Poly segmented

Zhu L.L. and Wegner G. The morphology of semicrystalUne segmented poly(ether ester) thermoplastic elastomers, Macromol. Chem., 182, 3625, 1981. 

Fakirov S, Apostolov AA, Boeseke P, and Zachmann HG. Structure of segmented poly(ether ester)s as revealed by synchrotron radiation. J Macromol Sd Phys, 1990, B29(4), 379-395. 

Deschamps AA, Clause MB, Sleijster WJ, Bruijn JD, Grijpma DW, and Feijen J. Design of segmented poly(ether ester) materials and structures for the tissue engineering of bone. J Control Rel, 2002, 78, 175-186. 

McGrath, /. E, Dunson, A L., Hedrick,l L.i Synthesis and Characterization of Segmented Poly-imide-Polyorganosiloxane Copolymers. Vol. 140, pp. 61-106. 

Segmented Poly(ether urethane) Filins Containing Ferrocene Units in the Hard Segments... 

Segmented poly(ether urethanes) were synthesized from polypropylene glycol (PPG) and 4,4 methylene-bis(phenyl-isocyanate) (MDI), using l,l -bis(B-aminoethyl)ferrocene (1) and 1,1 -bis(B-hydroxyethyl)-ferrocene (2) as chain extenders. 

Santos et al. [128,129] and Guerrero et al. [130] prepared segmented poly(EO) containing bistrialkylbenzopinacolate moieties to synthesize poly(St)-poly(EO) block copolymers. The St polymerization with the polymeric iniferter 27 was comparable to that initiated with small molecular benzopinacolates. 

JM Oberski, KU Clauswitz, G Liissem, F Geffarth, JH Wendorff, and A Greiner, Emission of polarized light from liquid cystalline segmented poly(arylenevinylene)s, Macromol. Symp., 154 235-244, 2000. 

Sheth JP, Wilkes GL, Fornof AR, Long TE, Yilgor I. Probing the hard segment phase coimec-tivity and percolation in model segmented poly(urethane urea) copolymers. Mactomolecules 2005 38 5681-5685. 

Biomer is a commercially available, medical grade segmented poly(ether urethane urea) (PEUU), which is prepared by treating an isocyanate-capped polyetherurethane with diamine (e.g. ethylenediamine) as chain extender... 

Thus, N-pyrimidine phthalimide reacted with hexylamine at room temperature to form an amide-amide. The initial amide-amide formation proceeded more rapidly in chloroform as compared to dimethylsulfoxide (DM SO). However, the ring closure reaction to the imide was favored by the more polar, aprotic DMSO solvent, yielding the imide in nearly quantitative yield after 3 hours at 75 °C. The authors were able to utilize this synthetic approach to prepare well-defined segmented poly(imide-siloxane) block copolymers. It appears that transimidi-zation reactions are a viable approach to preparing polyimides, given that the final polyimide has a Tg sufficiently low to allow extended excursions above the Tg to facilitate reaction without thermal decomposition. Additionally, soluble polyimides can be readily prepared by this approach. Ultimately, high Tg, insoluble polyimides are still only accessable via traditional soluble precursor routes. 

Fig. 21 a Schematic of a linear segmented poly(N-isopropylacrylamide-seg-styrene) (PNIPAM-seg-St) coplymer chain prepared by micelle copolymerization, in which short PS segments are relatively evenly distributed on the chain backbone, b Schematic of the adsorption of a linear PNIPAM-seg-PS chain on a hydrophobic PS substrate in water [97]... 

The series of ten different segmented poly(ester-urethane)s obtained was characterized by SEC (molecular weight, polydispersity), DMA (thermo-mechanical properties), DSC (thermal properties) and Instron (mechanical properties). Before the mechanical testing could be performed, it was necessary to establish procedures for film production. 

Takakura et al. [82] investigated on the structure and the mechanical properties of fluorinated segmented poly(urethaneurea)s, showed that their structures were highly ordered and such polymers behaved as elastomers. 

Yoon [83] studied by X-ray photoelectron spectroscopy the surface structure of segmented poly(ether urethane)s and poly(ether urethane urea)s with various perfluorinated chain extenders and noticed that the surface topography of such polymers depended strongly on the extent of phase separation. 

Figure 5. The change in dynamic viscosity of Halthane 87-1 segmented poly(urea-urethane) adhesive with time increases dramatically with temperature. Since the initial viscosity decreases with temperature, the plot cross through each other.

The monomers 26 and 27 have also been used to synthesize segmented poly(ether urethane) from poly (propylene glycol) (PPG) and 4,4 -methylene-bis(phenyliso-cyanate) (MDI) [37]. In the prepolymer method employed, MDI (2 equiv.) and PPG (1 equiv.) were allowed to react at 60 °C in the presence of 1 mol% dibutyltin... 

Fig. 14. Apparent weight distributions calculated from the translational diffusion coefficient distributions corresponding to low-mass (O) and high-mass ( ) copolymer segmented poly(ethylene terephthalate-co-caprolactone) (PET-PCL) containing 13% PET in tetrahydrofuran (THF) at 25 °C...

SdM- tate Extrusion of Segmented Poly(ether ester)s... 

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