Abstract
One of the most commonly used approaches to obtain polymeric materials with micro- and nanoscale features is the use of polymer blends. The first patent for a polymer blend was filed in 1846 and consisted of a mixture of natural rubber with gutta-percha (T. Hancock, English Patent, No. 11,147). Since then, the increasing demand for improved mechanical and optical properties, as well as the need to control polymerization shrinkage and stress in the plastics industry, has led to tremendous developments in terms of multicomponent polymeric materials [18, 43, 59, 69]. At a molecular level, thermoplastic polymer blends can form homogeneous or heterogeneous structures, in which case nano- or micro-sized domains can be formed. The formation of homogeneous and heterogeneous mixtures, as well as the size of the domains in heterogeneous structures, can be controlled through modifications in the composition or in the processing temperature. Of particular interest are the multiphase systems, where there is a potential for polymeric network structure-related reinforcement to occur. For example, for polystyrene and polybutadiene blends, the polybutadiene phase acts as a toughening agent, decreasing the brittleness of polystyrene [83]. One of the biggest challenges with such blends is determining their miscibility and controlling nano- and micro-phase formation through processing to achieve useful products [1, 24, 25, 70]. There are other, more sophisticated mechanisms of multicomponent system formation including thermosetting materials. Block copolymers can be added to a blend to act as compatibilizers and improve the interaction between incompatible phases [75]. Block copolymers can also be designed to self-assemble upon polymerization of a secondary monomer matrix, forming micelles [52] or other structures [68]. Another approach to achieve heterogeneity is to sequentially or simultaneously polymerize a mixture of monomers, which can be initially miscible or immiscible, polymerizable through a similar or dissimilar mechanism (e.g., radical and cationic) [8, 14, 42]. The inclusion of an inert [74] or functionalized prepolymer phase [50] to a secondary monomer matrix has also been used, with favorable shrinkage and stress outcomes [50]. These heterogeneity formation strategies may give rise to either the copolymerizations or the formation of interpenetrating polymer networks (IPNs), as will be discussed later.
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Pfeifer, C.S. (2014). Nanostructured Multiphase Polymer Networks. In: Bhushan, B., Luo, D., Schricker, S., Sigmund, W., Zauscher, S. (eds) Handbook of Nanomaterials Properties. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-31107-9_47
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