a ) Explain why early transition metal catalysts are most commonly employed in the polymerisation of olefins whilst late transition metal catalysts are often used to prepare oligomeric materials. Illustrate your answer with appropriate examples and include the mechanisms of the reactions involved.
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- (i) Define the criteria for condensation polymerisation to occur. (ii) Give one example of condensation polymer; draw the structure of the repeating unit for this polymer. (iii) Describe the application for the example polymer in your answer of Q4b (ii) above.Outline methods for the production of vinyl polymers using bulk methods. Vinyl polymers are polymers made from vinyl monomers, that is, small molecules containing carbon-carbon double bonds. ... When polymerized, the ethylene molecules are joined along the axes of their double bonds, to form a long chain of many thousands of carbon atoms containing only single bond between atoms.C Metallic Tanta C The Substance C The Substance C The Substance C Which Of The C Get Homewor O 8 https://east.cengagenow.com film/takeAssignment/takeCovalentActivity.do?locator=assignment-take O Other Bookmarks [References) Use the References to access important values if needed for this question. In a study of the rearrangement of cyclopropane to propene at 500 °C (CH2)3 CH3CH=CH2 the concentration of (CH2)3 was followed as a function of time. It was found that a graph of In[(CH2)3] versus time in seconds gave a straight line with a slope of -1.02x10-3 s-1 and a y-intercept of -2.77. Based on this plot, the reaction is Norder in (CH2)3 and the rate constant for the reaction is s-1 zero first Submit Answer Try Another V second item attempts remaining Previnus Next 7:13 PM 5/5/2022 SONY WEB DISPLAY OFF One Touch Web Access Without Booting Up F8 Num Lk Ser Lk Prt Sc Sys Rq Insert Pause Delete Break F4 F5 F6 F7 F9 F10 F11 F12 -Backspace Home
- (b) What type of ionic addition polymerization process would vinyl acetate be expected to undergo? Justify your answer fully.(a) Compound D undergoes a reaction with hydrogen bromide, HBr to produce 2-bromobutane. D exists as cis-trans isomers and decolourises bromine solution in methylene chloride, CH2CI2. Sebatian D mengalami tindak balas dengan hidrogen bromida, HBr untuk menghasilkan 2-bromobutana. D wujud sebagai isomer cis-trans dan memudarkan larutan bromin dalam metilena klorida, CH2CI2. (i) Draw and name the structure of compound D. Lukis dan namakan struktur sebatian D. (ii) Draw two (2) constitutional isomers of compound D. Lukis dua (2) isomer berjuzuk bagi sebatian D.Consider the following series of poly(phenylene oxide) polymers A–D, and their glass transition temperatures. Explain how the differences in structure can account for the differences in Tg
- 5. Which of the following "isomeric" polymers would you expect to exhibit the greater crystallinity? Explain. Chemical Structure and Polymer Morphology 8. Which of the following "isomeric" polymers would you expect to exhibit the greater crystallinity? Expl (a) CH₂CH₂CH- CH₂CH or OCH [EICH, EOCH.CHCH₂Of 9. When poly(tetramethylene adipate) (a polymer of interest for at crinity initially increases surgical sutures) i jected to hydrolytic or enzymatic degradation, the polymer's percent does this suggest about the degradation process? (A.-C. Albertson and O. Ljunquist, J. Macromo Chem., A23, 393, 1986) (b) CH, [ECH). COCH, Jon Of CH₂ (c) -CH₂CF₂ or or -CHFCHF- 10. One method of determining percent crystallinity in a polymer involves inverse gas chromatograph is, the polymer in question is used as the stationary liquid phase coated on the column packing. SpDiscuss mechanism of conductin in conducting polymers. The answe should be in more than two pages . Show structurespolystyrene vs polyethylene I need to compare the mechanical and thermal properties of polystyrene obtained by catonic catalysis of styrene, and compare them with polyethylene obtained by metallocene catalysis.
- (a)How to make a specific polymer conductive? Explain with suitable example and mechanisms.Producing a polymer part whose medium of use will be water at a constant temperature of 90°Cis considered. Dimensional stability is of great importance during the use of this part.As it is stated that; The polymer of the formula below is suitable for such an application.Write down the reasons why ?(a) State the type of defect shown below. Note that a perfect stacking sequence in this FCC crystal would be ABCABCABC..., from bottom to top. |< │0│P│0 │<│0│p < | (b) Show how this defect can be produced by the glide of partial dislocations through a perfect crystal.