Qhov sib txawv tseem ceeb ntawm TG thiab TM polymers yog tias TG ntawm polymers piav qhia txog kev hloov pauv ntawm lub xeev iav mus rau hauv lub xeev rubbery whereas TM ntawm polymers piav qhia txog kev hloov pauv ntawm lub xeev crystalline rau hauv lub xeev amorphous.
Cov ntsiab lus TG (lossis Tg) thiab TM (lossis Tm) muab ob qhov tseem ceeb ntawm cov khoom siv polymers. Cov no yog qhov kub ntawm qhov kev ntxhib los mos ntawm polymer hloov. Cov txiaj ntsig no yog cov yam ntxwv ntawm cov polymers. TG yog hais txog lub iav hloov pauv qhov kub thiab txias thaum TM hais txog qhov kub thiab txias.
TG ntawm Polymers yog dab tsi?
TG ntawm polymers lossis TG polymers yog iav hloov kub. Ntawm qhov kub no, lub zog, lub zog iav ntawm amorphous polymer hloov mus rau hauv lub xeev rubbery. Tshwj xeeb, cov thermosetting polymers tau txais qhov kev hloov pauv no, thaum cov thermoplastic polymers tau melting ntau dua li hloov mus rau hauv lub xeev rubbery.
Thermosetting polymers qhia tau hais tias lub zog khov thiab khov khov. Txawm li cas los xij, lub xeev rubbery yog viscous thiab pliable. Tsis tas li ntawd, cov ntshiab crystalline polymers tsis muaj qhov hloov pauv iav no vim tias lawv yaj ntau dua li hloov mus rau hauv lub xeev iav. Yog li ntawd, amorphous thiab semi-crystalline polymers muaj iav hloov kub. Muaj qee yam uas cuam tshuam rau qhov kev hloov dua siab tshiab no; chemical qauv ntawm lub polymer, molecular hnyav ntawm lub polymer, muaj cov plasticizers, yooj, thiab lwm yam. Lub TG txiav txim siab cov kev siv ntawm cov polymer; Piv txwv li, ib qho tawv polymer uas tsis tshua muaj TG yog haum rau cov ntawv thov kub.
TM ntawm Polymers yog dab tsi?
TM ntawm polymers lossis TM polymers yog qhov kub thiab txias. Nyob rau ntawm qhov kub no, lub crystalline theem ntawm polymer hloov mus rau hauv cov khoom amorphous theem. Yog li ntawd, qhov no txawv ntawm cov txheej txheem melting ib txwm ntawm lwm cov ntaub ntawv uas muag theem hloov mus rau theem ua kua. Lo lus no siv hais txog cov thermoplastics vim tias cov thermosets tau decomposition ntawm qhov kub thiab txias ntau dua li melting.
Daim duab 01: Kev sib piv ntawm TG thiab TM
Ntxiv mus, qhov no yog thawj qhov kev txiav txim siab thiab cov tshuaj tiv thaiv endothermic ib yam nkaus. Peb tuaj yeem siv cov enthalpy ntawm melting ntawm cov polymer los xam cov degree ntawm crystallinity.
Qhov txawv ntawm TG thiab TM Polymers yog dab tsi?
TG ntawm polymers yog lub iav hloov pauv kub ntawm lub polymer thaum TM ntawm polymers yog qhov kub ntawm cov polymer. Qhov sib txawv tseem ceeb ntawm TG thiab TM polymers yog tias TG piav qhia txog kev hloov pauv ntawm lub xeev iav mus rau hauv lub xeev rubbery thaum TM piav qhia txog kev hloov pauv ntawm lub xeev crystalline mus rau hauv lub xeev amorphous. Yog li ntawd, raws li lwm qhov sib txawv tseem ceeb ntawm TG thiab TM polymers, peb tuaj yeem hais tias TG piav qhia txog kev hloov pauv ntawm cov theem ntawm cov teeb meem (khoom rau roj hmab theem) tab sis, TM tsis piav qhia txog kev hloov pauv ntawm cov theem ntawm cov teeb meem (khoom rau khoom.).
Ib qhov sib txawv ntxiv ntawm TG thiab TM polymers yog tias TG muaj feem xyuam rau amorphous thiab semi-crystalline polymers thaum lub TM muaj feem xyuam rau semi-crystalline thiab crystalline polymers.
Summary – TG vs TM Polymers
TG thiab TM yog qhov ntsuas kub tseem ceeb ntawm cov polymers. Qhov sib txawv tseem ceeb ntawm TG thiab TM polymers yog tias TG ntawm polymers piav qhia txog kev hloov pauv ntawm lub xeev iav mus rau hauv lub xeev rubbery thaum TM ntawm polymers piav qhia txog kev hloov pauv ntawm crystalline xeev mus rau hauv lub xeev amorphous.
