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Introduction Degradation: A Real Meaning Mechanisms Involved in Degradation Historical Outline Polymer Erosion Changes in Polymer Structure During Erosion Factors Affecting Degradation Synthesis Structures Surface Analysis Polyanhydride Degradation: In‐vitro and In‐vivo Approaches In‐vitro Degradation and Drug Release In‐vivo Degradation and Drug Release Modeling of Polymer Erosion Production of Polyanhydrides World Market Applications Patents Outlook and Perspectives