a-In polymers, why is thermal conductivity different in crystalline regions, compared to non-crystalline (amorphous) region?
b-What is a phonon? How is it related to thermal conductivity?
a-In polymers, why is thermal conductivity different in crystalline regions, compared to non-crystalline (amorphous) region? b-What...
How are crystalline and amorphous polymers different? Write about the properties and applications of any : - Four Crystalline polymers Four Amorphous polymers (7 Marks)
regions in polymers make the polymer flexible. Amorphous O Cross linked O Crystalline O Cross linked and crystalline none of these
Describe the crystalline and amorphous states in thermoplastic and thermosetting polymers. How many transitions do take place in those polymers? Do you think that every polymer type has a melting point? why or why not?
5. 20 pts (A) What are typical values of thermal conductivity and coefficient of thermal expansion for metals and polymers? Metal Ceramic Thermal Conductivity CTE (B) If you heat the metal, what happens to its thermal conductivity, and why (25 words or less) (C) You have 10.0000 cm bars of your typical metal and ceramic from part (5A) at 25.0000 deg C. You heat them both to 300.0000 deg C. What are their lengths upon heating?
A thin rod of radius r, length 3L, and thermal conductivity, k is divided into three regions, each of length L. Regions 1 and 2 are surrounded by a perfectly insulating wall, while Region 3 protrudes into ambient air well-insulated. Uniform heat generation, q, occus only in Region 1 Sketch the temperature prolile along the entire length of the rod. For each region, specify why the temperature prolile has the shape you have decided on. Also, specify the nature of...
QUESTION2 What is common between the plasticity mechanism of semi-cystalline plassic polymers and polycnystalline metalbs? O slips justify both O untangling the amorphous regions justifies polymeric plasticity while slips justity metallic olasticity 0.5 points Save Answer chain orientation justifies polymeric plasticity while the dislocation theory justifies metalic plasticity chanege inthe equaterium distance jesifits both 1 points Save Answer QUESTION 3 Estimate the upper l mit of the eastK modulus of concrete (45 decimal points Elastic modulus of gravel 150 MPa...
Q21. Which one of the following statements about the ductility of metals is TRUE? A High ductility occurs in brittle materials B Ductility is the amount of deformation at the 0.2% proof stress C Ductility can be measured as % reduction in area from broken tensile samples D Ductility is deformation in the elastic region E Ductility is the change between upper and lower yield point in steels Q22. Which one of the following statements is TRUE about Charpy impact...
Your colleague has synthesized two different polymers from the same mer unit, sample A and B. Sample A demonstrates greater strength, lower ductility, and higher softening temperature compared to sample B. Based on this information, compare the following possibilities between the two samples: Degree of branching Degree of crosslinking Number-average molecular weight Degree of polymerization Size of mer side chain Sample A is > Sample B in which of of these aspects? Please also explain why
QUESTION 1 A semi-crystalline nylon with a degree of crystallinity of 25% has a density of 1.5 g/cm^3. Nylon has a crystalline density of 1.8 g/cm^3. What is its amorphous density in grams per centimeters cubed? 1 points QUESTION 2 Which defect is NOT common between metals and polymers? tie molecules vacancies screw dislocations interstitial defects 0.5 points QUESTION 3 Which one is not a characteristic of a plastic polymer? a. Low stress but very large strains b. Tensile strength...
Plz quick help Materials science 4. Spts) Illustrations (A) and (B), below, show two different silicate structheir physical properties: the common name of the structures shown. Then compare and contrast the crystalline or amorphous? How do their melting points (Tm), glass compare. Explain WHY you expect these physical properties to r physical properties: Is each transition temperatures (T), ifany, be the way you have described.