02014nas a2200181   4500008004100000022001400041245011800055210006900173260007100242300001400313490000700327520130200334100001801636700001801654700001601672700001701688856012701705       2012                        eng d  a0024-929700aReactive polymers bearing styrene pendants through selective anionic polymerization of 4-vinylbenzyl methacrylate0 aReactive polymers bearing styrene pendants through selective ani  a1155 16TH ST, NW, WASHINGTON, DC 20036 USAbAMER CHEMICAL SOCcAPR  a3387-33930 v453 a<p>Selective anionic polymerization of 4-vinylbenzyl methacrylate at methacrylate site has been achieved using resonance stabilized anionic initiators such as 1,1-diphenylhexyllithium (DPHLi) and tritylpotassium (TritylK) in tetrahydrofuran (THF) at -78 degrees C. Polymerization proceeded selectively through methacrylate functionality of the monomer in a controlled manner and produced polymers and copolymers with narrow molecular weight distribution at low temperatures (&lt;=-40 degrees C). H-1 NMR of the polymer showed the presence of styrene pendants in every monomeric repeating unit. The polymerization results confirm that the resonance stabilized carbanions with an optimum pK(a) (30 &lt;= pK(a) &lt;= 32) of their conjugate acids such as DPHLi and TritylK do not react with styrene functionality at 78 degrees C. The selective initiation without cross-linking is attributed to the differences in the electronegativity between polar methacrylate and styrene functionalities and an attenuation of initiator reactivity at low temperature. Poly(4-vinylbenzyl methacrylate) and its copolymers with the vinyl pendant in close proximity with ester linkage are very reactive and unstable, readily undergoing cross-linking in solution or in solid state with or without a radical initiator.</p>1 aMohan, Murali1 aRaghunadh, V.1 aSivaram, S.1 aBaskaran, D.  uhttps://library.ncl.res.in/content/reactive-polymers-bearing-styrene-pendants-through-selective-anionic-polymerization-4-0