A polycarbonate copolymer includes a repeating unit represented by a formula (1) below and a molar copolymer composition represented by Ar
2
/(Ar
1
+Ar
2
) in a range of 25 mol % to 50 mol %.
In the formula (1): Ar
1
and Ar
2
represent a divalent aromatic group; a chain end is terminated by a monovalent aromatic group or a monovalent fluorine-containing aliphatic group; and n represents an average repeating number of an Ar
1
block and is a numeral of 1.0 to 3.0, provided that Ar
1
and Ar
2
are not the same.
一种聚
碳酸酯共聚物,包括由下式(1)表示的重复单元和在Ar2/(Ar1+Ar2)范围内的摩尔共聚物组成,该组成在25摩尔%至50摩尔%之间。在式(1)中:Ar1和Ar2表示二价芳香基;链端由一价芳香基或含
氟一价脂肪基终止;n表示Ar1块的平均重复次数,是1.0到3.0的数字,前提是Ar1和Ar2不相同。