te mata i puta mai i ngā matūriki matūriki whakaora.
5.Te Aranga Hou i roto i te Whai Huatanga o te Whakaora i te Rakuraku
I whakaatuhia e ngā tirohanga karuārai whatu, i muri i te maimoatanga wera i te 120 °C mō te 30 meneti, i whakaatuhia e ngā paninga kei roto he 10 wt% te kaihoko whakaora, he whakahekenga i te whānui o te karawarawa mai i te 141 μm ki te 9 μm, ā, ka eke ki te pai o te whakaora o te 93.6%. He tino pai ake tēnei mahi i tērā i kōrerotia i roto i ngā tuhinga o nāianei mō ngā pūnaha polyurethane raina.
I whakaputaina ki roto i te Next Materials, he maha ngā auahatanga o tēnei rangahau: Tuatahi, ko ngā paninga paura polyurethane kua whakarerekētia e te DA kua whakawhanakehia ka whakakotahi i ngā āhuatanga miihini pai me te kaha whakaora-ake, ka eke ki te whakapainga pakeke tae atu ki te 12%. Tuarua, ko te whakamahinga o te hangarau rehu hikohiko ka whakarite kia rite te horapa o ngā kaihoko whakaora i roto i te whatunga honohono-whiti, ka wikitoria i te hapa tūnga e kitea ana i roto i ngā tikanga microcapsule tuku iho. Ko te mea nui, ka eke ēnei paninga ki te pai o te whakaora i te pāmahana iti (120 °C), ka nui ake te whakamahinga ahumahi ki te whakataurite ki te pāmahana whakaora 145 °C kua ripoatahia i roto i ngā tuhinga o nāianei. Ehara i te mea ka whakaratohia e te rangahau he huarahi hou ki te whakaroa i te roa o te ratonga o ngā paninga hangarau engari ka whakatūhia hoki he anga ariā mō te hoahoa ngota ngota o ngā paninga mahi mā roto i tana tātaritanga tauanga o te whanaungatanga "kukū-mahi kaihoko whakaora". Ko te arotautanga ā muri ake nei o te ihirangi hydroxyl i roto i ngā kaihoko whakaora me te ōwehenga o ngā hononga-uretdione e tumanakohia ana ka pana ake i ngā rohe mahi o ngā paninga whakaora-ake.
Wā tuku: Hepetema-15-2025