Core Molecular Thaum tshav kub kub-Resistance Mechanisms
- Kev txhawb zog ntawm cov saw hlau molecular rigidity: Cov qauv nruj- xws li cov nplhaib uas muaj ntxhiab lossis cov pab pawg loj heev - tau nkag mus rau hauv cov pob txha polymer. Cov no txwv qhov pub dawb oscillation thiab kev sib hloov ntawm cov saw hlau molecular, yog li ua kom cov khoom siv iav hloov kub.
- Txhim kho ntawm cov rog intermolecular: Kev sib cuam tshuam ntawm cov saw hlau molecular yog tsim los ntawm txoj hauv kev xws li qhia cov pawg polar lossis tsim cov ntawv cog lus hydrogen. Qhov no ua rau lub zog pib xav tau rau cov saw hlau molecular kom dhau los ntawm cov txheeb ze slippage.
- Peb -sib txawv cross- txuas cov qauv sib txuas: Thermosetting siab- cov yas kub ua rau cov khoom tsis sib haum xeeb ntawm cov saw hlau molecular los ntawm cov tshuaj tiv thaiv. Qhov no tsim kom muaj kev ruaj khov, peb - cov qauv sib txuas sib txuas uas tsim los tiv thaiv kev ntws los yog deformation ntawm cov saw hlau molecular.
- Cov qauv crystalline tau txiav txim siab heev: Qee cov thermoplastic siab- cov yas kub muaj qhov tshwj xeeb tshaj tawm cov saw hlau molecular uas tsim cov cheeb tsam ntom ntom. Cov chains yog nruj nreem ntim, yuav tsum tau kub siab heev los cuam tshuam cov qauv txiav txim no; Piv txwv li, cov qauv crystalline ntawm isotactic polypropylene (PP) tso cai rau nws ua tiav qhov melting point ntawm 160-170 degree.
Cov Ntsiab Cai Tshwj Xeeb ntawm Common High-Temperature Resistant Plastics
- PP (Polypropylene): Methyl pawg ntawm cov saw hlau molecular yog taw qhia los tsim cov qauv isotactic, uas ua rau muaj crystallinity siab thiab melting point ntawm kwv yees li 160-170 degree. Nws tseem ruaj khov thaum lub sij hawm ntev - siv ntawm qhov kub ntawm 100-120 degree, ua rau nws yog cov khoom siv tseem ceeb rau cov cua sov-resistant, zaub mov- qib ntim.
- Bakelite (Phenolic resin): Ib hom thermosetting yas uas tsim ib qho irreversible peb -sib nqus network qauv tom qab molding. Nws tsis soften los yog deformed nyob rau hauv cov cua sov, ua rau nws dav siv nyob rau hauv daim ntawv thov uas muaj kev kub siab - kub, xws li cookware handles.
- High-kev ua tau zoo engineering yas (piv txwv li, PPS, PEEK): Cov pob txha muaj zog uas muaj ntau cov qauv nruj (xws li benzene rings) ua ke nrog cov muaj zog intermolecular rog. Lawv tuaj yeem tiv taus ntev -lub sijhawm ua haujlwm kub siab tshaj 250 degree, ua tau raws li qhov xav tau ntawm qhov chaw huab cua hauv cov haujlwm xws li aerospace thiab precision electronics.