Discuss the reasons for the differences in glass transition temperature for the following pairs of polymers. Hint: check factors that affect Tg Polyethylene (-120°C) and polypropylene (-20°C)
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Discuss the reasons for the differences in glass transition temperature for the following pairs of
- Polyethylene (-120°C) and polypropylene (-20°C)
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- Discuss the suitable initiator to start an addition polymerization. Define what is auto-acceleration, what causes this effect and how to minimize this effect. Briefly discuss emulsion and suspension polymerization techniques.Discuss the reasons for the differences in glass transition temperature for the following pairs of polymers. Hint: check factors that affect Tg Poly(ethylene oxide) (-41°C) and Poly(vinyl alcohol) (85°C)11c. Nylon 6 and poly(ε-caprolactone) have similar polymer backbone structure with one carbonyl, 5 methylene and a heteroatom, nitrogen or oxygen, respectively. Each is able to undergo crystallization. However, their thermal transition temperature differs significantly. The glass transition temperature (Tg) for Nylon 6 is 52 °C, whereas the Tg for poly(εcaprolactone) is 112 degree lower than Nylon 6 at – 60 °C. Similarly, the melting temperature (Tm) for Nylon 6 is 223 °C, whereas the Tm for poly(εcaprolactone) is 60 °C. Briefly explain the significant differences in the thermal properties of these two polymers.
- Outline some methods for obtaining ultra-high orientation in polymers (e.g. Kevlar).Producing a polymer part whose medium of use will be water at a constant temperature of 90°Cis considered. Dimensional stability is of great importance during the use of this part.As it is stated that; The polymer of the formula below is suitable for such an application.Write down the reasons why ?Sketch and label the expected stress-strain curves at room temperature for lightly cross-linked poly(butadiene) and reinforced poly(methyl methacrylate). Compare the behaviour of each specimen in terms of modulus and toughness.
- Give some idea about -: "Electrospun composite fibers for biomedical applications" Dont try to reject it is problm from polymer chemistry , if possible use some pic to explain thanks much in advanceQuestion 1 a. Briefly describe what is thermoplastic, thermoset plastic and elastomer. Give examples to clarify your answers. b. Briefly discuss the effect of thermodynamic on polymerization. c. What are important factors influencing the properties of polymers? Question 2 a. Discuss the suitable initiator to start an addition polymerization. b. Define what is auto-acceleration, what causes this effect and how to minimize this effect. c. Briefly discuss emulsion and suspension polymerization techniques. Question 3 a. Discuss the differences between condensation and addition polymerization. b. What requirement should be provided to achieve high yield and high molecular weight of polymer by condensation reaction? c. What is interfacial polymerization? Question 4 a. Describe biopolymer and synthetic polymer. Give examples to support your answer b. Briefly discuss the classification of polymers. c. Why polymers are widely used in our daily life? Question 5 a. Describe TWO (2) important…Thermoresponsive polymers: In detail describe the chemical principles of thermal response (why are they thermoresponsive?).
- Sketch portions of a linear polypropylene molecule that are (a) syndiotactic, (b)atactic, and (c) isotactic. Use two-dimensional schematics.Discuss the reasons for the differences in glass transition temperature for the following pairs of polymers. Hint: check factors that affect Tg Poly(ethyl acrylate) (-24°C) and Poly(methyl methacrylate) (105°C)Hello Sir.Good Night. I have a question in my home work related materials polimer lesson. The following below is my question. Please advice, thank you so much. "Explain the working concept of XRD (X-Ray Diffraction) in the polymer characterization process ?"