Classification System ntawm Polymethacrylimide (PMI) Ua Npuas Ncauj
Polymethacrylimide (PMI) ua npuas ncauj, raws li qhov siab - cov khoom ua haujlwm ua npuas ncauj, tuaj yeem raug cais raws li cov khoom siv raw, microstructure, thiab cov yam ntxwv ua haujlwm. Cov kev faib tshwj xeeb thiab lawv cov khoom muaj raws li hauv qab no:
I. Kev faib tawm los ntawm Raw Material Monomer Composition
Qhov kev faib tawm no yog txhais los ntawm qhov sib txawv ntawm cov tub ntxhais copolymer monomers, feem ntau muab faib ua ob ntu loj: Mono-Methyl Series thiab Di-Methyl Series. Muaj qhov sib txawv ntawm lawv nyob rau hauv cov nqe lus ntawm kev tsim khoom, zoo li, thiab kev ua tau zoo.
Mono-Methyl Series PMI Ua Npuas Ncauj:Feem ntau npaj los ntawm dawb radical copolymerization siv methacrylic acid thiab acrylonitrile ua lub ntsiab monomers. Hom ua npuas ncauj no feem ntau muaj xim daj daj. Txij li thaum cov khoom siv raw khoom ntawm acrylonitrile yog qis dua li ntawm methacrylonitrile, nws muaj kev lag luam zoo thiab feem ntau hu ua "qis- nqi ua npuas ncauj" lossis "daj npuas." Nyob rau hauv cov nqe lus ntawm kev ua tau zoo, cov cim tseem ceeb xws li txhua yam muaj zog thiab thermal stability yog me ntsis qis dua cov khoom Di-Methyl Series.
Di-Methyl Series PMI Ua Npuas Ncauj:Npaj los ntawm cov dawb radical copolymerization siv methacrylic acid thiab methacrylonitrile ua cov tub ntxhais monomers. Hom ua npuas ncauj no feem ntau yog dawb hauv qhov tsos thiab feem ntau hu ua "dawb npuas" hauv kev lag luam. Piv nrog rau Mono-Methyl Series, nws cov qauv saw hlau polymer yog ruaj khov dua, muab kev ua tau zoo tag nrho.
II. Kev faib tawm los ntawm Microstructural Cell Size
Raws li qhov sib txawv me me ntawm cov qauv pore sab hauv, PMI ua npuas dej tuaj yeem muab faib ua plaub qib nrog kev txo qis hauv cov xov tooj ntawm tes: ntxhib- cell, nruab nrab- cell, nplua - cell, thiab microcellular. Ua npuas ncauj ntawm cov qib cell loj sib txawv hauv thaj chaw tshwj xeeb, ua pa, thiab thauj khoom -cov yam ntxwv ntawm cov kabmob, ua rau lawv tsim nyog rau cov xwm txheej sib txawv.
III. Classification los ntawm Functional Characteristics
Raws li cov kev taw qhia ntawm kev hloov kho kev ua haujlwm thiab cov kev xav tau ntawm daim ntawv thov, PMI ua npuas ncauj tuaj yeem muab faib ua ob pawg loj: General- Lub Hom Phiaj thiab Kev Ua Haujlwm Tshwj Xeeb. Tshwj xeeb Functional foams ua tiav cov kev ua tau zoo los ntawm kev tsim qauv molecular lossis kev hloov pauv sib xyaw, suav nrog:
General -Lub hom phiaj:Muaj cov yam ntxwv tseem ceeb ntawm PMI ua npuas ncauj yam tsis muaj kev ua haujlwm tshwj xeeb, tsim nyog rau cov ntawv sau cov qauv siv.
Hom Kev Ua Haujlwm Tshwj Xeeb:Encompass ntau yam xws li:
Wave -Absorbing:Muaj peev xwm nqus tau electromagnetic yoj.
Nplaim-Retardant:Ua tau raws li cov qauv ntsuas hluav taws xob tshwj xeeb.
Siab -Toughness:Txhim kho qhov cuam tshuam toughness zoo heev.
Wave-pob tshab:Tsawg dielectric poob, haum rau electromagnetic kis scenarios.
Kev nqus dej tsawg:Dej saturation absorption tus nqi qis dua li cov khoom lag luam.
Kub-Resistant:Khaws cov qauv kev ruaj ntseg nyob rau hauv huab cua kub ib puag ncig.
Siab -Lub zog:Zoo heev tensile thiab compressive zog ntsuas.
