Iji dozie nsogbu nke mkpuchi polyurethane nkịtị nke na-enwe ike imebi ma ghara inwe ike ịgwọ onwe ya, ndị nchọpụta mepụtara mkpuchi polyurethane nke nwere ihe ngwọta ọgwụgwọ 5 wt% na 10 wt% site na usoro cycloaddition Diels-Alder (DA). Nsonaazụ ya na-egosi na itinye ihe ndị na-agwọ ọrịa na-eme ka ike mkpuchi sie ike site na 3%–12% ma na-enweta arụmọrụ ọgwụgwọ ọkọ nke 85.6%–93.6% n'ime nkeji 30 na 120 °C, na-agbatị ndụ ọrụ nke mkpuchi ahụ nke ukwuu. Ọmụmụ ihe a na-enye ngwọta ọhụrụ maka nchekwa elu nke ihe injinia.
N'ihe gbasara ihe ndị dị n'ime ihe ndị dị n'ime ihe ndị e ji eme ihe, ịrụzi mmebi ígwè na ihe ndị e ji eme ihe mkpuchi abụrụla ihe ịma aka dị ukwuu kemgbe. Ọ bụ ezie na mkpuchi polyurethane ọdịnala na-egosipụta iguzogide ihu igwe dị mma na njikọta, arụmọrụ nchebe ha na-akawanye njọ ngwa ngwa ozugbo ọ gbawara ma ọ bụ gbawaa. Site n'ike mmụọ nsọ nke usoro ọgwụgwọ onwe onye nke ihe ndị dị ndụ, ndị ọkà mmụta sayensị amalitela inyocha ihe ndị na-agwọ onwe ha dabere na njikọ covalent siri ike, ebe mmeghachi omume Diels-Alder (DA) na-enweta nlebara anya dị ukwuu n'ihi ọnọdụ mmeghachi omume dị nro ya na mgbanwe dị mma. Agbanyeghị, nnyocha dị ugbu a elekwasịla anya na sistemụ polyurethane linear, na-ahapụ oghere n'ọmụmụ ihe gbasara ihe ndị na-agwọ onwe ha na mkpuchi ntụ ntụ polyurethane jikọtara ọnụ.
Iji merie ihe mgbochi teknụzụ a, ndị nchọpụta ime obodo webatara ihe abụọ na-agwọ DA—furan-maleic anhydride na furan-bismaleemide—n'ime sistemụ resin polyester hydroxylated, na-emepụta mkpuchi ntụ ntụ polyurethane nwere ihe ndị na-agwọ onwe ha nke ọma. Ọmụmụ ihe ahụ jiri ¹H NMR kwado nhazi nke ihe ndị na-agwọ ọrịa, calorimetry nyocha differential (DSC) iji chọpụta mgbanwe nke mmeghachi omume DA/retro-DA, na usoro nanoindentation yana profilometry elu iji nyochaa njirimara igwe na njirimara elu nke mkpuchi ahụ n'ụzọ zuru oke.
Maka usoro nnwale dị mkpa, ndị otu nyocha ahụ buru ụzọ mepụta ọgwụ DA nwere hydroxyl site na iji usoro nzọụkwụ abụọ. Mgbe nke ahụ gasịrị, e ji ngwakọta agbaze mee ntụ polyurethane nwere ihe ngwọta 5 wt% na 10 wt%, ma tinye ya na ihe ndị e ji ígwè mee site na iji mmiri ọkụ electrostatic. Site n'iji ya tụnyere otu ndị na-achịkwa na-enweghị ihe ngwọta ọgwụgwọ, a nyochachara mmetụta nke ntinye ihe ngwọta ọgwụgwọ na ihe onwunwe.
1.Nnyocha NMR kwadoro nhazi ihe na-agwọ ọrịa
1 H NMR spectra gosiri na amine-inserted furan-maleic anhydride (HA-1) gosipụtara elu mgbanaka DA nke nwere njirimara na δ = 3.07 ppm na 5.78 ppm, ebe furan-bismaleemide adduct (HA-2) gosipụtara akara proton DA bond nkịtị na δ = 4.69 ppm, na-akwado njikọ nke ihe ndị na-agwọ ọrịa nke ọma.
