A series of novel amphiphilic networks were synthesized by free-radical mediated copolymerization/crosslinking of N,N-dimethyl acrylamide (DMAAm) with various molecular weight octa-methacrylate telechelic polyisobutylene stars (PIB(MA)(8)) as crosslinking agents. The overall composition of the PDMAAm-l-PIB(MA)(8) networks were controlled by controlling the concentration of the starting materials. Crosslinking was essentially complete as indicated by negligible sol fractions in both methanol and n-hexane. Swelling ratios and swelling rates of various PDMAAm-l-PIB(MA)(8) in water and n-heptane were determined and contrasted with those of networks prepared with di- and tri-methacrylate-telechelic PIB croslinkers (PIB(MA)(2) and PIB(MA)(3)). The mechanical properties of water-swollen tubules made of PDMAAm-l-PIB(MA)(8) were studied and compared with tubules made with PIB(MA)(2) and PIB(MA)(3).