Following - is the complete Answer -&- Explanation - to - all parts ( i.e. parts - (a), (b) & (c) ), of the given Question...
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(9a) What material type has a glass transition temperature (Tg)? (9b) How do the material properties...
(2 points). Is it possible for a polymer to have both a glass transition temperature, Tg, and a melting temperature, Tm? How is this explained thermodynamically?
Clumping of dried milk can be reduced by controlling glass transition temperature (Tg) during drying True or false? A sol is a dispersion of a solid in a liquid, whereas a gel is a dispersion of a liquid in a solid True or false? A change of state from water to steam has no effect on the volume of batters and doughs when they are being baked or fried True or false?
How to determine the glass transition temperature of a polymer? What factors will affect the glass transition temperature?
High density polyethylene (HDPE) has a glass transition temperature below 0 C. However, HDPE appears as plastic rather than a rubbery material at room temperature. Why? (Max 100 words) (5 Points) Enter your answer What is the glass state? What is the glass transition temperature? (Max 100 words) (5 Points) ) Enter your answer Why polymers do not want to mix? (Consider the entropy and enthalpy effects, and compare to small molecular compounds.) (Max 100 words) (5 Points) Enter your...
Material science 1) Polypropylene (PP) has a glass-transition temperature of -15 oC and a melting temperature of 175 oC. This means that at a temperature of -40 oC that PP is ________, and at temperature 0 oC PP is _________ . (A) brittle, brittle (B) ductile, brittle (C) brittle, ductile (D) ductile, ductile (E) low in thermal conductivity, high in thermal conductivity. .2) Galvanized steel corrodes slowly in air because: (A) the...
Question 2. a) What is the distinction between glass transition temperature and melting temperature? (Perhaps use a sketch to explain) b) Relating to the previous question (and sketch?) explain why glass may be drawn into fibres, whereas crystalline alumina may not c) Borosilicate glasses and fused silica exhibit higher resistance to thermal shock, to some ofthe more day-to-day glasses and ceramics. Why is this so? End of Tutorial Questions
1. What do we mean by thermoplastic polymer? 2. What is the definition of thermosetting polymer? 3. What is glass transition temperature (as it relates to polymers)? 4. What is the meaning of crosslinking as it relates to polymers? a) In terms of tensile strength, melting point etc. how does a crosslinked polymer compare with a non-crosslinked polymer? b) Draw a simple schematic diagram of linear polyethylene and crosslinked polyethylene (chemical structure of ethylene is CH2 = CH2).
Problem 2. a. Explain qualitatively why ni increases with increasing temperature. b. How do the properties of wide-bandgap semiconductors differ from those of narrow bandgap semiconductors? Why do you think SiC, a wide-bandgap semiconductor, is used in high-temperature semiconductor devices? The figure below may be helpful for your response. e 1013 107 4H-SiC 1011 1.0 1.5 2.0 2.5 3.0 3.5 4.0 1000/Temperature (1/K)
1. What is difference amongst thermoplastic, thermosets and elastomers? Include one example of each. 2. Explain how stress strain behaviour of thermoplastics, elastomers and brittle materials differ? Include stress strain curves. 3. What is a glass transition point? Explain through the curves for glass and crystalline materials. 4. How a temperature drop of 50 C below 0 C would affect polythene bottle? Explain. 5. What type of bonding explains function of adhesives? 6. Why plastic beams are not used to...
What are the properties of Python lists and how do they differ from tuples?