2.DSC Na-ekpughe Àgwà Ndị A Na-agbanwe n'Okpomọkụ
Usoro DSC gosiri na ihe nlele ndị nwere ihe na-agwọ ọrịa gosipụtara oke elu endothermic maka mmeghachi omume DA na 75 °C na oke elu njirimara maka mmeghachi omume retro-DA na oke nke 110–160 °C. Mpaghara elu ahụ mụbara site na ọdịnaya ihe na-agwọ ọrịa dị elu, na-egosi ike mgbanwe okpomọkụ dị mma.
3.Nnwale Nanoindentation Na-egosi Mmezi Ike
Nnwale nanoindentation ndị nwere mmetụta miri emi gosiri na mgbakwunye nke ihe ngwọta ọgwụgwọ 5 wt% na 10 wt% mụbara ike mkpuchi site na 3% na 12%, n'otu n'otu. A nọgidere na-enwe uru siri ike nke 0.227 GPa ọbụlagodi na omimi nke 8500 nm, nke sitere na netwọk njikọ cross-connected e guzobere n'etiti ihe ngwọta ọgwụgwọ na polyurethane matrix.
4.Nyocha nke Ọdịdị Elu Ala
Nnwale nke ịdị njọ n'elu gosiri na mkpuchi polyurethane dị ọcha belatara uru Rz nke substrate site na 86%, ebe mkpuchi nwere ihe ndị na-agwọ ọrịa gosipụtara ntakịrị mmụba na ịdị njọ n'ihi ọnụnọ nke obere ihe ndị buru ibu. Foto FESEM gosipụtara mgbanwe n'ụdị elu nke sitere na ihe ndị na-agwọ ọrịa.
5.Ihe Ịga nke Ọma n'Ịgwọ Ọrịa Ọkọ
Nlele anya nke ihe onyonyo gosiri na mkpuchi nwere ihe na-agwọ ọrịa nke ruru 10 wt%, mgbe a gwọchara ya na okpomọkụ nke 120 °C ruo nkeji iri atọ, gosipụtara mbelata n'obosara ọkọ site na 141 μm ruo 9 μm, na-enweta arụmọrụ ọgwụgwọ nke 93.6%. Arụmọrụ a dị elu karịa nke akọpụtara na akwụkwọ ndị dị ugbu a maka sistemụ polyurethane linear.
E bipụtara na Next Materials, ọmụmụ ihe a na-enye ọtụtụ ihe ọhụrụ: Nke mbụ, mkpuchi ntụ ntụ polyurethane nke DA gbanwere na-ejikọta ezigbo ihe eji arụ ọrụ yana ikike ịgwọ onwe onye, na-enweta mmụba siri ike ruo 12%. Nke abụọ, ojiji nke teknụzụ ịgba ọkụ electrostatic na-eme ka mgbasa nke ihe ndị na-agwọ ọrịa dị iche iche n'ime netwọk ejikọtara ọnụ, na-emeri enweghị nhazi ọnọdụ nke usoro microcapsule ọdịnala. Nke kachasị mkpa, mkpuchi ndị a na-enweta arụmọrụ ọgwụgwọ dị elu na obere okpomọkụ (120 °C), na-enye ọrụ ụlọ ọrụ ka ukwuu ma e jiri ya tụnyere okpomọkụ ọgwụgwọ 145 °C akọọrọ na akwụkwọ ndị dị ugbu a. Ọmụmụ ihe a abụghị naanị na ọ na-enye ụzọ ọhụrụ iji gbasaa ndụ ọrụ nke mkpuchi injinia kamakwa ọ na-eguzobe usoro echiche maka imewe molekul nke mkpuchi ọrụ site na nyocha ọnụọgụgụ ya nke mmekọrịta "njikọ nguzozi-arụmọrụ nke onye na-agwọ ọrịa". A na-atụ anya na nhazi n'ọdịnihu nke ọdịnaya hydroxyl na ihe ndị na-agwọ ọrịa na oke nke njikọ uretdione ga-akwalite oke arụmọrụ nke mkpuchi ọgwụgwọ onwe onye.
Oge ozi: Sep-15-2025