What would the weight average molecular weight of the sample be if, we had filtered the monomer mixture with a 44 kDa dialysistubing before preparation? (Hint: a dialysis tubing of a known molecular weight, only keeps molecules larger than that size)(This question has only one correct answer)O a.Mw = 61,506O b.Mw = 73,407О с.Mw = 44,908O d.Mw = 70,750O e.Mw = 65,504 An unknown polymer sample was found to have the following molecular weight distribution:Molecular weight rangeXiWi8,000 – 20,0000.050.0220,000 – 32,0000.150.0832,000 – 44,0000.210.1744,000 – 56,0000.280.2956,000 – 68,0000.180.2368,000 – 80,0000.100.1680,000 - 92,0000.030.05What would the weight average molecular weight of the sample be if, we had filtered the monomer mixture with a 44 kDa dialysistubing before preparation? (Hint: a dialysis tubing of a known molecular weight, only keeps molecules larger than that size)

Consider the given data and calculate the mean molecular weight.

What would the weight average molecular weight of the sample be if, we had filtered the monomer mixture with a 44 kDa dialysis tubing before preparation? (Hint: a dialysis tubing of a known molecular weight, only keeps molecules larger than that size)

What would the weight average molecular weight of the sample be if, we had filtered the monomer mixture with a 44 kDa dialysis tubing before preparation? (Hint: a dialysis tubing of a known molecular weight, only keeps molecules larger than that size)

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

See similar textbooks

Similar questions

8.42) Briefly explain how each of the following influences the tensile modulus of a semicrys- talline polymer and why: (a) molecular weight; (b) degree of crystallinity: (c) deformation by drawing; (d) annealing of an undeformed material; (e) annealing of a drawn material.
Determine whether the first part of statement will INCREASE, DECREASE or have NO EFFECT in the second part of the statement. 1. If there is an increase in karat of gold, the strength will ______. 2. If there is an increase in crosslink of a linear polymer, then the degree of amorphousness will _____. 3. If there is an increase in polar groups, then the degree iof polymerization will _____.
Which of the following is correct regarding the degree of crystallinity of semi-crystalline polymers? Semi-crystalline polymers are heat treated to increase the crystallinity and improve polymer strength The tendency of a polymer to crystallize increases with increasing molecular weight Degree of crystallinity and tendency to creep have an inverse relationship Increasing the degree of crystallinity generally increases polymer strength, elastic modulus and ductility in semi-crystalline polymers
a) List down the four molecular structures for polymers. Discuss in detail how the four molecular structures affect the level of strength of the resulting polymers according to their order. b) Define composites. Describe the phase present in composites. With time,the use of composite in aircraft body has increased to 50% discuss the advantages of composites as compared to conventional materials in aerospace industry c) List down one processing method for production of composite tubes made of fiber reinforced polymer.Briefly describe the processing steps involved.
When a polymer takes on a crystalline structure, its density, stiffness, and melting temperature decrease. T or F
Which of the following are incorrect regarding the crystallinity and mechanical behavior of polymers? a. As temperature is reduced, necking behavior of plastic tensile bars completely disappears b. Semi-crystalline polymers are heat treated to increase crystallinity and improve strength c. Heat treatment always results in enhanced polymer strength, modulus, and brittleness d. Strain softening happens in elastomers where the deformation gradually leads to a decrease in stiffness under constant strain rate e. Increasing the degree of crystallinity generally increases polymer strength, elastic modulus, and ductility in semi-crystalline polymers f. The stress-strain curve slope for totally elastic and brittle polymers is always positive
Answer the followings mcqs a)Prepreg formation results in Tape consisting of randomly oriented fibers Sheet consisting of randomly oriented fibers Tape consisting of continuous aligned fibers Sheet consisting of continuous aligned fibers b) In injection molding of thermoplastic composites: Screw is straight and barrel is cold Screw is tapered and barrel is heated Screw is tapered and barrel is cold Screw is straight and barrel is heated c) Starting laminates for compression molding process is: Sheet molding compound Bulk molding compound Both (a) and (b) Prepreg
Q#04 (a) : What are composite materials? Discuss the functions of Re-inforcing agent and matrix materials. (b) : Name different types of advanced fibres.
Use the graph depicting specific volume versus temperature for polymers to answer the following question.: Identify the curve that exhibits both a definitive glass transition temperature and melting temperature. Group of answer choices Curve A Curve B Curve C
119) fiber orientation in composite material is (which)I. one-dimensional continuous fibersII. planar continuous fibers in the form of woven fabricIII. random discontinuous fibersA. only IB. I AND IIC. All of them D.II and III 121) Between the phases of the composite material, intermediate and intermediate phases are like which of the following?A. Direct adhesion between primary and secondary phasesB. Interphase formation between primary and secondary phases by addition of third component for adhesionC. Formation of interphase by dissolving primary and secondary gases at their own boundariesA. A and cB. Only aC. only cD.B.E. All
Which statement is correct regarding the structure of polymers? a. Increasing the degree of crystallinity generally increases polymer strength, elastic modulus, and ductility in semi-crystalline polymers b. Amorphous & semi-crystalline polymers have lower strength than crystalline polymers c. Semi-crystalline polymers are heat treated to increase the crystallinity and improve polymer strength d. The tendency of a polymer to crystallize increases with increasing molecular weight e. Strength increases at higher temperatures as the material softens f. It is desirable to have a ductile-to-brittle transition temperature below room temperature g. Degree of crystallinity and elongation at break have an inverse relationship
Q1) What does it mean when we say composites are notch sensitive? Q2) What are the differences between the static strength in metallic and composite structures? Q3) How is the fatigue behavior different between composite and metallic structures? Q4) Why do we need orthotropic analysis for composite laminates? Q5) What are "kink-band" failure modes? Q6) How does moisture impact tension and compression strength in composites? Q7) What is the difference between a design value and an allowable and how does variability in material properties impact this behavior?