Preparation via ring-opening polymerization

Narrow-polydispersity cydic poly(caprolactone) was synthesized by cyclization of linear precursors prepared via ring-opening polymerization bom an azido-functionalized initiator, followed by end-group modification to attach a terminal alkyne. Click coupling afforded the cyclic polymer in high... 

The polynorbornenes X bearing cyclotriphosphazenes with -0(CH2CH20)x-CH3 (x=l, 2,3,7.2) side groups have been prepared via ring opening metathesis polymerization (ROMP) and complexed with LiS03Cp3 and LiN(S02Cp3)2 (10-60% molar ratios) by Allcock [619,620]. 

Much better results were obtained when dendronized structures were prepared via ring opening metathesis polymerization (ROMP) of norbornene... 

Brunelle, D. J., Bradt, J. E., Serth-Guzzo, J., Takekoshi, T., Evans, T. L. and Pearce, E. J., Semicrystalline polymers via ring-opening polymerization preparation and polymerization of alkylene phthalate cyclic oligomers, Macromolecules, 31, 4782 (1998). 

B. Mayr, F. Sinner, and M.R. Buchmeiser, Chiral beta-cyclodextrin-based polymer supports prepared via ring-opening metathesis graft-polymerization,. Chromatogr. A, 907(l-2) 47-56, January 2001. 

Figure 23. Block copolymers prepared via ring-opening metathesis polymerization.

Scheme 41. Representative Exzimple for Dipyridyl Amide-Functionalized Polymer Beads for the Selective Binding of Hg(II) and Pd0I) Prepared via Ring-Opening Metathesis Precipitation Polymerization and for the Preparation of Heterogeneous Supports for Heck-Type Couplings, Respectively ...

An alternative to the experiments just described is the esterification of chitosan with the use of lactide or polylactide for example, Skotak et al. [59] prepared chitosan derivatives following a one pot approach by grafting L-lactide oligomers via ring-opening polymerization. Chitosan (600 mg) was dissolved in 10 mL of... 

Polycarbonates are also high melting rigid polymers. They were, therefore, also looked at for potential use in nonlinear optics. To achieve high molecular weights, some attempts were made to prepare them via ring opening polymerization. This, however, led to intractable materials. The cyclic structure can be shown as follows ... 

SUPPORTS PREPARED VIA RING-OPENING METATHESIS PRECIPITATION POLYMERIZATION... 

H.-J. Wu and L. V Interrante (1989), Preparation of a Polymeric Precursor to Silicon Carbide via Ring-Opening Polymerization Syntheses Poly[(methylchlorosilylene)-methylene] and Poly(sila-propylene), Chem. Mater. 1, 564. 

The scheme for the preparation of the poly(alkylene phosphonate)s and poly(alkylene phosphate)s via ring-opening polymerizations is given in Figure 2. This can be separated into two phases 1) the ring-opening polymerizations of the cyclic phosphites to form the poly(alkylene phosphonate)s and 2) the conversion of the poly(alkylene phosphonate)s to poly(alkylene phosphate)s. These procedures are modifications of those reported in the literature and are discussed below. 

Polymers and copolymers of lactic acid are best prepared by a condensation reaction at elevated temperature, via ring-opening polymerization of the corresponding lactide as can be seen in Scheme 11.2. 

The first step reaction example involves the preparation of water-based epoxy resins via ring-opening polymerizations of different epoxides with various diamines, dithiols or diols residing in the miniemulsion droplets at 60°C [75]. The basic requirement for successful miniemulsion polymerization is that both reactive components exhibit relatively low solubility in the continuous aqueous phase. The diepoxide Epikote E828, triepoxide Decanol EX-314, and tetraepoxide EX-411 are potential candidates for this purpose. Furthermore, incorporation of conventional costabilizers such as hexadecane into the... 

---