How to determine the glass transition temperature of a polymer? What factors will affect the glass transition temperature?
How to determine the glass transition temperature of a polymer? What factors will affect the glass...
(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?
The glass transition temperature of PS and PB are 95 °C and -90 °C, respectively. What is the glass transition of 50 wt% PS - 50 wt.% PB of immiscible polymer blend?
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).
(9a) What material type has a glass transition temperature (Tg)? (9b) How do the material properties differ below and above the glass transition temperature (Tg)? (9c) What material type has a melting temperature only and no Tg?
1) How do temperature and rate affect the yield strength of polymer nanocomposites? Is there a model that can be used to predict the affect of temperature and strain rate on the yield strength. Please describe this model.
A new polymer, a Polymer XYZ was found to soften 50c. Several experiements were performed to determine if the softening was a glass transition or a melting point a. explain the experiemental methods exhibiting in Figure A through D b the theromcouple of the experiment A was broken thus T(temperature) wasnt recorded. Explain what happened in the polymer at Ta in Figure A. Comare to the other results is Ta equal to 50c or high/lower than 50C C. through the...
What is the Glass Transition? How is it differentiated from a liquid-solid transition?
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
What are the factors influencing the fluidity and phase transition temperature of a membrane? How is the Ras protein anchored to the cell membrane? How lipid molecules influence membrane curvature formation? Which lipid molecules give preference to formation of different curvatures on membrane? Why facilitated transport across membrane is a saturable process? How do small hydrophobic molecules cross a membrane? Which lipids form/maintain the liquid-ordered raft structures in the cell membrane? How does the pancreatic lipase cleave triglycerides? How do...
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...