Webgave a percentage crystallinity of 45% and X-rays indicated 30% crystallinity. Explain these differences. 18) Percentage crystallinity of a polymer sample was measured by DSC (75%), X-Ray (63%) and Density Gradient Column (72%). Which is the correct value. 19) Two scientists decided to swap samples of the same polymer supposedly WebThe deflection temperature is the temperature at which a test bar, loaded to the specified bending stress, deflects by 0.010 inch (0.25 mm). The value obtained for a specific polymer grade will depend on the base resin and on the presence of reinforcing agents. Deflection temperatures of glass fiber or carbon fiber reinforced engineering ...
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WebJul 6, 2024 · In a polymer sample, 30% of molecules have a molecular mass of 20,000, 40% have 30,000 and the rest 60,000. What is the weight average molecular mass of the … WebApr 14, 2024 · Rationale: Pneumococcal pneumonia remains a global health problem. Pneumococcal colonisation increases local and systemic protective immunity, suggesting nasal administration of live attenuated S. pneumoniae strains could help prevent infections. Objectives: We used a controlled human infection model to investigate whether …
WebThis discussion on In a polymer sample, 30% of molecules have a molecular mass of 20,000, 40% have 30,000 and th erest 60,000. What is the weight average molecular mass of the polymer? a)40,3000 b)30,6000 c)43,333 d)50,400Correct answer is option 'C'. Web7.7 An ABS copolymer consists of 25 wt % polyacrylonitrile, 30 wt % polybutadiene, and 45 wt % polystyrene. Calculate the mole fraction of each component in this material. Using a basis of 100 g of copolymer, we have 25 g of polyacrylonitrile, 30 g of polybutadiene, and 45 g of polystyrene. The corresponding number of moles of each component is:
WebIn a polymer sample 30% of molecules have a molecular mass of 20,000, 40% have 30,000 and the rest 60,000. What is the weight average molecular mass of the polymer? A. 40,300. B. 30,600. C. 43,333. D. 50,400. Medium. Open in … WebSep 7, 2024 · All polymers exhibit no strength below DP = 30. The strength also does not change much above DP's in the 600 range. As the chains become very long, molecular …
WebStep-by-step solution 100% (63 ratings) for this solution Step 1 of 5 (a) Calculate the mean as follows: If molecular weight is ranging from 8000 to 20000, the mean is calculated as follows: Chapter 14, Problem 6QP is solved. View this answer View a sample solution Step 2 of 5 Step 3 of 5 Step 4 of 5 Step 5 of 5 Back to top Corresponding textbook
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