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A polymer having a satisfactory balance between in vivo degradability and satisfactory mechanical properties, which is an A1BA2type polymer comprising a segment A1and a segment A2each having a modified amino acid and a segment B consisting of polyethylene glycol with a number-average molecular weigh

A polymer having a satisfactory balance between in vivo degradability and satisfactory mechanical properties, which is an A1BA2type polymer comprising a segment A1and a segment A2each having a modified amino acid and a segment B consisting of polyethylene glycol with a number-average molecular weight of 8000 or higher bonded at one end to the segment A1and at the other end to the segment A2,and has a number-average molecular weight of 10000 to 600000; an in vivo degradable material which comprises the polymer; and a film for preventing tissue adhesion, an artificial dura mater, a suture, an implant preparation, or a sustained-release drug base each comprising the degradable material.

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1. An A1BA2-type polymer having a number average molecular weight of 10000 to 600000, wherein the polymer is composed of a segment A1and a segment A2each including hydrophobic poly modified amino acids, and a segment B composed of polyethylene glycol with a number average molecular weight of 8000 or

1. An A1BA2-type polymer having a number average molecular weight of 10000 to 600000, wherein the polymer is composed of a segment A1and a segment A2each including hydrophobic poly modified amino acids, and a segment B composed of polyethylene glycol with a number average molecular weight of 8000 or higher, the segment A1being bonded to one end of the segment B while the segment A2is bonded to the other end of the segment B, wherein the total number average molecular weight of the segment A1and the segment A2is from 4000 to 20000. 2. The polymer according to claim 1, wherein the segment A1and the segment A2is the same or different and the modified amino acids of each of the segments A1and A2are selected from the group consisting of poly-β-benzyl-L-aspartate, poly-γ-benzyl-L-glutamate, and a mixture thereof. 3. The polymer according to claim 1, wherein the polymer is an A1BA2-type triblock copolymer with each of the segment A1and the segment A2being a block segment. 4. A biodegradable material comprising the polymer of claim 1. 5. A membrane for preventing tissue adhesion consisting essentially of the biodegradable material of claim 4. 6. An artificial dura mater consisting essentially of the biodegradable material of claim 4. 7. A suture thread consisting essentially of the biodegradable material of claim 4. 8. An implant preparation consisting essentially of the biodegradable material of claim 4. 9. A sustained-release drug base consisting essentially of the biodegradable material of claim 4. 10. The polymer according to claim 2, wherein the ratio of the number of hydrogen atoms bound to aromatic rings in the segments of A1and A2with respect to the number of methylene hydrogen atoms in the segment B ranges from 5:29.5 to 5:89.5.