Novel bifunctional initiator for polymerization of 2-oxazolines via fast initiation

Phase-transition characteristics of amphiphilic poly(2-ethyl-2-oxazoline)/poly(?-caprolactone) block copolymers in aqueous solutions

“…18 The hydroxyl groups of PEtOzOOH (M n ϭ 6400) and HOOPEtOzOOH (M n ϭ 3000) were used as the initiation sites for the ring-opening polymerization of -caprolactone in the presence of a catalyst, stannous octoate, to produce the block copolymers, PEtOz-PCL and PCLPEtOz-PCL, respectively. The block copolymers were prepared by the length of the hydrophobic PCL block being varied, whereas the length of the hydrophilic PEtOz block was fixed.…”

How to Modulate the Chemical Structure of Polyoxazolines by Appropriate Functionalization

“…Macroinitiators deriving from cholesteryl56 and vegetable oils, such as castor oil,57 diacylglycerol,56 and 1,2‐ o ‐diooctadecyl‐ sn ‐glyceryl48 are employed in the synthesis of amphiphilic copolymers. The CROP of 2‐oxazoline is also compatible with bis‐initiators bearing unsaturated moieties, like acetylenic groups55, 60 and double bonds 52, 61, 62. Multifunctional initiators based on alkyl chains,61, 63, 64 aromatic rings with two reactive sites in the ortho, meta or para positions52 or six reactive sites65 are used in the elaboration of more‐complex structures.…”

“…The CROP of 2‐oxazoline is also compatible with bis‐initiators bearing unsaturated moieties, like acetylenic groups55, 60 and double bonds 52, 61, 62. Multifunctional initiators based on alkyl chains,61, 63, 64 aromatic rings with two reactive sites in the ortho, meta or para positions52 or six reactive sites65 are used in the elaboration of more‐complex structures. Other multi‐initiators have been described, such as tetrachloro‐ or iodoinitiators from porphyrine 66…”

Molecular weight distribution and endgroup functionality of poly(2-ethyl-2-oxazoline) prepolymers

“…A key to those copolymers, gels or nanostructures is the preparation of polyoxazoline oligomers with controllable molecular weights and good endgroup functionality. Mono- [22,23] and difunctional [24] allyl or benzyl halides have been studied as initiators for poly(2-oxazoline)s. These halides are good electrophiles and many of them are commercially available or easily synthesized. Kobayashi et al [25] reported controlled molecular weight hydroxyfunctional telechelic poly(alkyl oxazoline)s utilizing difunctional allylic or benzylic initiators followed by termination with potassium carbonate.…”