Ethylene glycol segments

Harada A, Kataoka K. Formation of polyion complex micelles in an aqueous milieu from a pair of oppositely-charged block copolymers with poly(ethylene glycol) segments. Macromolecules 1995 28 5294-5299. 

Unlike conventional, one-headed amphiphiles which can readily slither into vesicle membranes as single chains, bolaamphiphiles can only insert themselves into a preformed membrane in the form of loops (Figure 4.19). Bolaamphiphiles with stiff ethylene glycol segments tend to disrupt vesicle membranes and are extremely effective in releasing entrapped dyes, e.g. 5(6)-carboxyfluore-scein. ... 

S.C.I. Bartolozzi, Multiblock polyurethanes based on biodegradable amphiphilic poly(e-caprolactone)/poly(ethylene glycol) segments as candidates for tissue engineering applications, Nanobiomedicine Eng., 3 (2), 84-92,2011. 

Zhang, Y., et ai, The influence of soft segment length on the properties of polyfbutylene terephthalate-co-succinate)-b-poly(ethylene glycol) segmented random copolymers. European Polymer journal, 40(7) p. 1297. 2004. 

Zhang, Y, Z.G. Feng, and A.Y Zhang, Synthesis and characterization of polyfbutylene terephthalate)-co-poly(butylenesuccinate)-block-poly(ethylene glycol) segmented block copolymers. Polymer International, 52(8) p. 1351. 2003. 

Fig. 1.15 TEM micrographs of the amphiphilic LC-coil diblock copolymers with a defined length of a flexible poly(ethylene glycol) segment as the hydrophilic coil, prepared by the ATRP method. PEG blocks exhibit as cylinders and/or spheres with a width/diameter about 2-3 nm dispersed into the LC matrix PEG block appeared as dark and the solid lines in a, b, and c represent the domain boundaries (Reprinted with permission fiom Tian et al. [195], Copyright 2009 American Chemical Society)...

Schulze U and Schmidt H W (1998) Synthesis and characterization of ABA-triblock copolymers with poly(ethylene glycol) segments and LC-segments, Polym Bull 40 159-166. 

Zhurkov et al. [42] derived the degree of chain orientation from the dichroism of deformed-IR bands of PETP (cf. Chapter SIB and Fig. 8.5) they observed that for highly stressed segments an initial orientation with cos d = 0.75 had turned into practically complete orientation (cos — 1.0). The problems posed by an application of this method are discussed in detail by Read et al. [43]. Bouriot [44] deduced from IR measurements a reversible cis-trans transformation of the ethylene glycol segment in PETP fibers under the effect of tensile stresses. In polyamide 66 he observed a reversible increase of free (non-assodated) NH groups and an increase in the average chain orientation with chain tension. 

---