Abstract: A membrane useful in gas separation, the membrane comprising a cross-linked polysiloxane structure having a cross-link density of about 0.1×10?5 mol/cm3 to about 6×10?5 mol/cm3, where, in particular embodiments, the cross-linked polysiloxane structure has the following general structure: wherein R1, R2, R3, R4, R5, and R6 are independently selected from hydrocarbon groups having at least 1 and up to 6 carbon atoms; A1 and A2 are independently selected from cyclic hydrocarbon groups; L1 and L2 are linking groups or covalent bonds; n is an integer of at least 1; r and s are independently selected from integers of at least 1; and p is an integer of at least 10. The invention also includes methods for making and using the above-described membranes for gas separation.

Abstract: A membrane useful in gas separation, the membrane comprising a cross-linked polysiloxane structure having a cross-link density of about 0.1×10?5 mol/cm3 to about 6×10?5 mol/cm3, where, in particular embodiments, the cross-linked polysiloxane structure has the following general structure: wherein R1, R2, R3, R4, R5, and R6 are independently selected from hydrocarbon groups having at least 1 and up to 6 carbon atoms; A1 and A2 are independently selected from cyclic hydrocarbon groups; L1 and L2 are linking groups or covalent bonds; n is an integer of at least 1; r and s are independently selected from integers of at least 1; and p is an integer of at least 10. The invention also includes methods for making and using the above-described membranes for gas separation.

Abstract: A modular structure is disclosed that includes a variety of separate units having an armored panel secured to a frame portion. The units, which exhibit a variety of shapes and dimensions, may be joined together to form modular structures with different configurations. For example, the units may be joined together to form an enclosed modular structure with a box-like configuration that is loaded onto a bed of a conventional truck for the transportation of troops or equipment. When joined, the various frame portions form a frame that extends around the modular structure and provides support, and the various panels are positioned adjacent to each other to form a shell that encloses the individuals or equipment.