Which statement is correct regarding the structure of polymers? Oa. Degree of crystallinity and elongation at break have an inverse relationship Ob. Strength increases at higher temperatures as the material softens O c. The tendency of a polymer to crystallize increases with increasing molecular weight O d. Semi-crystalline polymers are heat treated to increase the crystallinity and improve polymer strength Oe. Amorphous & semi-crystalline polymers have lower strength than crystalline polymers Of. Increasing the degree of crystallinity generally increases polymer strength, elastic modulus, and ductility in semi-crystalline Og. It is desirable to have a ductile-to-brittle transition temperature below room temperature

Which statement is correct regarding the structure of polymers? Oa. Degree of crystallinity and elongation at break have an inverse relationship Ob. Strength increases at higher temperatures as the material softens O c. The tendency of a polymer to crystallize increases with increasing molecular weight O d. Semi-crystalline polymers are heat treated to increase the crystallinity and improve polymer strength Oe. Amorphous & semi-crystalline polymers have lower strength than crystalline polymers Of. Increasing the degree of crystallinity generally increases polymer strength, elastic modulus, and ductility in semi-crystalline Og. It is desirable to have a ductile-to-brittle transition temperature below room temperature

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

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Polymers C and D have the same chemical composition, but Polymer C has a 40% greater weight- average molecular weight (M. ) than Polymer D. Which of the following statements is likely true? It is impossible to predict based on the information given Polymer C will have a higher yield strength than Polymer D Polymers C and D will have similar yield strengths since the molecular weight does not affect strength Polymer D will have a higher yield strength than Polymer C
Q4:- Compare between thermoplastic and thermosetting polymers.
Answer whats in the image, please and thank you
Compression molding is a manufacturing process in which the molding material is preheated then placed in an open mold cavity where the compressive action of the punch forces the polymer into the desired shape as shown in the figure below. Based on your understanding of the behavior of polymers, which of the statements below regarding compression molding of polymers are accurate? Punch Cavity C. -Upper mold half Charge 41 (1) -Lower mold half Knock-out pin V, F |x.F (2) and (3) Molded part a. Lower operating temperatures are more desirable as they reduce viscosity making it easier to fill the cavity b. This process can only be used for thermosets as they can thermally cure from monomer state This process can be used for both thermosets and thermoplastics as they can both be thermally shaped d. This process is suitable for rubber, PVC and polymethyl methacrylate
Silica gels are a form of SiO2 characterized by: (This question has more than one correct answer) a. Crystalline lattice b. High internal surface area c. Presence of OH ions d. Can be used as a catalyst support
d) A number of [0]s and [0,90]s CFRP test specimens were made from prepreg material with the following properties: Fibre strength, of = 3250 MPa Fibre modulus, E₁ = 195 GPa Matrix strength, m = 35 MPa Matrix modulus, Em = 3.8 GPa Volume fraction of fibres, Vf = 0.65 Calculate the tensile strength, oc, and the tensile modulus, Ec, in the 0° and 90° directions, using the simple "rule of mixtures" approach for both the [0]s and [0,90]s specimens.
The answer is one of the options below please solve carefully and circle the correct option Please write clear .
Molecular weight data for some polymer are tabulated here. Compute (a) the number-average molecular weight, (b) the weight-average molecular weight. (c) If it is known that this material's degree of polymerization is 710, which one of the polymers listed in Table 14.3 is this polymer? Why? Molecular Weight Range g/mol 15,000-30,000 Xi Wi 0.04 0.01 30,000-45,000 0.07 0.04 45,000-60,000 0.16 0.11 60,000-75,000 0.26 0.24 75,000-90,000 0.24 0.27 90,000 105,000 0.12 0.16 105,000-120,000 0.08 0.12 120,000-135,000 0.03 0.05