Synthesis, of IPN

Of direct interest to the investigator is the prediction and control of the domain size of phase separated materials. While the first synthesis of IPN s in this laboratory (1969) [1 ] lacked... 

Thus, this research focused on the synthesis of IPNs which have a high and broad tan S. Two-component IPN systems that proved the most promising were used as the foundation for foams. Three-component IPN foams have yet to be prepared. 

The obvious interest in interpenetrating polymer networks (IPN) based on very different macromolecu-lar structures has spurred some studies involving terpenols. Thus the synthesis of IPN involving poly(St) and poly(citronellol-alf-MMA) [87] and of poly(a-terpineol-co-St) with ethyl acrylate crosslinked with divinylben-zene have been reported [74]. 

J. R. Millar, Interpenetrating Polymer Networks—Styrene-Divinylbenzene Copolymers with Two and Three Interpenetrating Networks, and Their Sulphonates, J. Chem. Soc., 1311 (1960). Synthesis of IPNs. Swelling Behavior of IPNs. vs. crosslink density. 

Schematic representation of synthesis of IPNs through (a) sequential and (b) simultaneous methods. ...

Comparisons with reference systems are also provided e.g. NDIO is a much better photoinitiator than the well known camphorquinone CQ (Table 1) upon a low intensity source (halogen lamp). This system leads to final tack-free coatings whereas no polymerization is observed with the CQ based system. TMPTA (trimethylol propane acrylate), EPOX ((3,4-epo>ycyclohexane)methyl 3,4-epo ycyclohe ylcarbo5ylate) and DVE-3 (triethylene glycol divinyl ether) are used as representatives of low viscosity monomers. Figure 6 shows that the synthesis of IPN (Fig. 6A epoxide and acrylate conversions 60%) or thiol-ene (Fig. 6B vinylether and trithiol conversions around 100 and 40%, respectively) is very efficient even upon a low intensity LED bulb. 

Water-in-oil (w/o) emulsion-crosslinking method is a very common method for the synthesis of IPN hydro gel by sequential pathway. Figure 15.5 is a schematic representation of stearic acid-coated IPN microsphere prepared by water-in-oil (w/o) emulsioncrosslinking method [73]. 

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