Cross-link structure copolymer degradation

Temperature dependence (related to the temperature dependence of the conformational structure and the morphology of polymers) of the radiation effect on various fluoropolymers e.g., poly (tetrafluoroethylene-co-hexafluoropropylene), poly(tetrafluoroethylene-co-perfluoroalkylvinylether), and poly(tetrafluoroethylene-co-ethylene) copolymers has been reported by Tabata [419]. Hill et al. [420] have investigated the effect of environment and temperature on the radiolysis of FEP. While the irradiation is carried out at temperatures above the glass transition temperature of FEP, cross-linking reactions predominate over chain scission or degradation. Forsythe et al. [421]... 

Albertsson and coworkers [240-244] carried out extensive research to develop polymers in which the polymer properties are altered for different applications. The predominant procedure is ring-opening polymerization which provides a way to achieve pure and well defined structures. They have utilized cyclic monomers such as lactones, anhydrides, carbonates, ether-lactones. The work involved the synthesis of monomers not commercially available, studies of polymerization to form homopolymers, random and block copolymers, development of cross-linked polymers and polymer blends, surface modification in some cases, and characterization of the materials formed. The characterization is carried out with respect to the chemical composition and both chemical and physical structures, the degradation behavior in vitro and in vivo, and in some cases the ability to release drug components from microspheres prepared from the polymers. 

Hydrogels are another type of polymer structure comprised of a hydrophilic cross-linked network that swells in water. They can exist as homopolymers, copolymers, or multipolymers and are generally biocompatible and have low degradation. Hydrogels can be produced with a wide range of swelling... 

Amine light stabilizer, melamlne-acryllo copolymer degradation, 281-83 Amine-cured epoxy networks cross-link density, 166-67,177-81 structure characterization, 172-73... 

Figure 19 Representative scheme for the preparation of hollow nanotubes with one open end from a bottlebrush block copolymer, (a) Chemical structure of a bottlebrush copolymer, (b) AFM height image of the corresponding shell-cross-linked copolymer adsorbed on mica, (c) TEM characterization of organic nanotubes obtained after core degradation. Reproduced with permission from Huang, K. Rzayev, J. J. Am. Chem. Soc. 2009, 131 (19), 6880-6885. ...

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