Telechelic prepolymers

The prepolymers described above are one type of telechelic polymer. A telechelic polymer is one containing one or more functional end groups that have the capacity for selective reaction to form bonds with another molecule. The functionality of a telechelic polymer or prepolymer is equal to the number of such end groups. The macrodiol and macrodiisocyanate telechelic prepolymers have functionalities of 2. Many other telechelic prepolymers were discussed in Sec. 2-12. (The term functional polymer has also been used to describe a polymer with one or more functional end groups.)... 

Halogeno-telechelic polymers result from complete ionization of both ends of telechelic prepolymers. Teyssie et aL [38] developed a facile process of synthesizing dicarboxylato polymers based on Group IVb metal ions (Ti/Zr). Addition of a stoichiometric amount of tetra-n-butoxy-titanium Ti(0-nBu)4 to a carefully... 

The preparation of prepolymers [111] or macromers with functional end groups, so called telechelic polymers, is another approach to structurally unconventional architecture. The functional end groups are introduced either by functional initiation or end-capping of living polymers, or by a combination of the two. In this way, monomers that are not able to copolymerize can be incorporated in a copolymer. Telechelic prepolymers can be linked together using chain extenders such as diisocyanates [112]. In this process, it is essential that the structure and end groups of the prepolymers can be quantitatively and qualitatively controlled [113]. 

Star-shaped polymers can be prepared by using a multifunctional initiator, e.g., pentaerythritol and a catalyst which initiates ROP of the selected monomer. A second approach is to use telechelic prepolymers that are linked together after polymerization. 

Usually the adjustment of properties is carried out by using mixtures of high molecular weight polydispersed telechelic prepolymers and simple low molecular weight molecules. Recently, we produced a review about the prepolymers mentioned above [8] which we will not describe in this paper. This work concerns the synthesis of low molecular weight monodispersed molecules, their properties and eventually their applications. 

Telechelic prepolymers having epoxide end-groups as well as telechelics containing amino end-groups and cyclooligomers were foxmd in the FAB mass spectra of epoxy-amine addition polymers. An FAB-MS study characterized in detail the oligomeric products formed in the synthesis of Novalak-type resin. ... 

Klee, J.E., Hagelle, K., and Przybylski, M., Mass Spectrometry Characterization of a 2,2-bis-4-(2,3-epoxy)phenylpropane-aniline Addition Polymer and its Telechelic Prepolymers, Macromol. Chem. Phys., 196, 937,1995. 

A monocyclic polymer with an emanating linear or branched segment - commonly referred to as tadpoles - constitute a group of simple, cyclic topologies. Previously, the ESA-CF process has been used to construct a variety of tadpole polymers, in which the self-assembly consists of two polymer components (i.e., one unit each of monofunctional and difunctional telechelic prepolymers) and a trifunctional counteranion, leading to the formation of a tadpole (Scheme 18.2a). Conversely, a... 

The intrinsic viscosity [r ] of the non-neutralized carboxy telechelic prepolymers has been measured in toluene at 25°C and the calculated values of gpg reported in Table IV, together with the... 

Telechelic prepolymers have been prepared in a number of ways, but since we are concerned with HRs, only free radical and anionic polymerization are pertinent (although some kinds of termination have been introduced by reaction of existing functional groups). Table 5 shows functionally terminated olefin addition... 

Chujo Y, Hiraiwa A and Yamashita Y (1984) S5mthesis of segmented copolyamides by using telechelic prepolymers, Makromol Chem 185 2077-2087. 

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