2 Responses to “Lithium Polymer”

1. nupoptoxy
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2. Bernard
   November 10th, 2011 @ 5:44 am

   1) During a step growth polymerisation: (also mention what would happen for an addition polymerisation please)
   a) Monomer disappears early in the reaction

   (for an addition polymerisation (b) would be true)

   2)A co polymer can be found by:
   c) Polymerising two different monomers

   3) The effect of chain transfer reagents is to:
   c) Reduce average degree of polymerisation.

   4) In ionic polymerisation "living Polymer" is formed when;
   b) termination reactions do not occur

   5) If Styrene monomers is polymerised under anionic conditions using butyl lithium as the initiator then,
   a) The rate of polymerisation is faster in a polar solvent than a non polar solvent.

   6) Atactic polypropylene has methyl groups place: (also tell what will be for isotactic polypropylene)
   b) Randomly about the polymer backbone

   Also:
   a) Alternately about the polymer backbone – syndiotactic
   c) On the same side of the polymer backbone – isotactic

   7) Infrared spectroscopy gives information about:
   b) bond vibrations

   The absorption peaks ina an infrared spectrum are broad because they contain information related to:
   d) Bond energy

   10) The free radical polymerisation, inhibitors;
   d) stop the formation of free radicals.

   11) Isotactic polypropylene can be synthesised by:
   b) coordination polymerisation

   This last set of answers doesn't make sense – it isn't (a) or (b), but answers (c) and (d) don't seem to belong with the question! PMMA is a water insoluble homopolymer.
   12) Poly(methylmethacrylate) (pmma) is an example of;
   a) an AB block co polymer
   b) a water soluble polymer
   c) their glass freezing temperature
   d) their glass boiling temperature.