Macromonomer, oxazoline terminated

Interestingly, we can mention the oxazoline-terminated PS macromonomers [335], obtained by ATRP in the presence of initiators 9 and lOin Scheme 71. 

End-functionalized polyethylene (PE) [8, 9], polypropylene (PP) [10], and polyisobutylene (PIB) [11] have been transformed to their corresponding macromonomers carrying (meth)acrylate, oxazoline, and methacrylate end groups, 1, 2, and 3, respectively. Polybutadienyl lithium was terminated with chlo-rodimethylsilane, followed by hydrogenation to saturated polyolefin (PHBd) [12]. Hydrosilylation of the end silane with allyl glycidyl ether afforded an epox-... 

Macromonomers were prepared by polymerizing oxazolines with monofunctional initiators (e.g., methyl p-toluenosulfonate) and terminating the polymerization with salts of acrylic or methacrylic acid. Macromonomers with M varying from M — 500 to —2500 and MJM - 1.2-1.4 were obtained functionalities, however, depended strongly on reaction conditions and the values between 0.99 down to —0.5 and lower were reported [280]. 

Alkyl-2-oxazoline macromonomers were prepared by termination of the living polymers with diethanolamine [ 181 ] as illustrated in the following reactions (Scheme 49). 

Poly(2-alkyl oxazoline)s having methacrylate or acrylate end groups were prepared by two methods [182]. a) Living polyoxazoline chains, prepared using methyl p-toluene sulphonate as initiator, were end-capped by reaction with metal salts or tetraalkylammonium salts of acrylic or methacrylic acid or a trialky-lammonium salt or trimethylsilyl ester of methacrylic acid (functional termination). b) The living polymers were terminated with water in the presence of Na2C03 to provide hydroxyl-terminated chains. Subsequent acylation with acry-loyl or methacryloyl chloride in the presence of triethylamine led to the formation of the macromonomers. The procedures are outlined in the following Scheme 51. 

Polymerization of macromonomers by cationic ring-opening polymerization Macromonomer has been prepared from 2-(p-hydroxyphenyl)-2-oxazoline and ethylene oxide using n-butyl lithium to initiate the anionic polymerization of EO 16I). The living chains were terminated with CH3I or H20 yielding macromonomers with Mn = 1,010 and M = 1,930, respectively ... 

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