(iii) The molecular weight of polydimethylsiloxane can be controlled by addition ofa silicon-based reagent. Suggest the identity of this reagent and explain itseffect on the polymerisation reaction.(iv) The properties of polydimethylsiloxane can be changed by the altering thedegree of branching of the polymer chains. A silicon-based reagent can beadded to promote chain branching during polymerisation. Suggest the identityof this reagent and explain how it promotes chain branching.

Answered: (iii) The molecular weight of…

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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(a)Is this a condensation or addition polymer? Explain how you know. (b) Provide the IUPAC name of the monomer that does not contain the benzene group.
Draw the structure of the polymer that results from anionic polymerization of p-trichloromethylstyrene (CCl3C6H4CH =CH2) using ethylene oxide as the electrophile to terminate the chain.
One common type of cation exchange resin is prepared by polymerization of a mixture containing styrene and 1,4-divinylbenzene . The polymer is then treated with concentrated sulfuric acid to sulfonate a majority of the aromatic rings in the polymer. Q.) Show the product of sulfonation of each benzene ring.
Draw the structure of the following polymers and indicate the polymerization type responsible for the givenpolymers.Indicate, where appropriate, the polyester, polyamide or polyurethane linkages.a) Poly(ethene terephthalate)b) Poly(vinyl alcohol)c) Polyisoprene and isomer structures of polyisoprened) Poly(methyl methacrylate)e) Polycaprolactam
Polystyrene is a synthetic aromatic hydrocarbon polymer made from the monomer known as styrene. H H H Polystyrene (i) Draw the structure of styrene. Outline the mechanism when styrene reacts with HCl, following (ii) Markovnikov's rule.
Please help me with the following Organic Chemistry question. Please give explanation where necessary.
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Olefin polymerization is responsible for producing over 100 million tons per year of plastic material. (a) Briefly describe the type of catalysts used in the transition metal catalysed homogeneous polymerization reactions. (b) How are the catalysts activated? (c) Draw the active catalyst, and indicate how the polymer chain is propagated. (d) Suggest a possible chain termination step. (e) Certain single-site catalysts are capable of selectively forming different types of polypropylene. Describe these different types of polymer, and the characteristics of the catalysts that form them.
2. Draw a section of the chain (four or five repeating units) of each of the following head-to-tail polymers: (a) syndiotactic poly(vinyl alcohol) isotactic poly(a-methylstyrene) (b) atactic 1,2-polybutadiene syndiotactic poly(1,2-difluoroethylene) (c) (d)
2)

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