Synthesis of IPNs and Related Materials

Depending on the needs of the investigator, the synthesis of an IPN may be considered from several different points of view. Description according to chemical composition, synthetic mode, and final topology each have their place. Any method of describing the synthesis must distinguish the IPNs from other multicomponent systems and show the relationships among the IPNs. The scope and limitations of each descriptive mode first require definition. 

Chemical Composition. A list of the several reactants such as monomers, prepolymers, crosslinkers, and initiators will be provided, together with a step by step reaction scheme. Such a presentation provides the greatest detail, yet by itself only provides an empirical formulation, lacking greatly in capability of systematization. 

Elements of both points 2 and 3 above require an understanding of each chemical reaction and side reaction, and all of the physical transformations taking place—an understanding that is seldom achieved. In cases of doubt, the intent of the original investigator will be mentioned, along with other possible interpretations. In the following, elements of each method will be presented, as necessary, to convey to the reader an accurate picture. 

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The previous section showed how IPNs and related materials can be synthesized. The several synthetic methods, such as sequential, simultaneous, latex, and thermoplastic IPN formation, will result in different morphologies. One of the main advantages of IPN synthesis relates to the ease of promoting dual phase continuity, i.e., for a... 

This chapter will discuss the synthesis, morphology, and mechanical behavior of IPN s. Related materials, in particular the interpenetrating elastomeric networks (lEN s) of Frisch (Frisch and Klempner, 1970 Klempner et a/., 1970 Matsuo et a/., 1970h) will be included for comparison. 

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