Synthetic materials can be used by humans for many daily activities. These are often made from natural resources Choose all of the items from the list that are synthetic materials made from natural resources. nylon cotton Kevlar vests sucrose sucralose plastic Matter and Its ln 53°F Sunny ere to search

Synthetic materials can be used by humans for many daily activities. These are often made from natural resources Choose all of the items from the list that are synthetic materials made from natural resources. nylon cotton Kevlar vests sucrose sucralose plastic Matter and Its ln 53°F Sunny ere to search

Chemistry: Principles and Reactions

8th Edition

ISBN:9781305079373

Author:William L. Masterton, Cecile N. Hurley

Publisher:William L. Masterton, Cecile N. Hurley

Chapter23: Organic Polymers, Natural And Synthetic

Section: Chapter Questions

Problem 49QAP

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Show the universal recycling codes to the learners. Or hang a poster of the codes in the classroom for the learners to examine. Ask the learners to bring a plastic product with any of the recycling code listed below. Ask them to describe the material: 1. What is the sample polymer material used for? 2. What recycling code is printed on the sample? 3. Describe the material in terms of hardness and/or flexibility. 4. Why are recycling codes used in the plastic materials?
What processing method would you use to make large, hollow polyethylene playground items? Describe the injection moulding process and distinguish between the injection moulding of TP and TS polymers. 34. Distinguish between electrostatic and electrophoretic coating
Calculate the approximate length of PVA strand assuming that each monomer unit contributes two carbon atom diameters to the length. (1 carbon atom diameter = 154 picometers) Calculate and compare the number of strands of PVA in 1.00 L of 4% PVA and the number of tetrahydroxyborate ions in 1.00 L a 4% solution of borax.
Why does a solid form at the interface of the two solutions? PROCEDURESynthesis of NylonIn a small beaker dissolve ~ 0.5 mL of sebacoyl chloride in 12 mL of ether. In a smalltest tube get ~ 6 mL (~1/4 of a 6 “ test tube) of 1,6-diaminohexane solution in water.In order to form the good polymer fibers, it is best to not mix the solutions. Youshould try to layer one solution on top of the other. First pour the 1,6-diaminohexanesolution into a 100 mL beaker. Then slowly pour the sebacoyl chloride down the sideof the tilted beaker with minimal mixing. At this point you should see two distinctlayers with a white film at the interface. Hook the nylon which forms at the interfacewith a straightened paper clip and pull slowly straight up as high as possible. Thenwrap it around your large beaker and then continue to wind the polymer around tillthe reaction is complete. Rinse your polymer in DI water to remove any salts or acidthat may be present.Weigh your product and characterize it by…
What aspect of thermoset polymers can be controlled to increase strength?
What are impurity defects?
Question 1 a. Briefly describe what is thermoplastic, thermoset plastic and elastomer. Give examples to clarify your answers. b. Briefly discuss the effect of thermodynamic on polymerization. c. What are important factors influencing the properties of polymers? Question 2 a. Discuss the suitable initiator to start an addition polymerization. b. Define what is auto-acceleration, what causes this effect and how to minimize this effect. c. Briefly discuss emulsion and suspension polymerization techniques. Question 3 a. Discuss the differences between condensation and addition polymerization. b. What requirement should be provided to achieve high yield and high molecular weight of polymer by condensation reaction? c. What is interfacial polymerization? Question 4 a. Describe biopolymer and synthetic polymer. Give examples to support your answer b. Briefly discuss the classification of polymers. c. Why polymers are widely used in our daily life? Question 5 a. Describe TWO (2) important…
Why PEEK polymer cannot be melt-processed with another polymer? To make a proper strand?
new synthetic fibres in the last 15 years in the fibre industry? their chemistry their usuage
draw monomer(s) of plastic seat cushions
The fibres in a fibre composite material control: a.)The physical properties of the composite b.)The mechanical properties of the composite c.)Both a.) and b.) d.)The reaction of the resin to the nevironment
Crud Chemicals is producing a casting resin that can be made using either (i) AA and BB monomers or (ii) an AB-type monomer {A & B represent different functional groups, like alcohol and carboxylic acids). A catalyst is added to promote polymerization in the mold. The material has many useful properties, but is deficient in heat and solvent resistance. A proposal is made to improve heat and solvent resistance by adding a tetrafunctional monomer (A4) to the mix to provide crosslinks. Unfortunately, no one in-house knows if this will work, or if the added A4 will form a gel, so they call you in as a consultant. Evaluate their idea to use A4 as a crosslinking agent for both types of polymerizations (i and ii).

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