Which of the following statements are true? a) all polymers have a crystalline melting point b) all polymers have a glass transition c) the glass transition is a first order transition that occurs at a well defined temperature d) the crystalline melting point is not affected by the presence of solvent.

Which of the following statements are true? a) all polymers have a crystalline melting point b) all polymers have a glass transition c) the glass transition is a first order transition that occurs at a well defined temperature d) the crystalline melting point is not affected by the presence of solvent.

Principles of Modern Chemistry

8th Edition

ISBN:9781305079113

Author:David W. Oxtoby, H. Pat Gillis, Laurie J. Butler

Publisher:David W. Oxtoby, H. Pat Gillis, Laurie J. Butler

Chapter21: Structure And Bonding In Solids

Section: Chapter Questions

Problem 18P

See similar textbooks

Similar questions

Briefly discuss the effect of thermodynamic on polymerization.
Which of the following is not an optical property of solid materials? Single choice. a. Polarization b. Transmittance c. Response to magnetic field d. Absorption e. All of the above are optical properties of solid materials
12. What is the main factor in not observing the glass transition behavior in highly cross-linked and highly crystalline polymeric materials?
POLYMER CHEMISTRY - 1. Briefly describe what is thermoplastic, thermoset plastic and elastomer. Give examples to clarify your answers. 2. Briefly discuss the effect of thermodynamic on polymerization. 3. What are important factors influencing the properties of polymers?
Platinum nanoparticles of diameter ∼2 nm are importantcatalysts in carbon monoxide oxidation to carbondioxide. Platinum crystallizes in a face-centered cubicarrangement with an edge length of 3.924 Å. (a) Estimatehow many platinum atoms would fit into a 2.0-nmsphere; the volume of a sphere is (4/3)π r3. Recall that1 A° = 1 x 10-10 m and 1 nm = 1 x 10-9 m. (b) Estimatehow many platinum atoms are on the surface of a 2.0-nmPt sphere, using the surface area of a sphere (4π r2) andassuming that the “footprint” of one Pt atom can be estimatedfrom its atomic diameter of 2.8 A° . (c) Using yourresults from (a) and (b), calculate the percentage of Pt atomsthat are on the surface of a 2.0-nm nanoparticle. (d)Repeat these calculations for a 5.0-nm platinum nanoparticle.(e) Which size of nanoparticle would you expect tobe more catalytically active and why?
What effect does the presence of an α-Methyl group in a polymer chain have on the glass transition temperature?Explain with examples ?
what is floor temperature in thermodynamics of polymerization with the explaination of floor temperature corelatted with polymers
In an x-ray diffraction measurement of BCC Nb, the observed angle (2Θ) for the (211) set of planes occurs at 75.90 degrees (1st order) and a monochromatic x-ray source at λ = 0.1659 nm is used. Compute:a) the interplanar spacing of the (211) set of planes,b) the atomic radius of Nb,c) the anticipated 1st order observed angle (2Θ) for the (111) lattice planes in Nb.d) Estimate the relative intensities observed for the (211) and the (111) diffraction peaks in Nb. Describe your reasoning.
What is the coordination number in the cesium chloride cubic structure?
What is the coordination number of a chromium atom in the body-centered cubic structure of chromium?
When the polymers are evaluated in terms of light transmittance (transparency-transparency); generallyUnder normal conditions, amorphous polymers are transparent, while crystalline polymers are opaque.It is known to be impermeable. However, the opposite situation is also encountered, that is, amorphous. structured polymers behave opaque while crystalline polymers can behave transparent is seen. Explain the reasons for this with examples.
The surface energy of a single crystal depends on crystallographic orientation. Does this surface energy increase or decrease with an increase in planar density? Why?