Abstract: The present invention provides a stretchable hydrogel able to stretch over 200 times its length, methods of preparing such a hydrogel and compositions comprising the hydrogel.

Abstract: A new method for crosslinking polyethylene oxide (PEO) by means of a dialkyl peroxide to form a gel, which can imbibe large amounts of water. Two separate ovens were used to crosslink PEO with the peroxide. The first oven is set at 85° C. for 2.5 minutes for melting the polymer and purging oxygen with acetone vapors and forming a shield around the sample to minimize oxygen diffusion from outside, meanwhile, trapping peroxides inside. A second oven was used to thermally decompose the peroxide. The crosslinking reaction proceeds at 160° C. for 15 minutes.

Abstract: Two cylinders with two holes at the ends, gripping in each other. Two key rings are installed in these holes. The outer cylinder key ring moves through a split in the inner cylinder. The upper side of outer cylinder is used to attach a penholder to it. This key holder gives an excellent option to carry the keys without inconvenience inside the pocket. It is aligned with foot axis. It can be easily removed from the pocket and be used by moving cylinders together with easy access to whole keys. They can easily be separated from each other and replaced in the pocket.