The present invention relates to a hydrogel in which cross-linking is formed at a suitable temperature range using temperature-sensitive and cross-linkable phosphazines, a method for producing the same, and a use thereof. The crosslinked hydrogel according to the present invention, Polyphosphazene hydrogels for biomaterials which are crosslinkable only at the time of arrival and are easy to handle and administer as a solution before injection and do not need to be irradiated with ultraviolet light directly to the skin after injection into the body,;
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