Chapter6 - Chapter 6 Noncrystalline and Semicrystalline...

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Unformatted text preview: Chapter 6 Noncrystalline and Semicrystalline Materials Introduction Glass Transition Temperature Viscous Deformation Structure and Properties of Amorphous Oxide Glasses Structure and Properties of Amorphous and Semi-crystalline Polymers Structure and Properties of Rubbers and Elastomers Metallic Glasses Some Glass Forming Systems Elements S, Se, P O x i d e s S i O 2 , B 2 O 3 , P 2 O 5 , GeO 2 , AsO 2 Halides BF 2 , AlF 3 , ZnCl 2 , Ag(Cl,Br,I),Pb(Cl 2 ,Br 2 ,I 2 ) Sulfides As 2 S 3 , Sb 2 S 3 Selenides Various compounds of Tl, Sn, Pb, As, Sb, Bi, Si, and P Tellurides Various compounds of Tl, Sn, Pb, As, Sb, Bi and Ge N i t r i d e s K N O 3-Ca(NO 3 ) 2 and many mixtures containing alkali and alkaline earth nitrates Sulfates KHSO 4 and many other binary and ternary mixtures Carbonates K 2 CO 3-MgCO 3 Polymers Polystyrene, PMMA, polycarbonate, PET Metallic Alloys Au 4 Si, Pd 4 Si, (Fe-Si-B) alloys, Al-transition metal rare earths Specific Volume for a Variety of Materials Liquid to glass solid transformation in a pure substance. The glass transition temperature, Tg, is not an equilibrium transformation temperature. Liquid to crystalline solid transformation for a pure substance. T m is an equilibrium transformation temperature The Effect of Cooling Rate on the Glass Transition Temperature, T g Specific Volume T g1 T g2 T m Temperature T 1 . T 2 . T 1 . T 2 . Liquid Liquid Solid Glass (Glassy behavior) Super Super-cooled liquid cooled liquid (Rubbery behavior) (Rubbery behavior) > The above figure describes the variation in specific volume of a pure substance undergoing a liquid to solid phase transformation. On the same plot the variation in specific volume is shown for a super-cooled liquid cooled to produce a glassy structure. 1. Plot the variation in entropy as a function of temperature for these two processes....
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Chapter6 - Chapter 6 Noncrystalline and Semicrystalline...

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