Qhov Tseem Ceeb - Polyamide vs Polyimide
Polyamide thiab polyimide yog cov kub-resistant thermoplastic elastomers nrog ntau yam kev siv. Qhov sib txawv loj ntawm polyamide thiab polyimide yog nyob rau hauv lawv cov qauv tshuaj; polyamide muaj cov amide (-CONH-) linkages nyob rau hauv lawv cov pob txha polymer, thaum polyimide muaj imide pawg (-CO-N-OC-) nyob rau hauv lawv cov pob txha polymer.
Ob lub polymers no tseem paub txog lawv cov khoom siv hluav taws xob zoo thiab lub cev ntxiv rau qhov siab thermal stability.
YPolyamide yog dab tsi?
Polyamides yog cov thermoplastic elastomers uas muaj kev ua tau zoo los ntawm lawv qhov kev pabcuam siab kub, zoo tshav kub laus, thiab hnyav ua haujlwm. Tsis tas li ntawd, polyamides muaj cov qauv siab thiab cov khoom cuam tshuam, tsis tshua muaj coefficient ntawm kev sib txhuam, thiab kev ua haujlwm siab. Txawm hais tias polyamides tau tsim kom muaj ntau yam khoom, lawv txhua tus muaj cov kev sib txuas ntawm amide (-CONH-) hauv lawv cov pob txha polymer. Nylon yog hom polyamide feem ntau siv thiab siv dav; Qhov no yog ib qho ntawm cov polymers ntxov tshaj plaws tsim los ntawm Carothers. Niaj hnub no nylon yog ib qho ntawm cov khoom siv tseem ceeb tshaj plaws thiab siv dav hauv Tebchaws Meskas.
Daim duab 1: Polyamide
Cov pab pawg amide yog ib pawg polar, uas tso cai rau polyamides los tsim hydrogen bonds ntawm chains, yog li txhim kho cov interchain attraction. Qhov no txhim kho cov khoom siv kho tshuab ntawm polyamide. Nyob rau hauv nylon, hloov tau yooj yim aliphatic carbon pawg hauv cov saw txhim kho cov txheej txheem ntawm cov khoom los ntawm kev txo cov yaj viscosity. Lub zog thiab nruj tuaj yeem raug txo los ntawm kev nce cov pa roj carbon atom ntawm cov kev sib txuas ntawm amide. Yog li ntawd, qhov ntev ntawm cov pob txha hydrocarbon yog cov cuab yeej tseem ceeb uas txiav txim siab qhov ua tau zoo ntawm cov khoom siv polyamide. Vim lub polarity ntawm pawg amide, polar solvents, feem ntau yog dej, tuaj yeem cuam tshuam rau polyamides.
Muaj ob hom polyamides: aliphatic thiab aromatic polyamides. Nylon tuaj yeem yog aliphatic lossis semi-aromatic polyamide. Cov kev siv tseem ceeb ntawm polyamides muaj xws li radiator header tso tsheb hlau luam nyob rau hauv lub tshuab cua txias, keyboards, connectors, ignition Cheebtsam, sensors thiab lub cev muaj zog qhov chaw nyob rau hauv nws pib hluav taws xob systems, log trims, throttle li qub, engine npog, tshav kub resistant under-bonnet Cheebtsam, airbrake tubing, thiab lwm yam.
YPolyimide yog dab tsi?
Polyimides yog cov polymers ua tau zoo, muaj cov pab pawg imide (-CO-N-OC-) hauv lawv cov chav nyob. Cov saw hlau polymer yog cov saw qhib lossis kaw cov saw hlau. Polyimides paub txog lawv cov thermal stability zoo, nrog rau cov khoom siv hluav taws xob zoo thiab cov khoom siv kho tshuab. Feem ntau, polyimide muaj luv luv qhov kub thiab txias stability. Ntxiv mus, polyimide qhia tau hais tias zoo heev hnav thiab hnyav ua haujlwm, thiab kuj muaj kev puas tsuaj siab. Cov khoom no tau coj polyimide los ua cov khoom siv tshwj xeeb hauv qee yam kev siv xws li insulating films, laminates, coatings, molded parts, structural adhesives, high-modulus fibers, permseletive membranes and high-temperature composites.
Daim duab 2: Polyimide
Soluble copolyimides yog siv los ua cov nplaum, sealants thiab molding resins. Zoo oxidative stability thiab lub iav siab hloov pauv kub (t g) tuaj yeem ua tiav nrog polyimide nrog cov qauv aromatic. Raws li cov txheej txheem synthesis, polyimides tau muab faib ua peb pawg, uas yog; Condensation polymers-tsis melting thiab thermoplastic, ntxiv polymers thiab hybrid polymers.
Qhov txawv ntawm Polyamide thiab Polyimide yog dab tsi?
YPolyamide vs Polyimide |
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| Polyamides yog ua los ntawm amide linkages (-CONH-). | Polyimides yog ua los ntawm imide linkages (-CO-N-OC-). |
| Synthesis | |
| Polyamides yog synthesized los ntawm polymerization ntawm diamines thiab dicarboxylic acid. | Polyimides yog tsim los ntawm polymerization ntawm dianhydride thiab diisocyanate lossis diamine. |
| tshuaj formula | |
| Cov npe lag luam feem ntau yog Nylon thiab Kelvar. | Lub npe lag luam yog Kapton. |
| Daim ntawv thov | |
| Polyamides yog siv los ua lub tshuab hluav taws xob hauv lub tshuab cua txias; keyboards, connectors, ignition Cheebtsam, sensors thiab lub cev muaj zog qhov chaw nyob rau hauv nws pib hluav taws xob systems; log trims, throttle li qub, cav npog, tshav kub resistant under-bonnet Cheebtsam, airbrake tubing, thiab lwm yam | Polyimides yog siv los ua cov yeeb yaj kiab insulating, laminates, coatings, molded parts, structural adhesives, high-modulus fibers, permselective membranes thiab high-temperature composites |
Summary – Polyamide vs Polyimide
Ob leeg polyamide thiab polyimide yog cov thermoplastic elastomers nrog siab thermal thiab oxidative stability. Polyamide muaj cov kev sib txuas ntawm amide hauv lawv cov pob txha thiab yog synthesized los ntawm polymerization ntawm diamine thiab dicarboxylic acid. Polyimide muaj imide linkages nyob rau hauv lawv cov caj qaum thiab yog synthesized los ntawm lub polymerization ntawm dianhydride thiab diisocyanate los yog diamine. Qhov no yog qhov txawv ntawm polyamide thiab polyimide.
