The invention relates to novel monomers of Formula (I) useful for preparation of phase-separated biocompatible polymers or polymer compositions. These polymers or polymer compositions may be bioresorbable and/or biodegradable and have desirable mechanical properties, such as fracture and/or fatigue toughness, which have not been a primary design criteria for such polymers previously. The polymers or polymer compositions are useful in a variety of medical applications, such as in the fabrication of medical devices. Therefore, methods for preparing these polymers or polymer compositions and medical devices are also encompassed by this disclosure.