Abstract: The polymer electrolyte membrane according to the present invention comprises a polymer electrolyte having ion-exchange groups, wherein Sp and Snp satisfy a relationship expressed by the following expression (I): Sp/Snp?0.42??(I) where Sp represents the total of peak areas obtained by measurement of a 13C-solid state nuclear magnetic resonance spectrum of the polymer electrolyte membrane, the polymer electrolyte membrane having been subjected to a first immersion treatment comprising immersing the polymer electrolyte membrane in 5 mmol/L iron (II) chloride tetrahydrate aqueous solution at 25° C. for 1 hour, and thereafter drying the polymer electrolyte membrane at 25° C.

Abstract: The invention provides a method of obtaining a compatible resin blend from at least two incompatible resins which are not conventionally blended with each other. The blend of an incompatible resins is dissolved at a molecular level by being melted and sheared under a high shearing rate by rotating a screw without adding a compatibilizer or the like.

Abstract: Bone-treating devices made of biodegradable polymers having a high-density and a high-orientation along the major axis, which have a density of 1.260 g/cm.sup.3 or more (when measured by the sink and float method) and which possess the bending strength and the bending strength-retaining characteristic defined by the following equations:A.gtoreq.B.gtoreq.23 (kgf/mm.sup.2) (1)B/A.gtoreq.0.85 (2)wherein A is the initial bending strength and B is the bending strength after 90-days immersion of the devices in a phosphate buffer at 37.degree. C. and preparing the same.