1. What are some specific types of porogens that can be used to control pore size and distribution in crosslinked polystyrene? What effects do different porogen types have on the resulting pore structure?

2. How exactly does increasing crosslinking density affect the porosity and overall structure of crosslinked polystyrene? What specific changes occur to the polymer network structure? How do these changes impact properties like porosity and mechanical strength?

3. What are some specific polymerization conditions that can be controlled to affect the crosslinking density and properties of crosslinked polystyrene? How do factors like temperature, initiator concentration, and reaction time specifically impact crosslinking density and material properties?

4. What are some tradeoffs between using porogen type/concentration control vs crosslinking density/polymerization control to obtain desired material properties? Under what circumstances might one approach be preferred over the other?

5. What are some specific applications where crosslinked polystyrene with controlled porosity might be useful? How would the optimal approach to controlling porosity depend on the application?
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