A method is provided for controlling the molecular weight of a polyhydroxyalkanoate containing at least one of a unit: -[OCH((CH2)mR1)CH2C(O)]- (m=1-8; R1 is a residue having a ring structure of any of phenyl and thienyl structure), and a unit: -[OCH((CH2)kC6H10R2)CH2C(O)]- (k=0-8; R2 denotes a substituent on the cyclohexyl group including H, CN, NO2, halogen atom, CH3, C2H5, C3H7, CF3, C2F5 or C3F7), wherein a microorganism is cultivated in the presence of a hydroxyl group-containing compound, which is capable of producing the polyhydroxyalkanoate from R3(CH2)qCH2CH2COOH (q=1-8; R3 contains a residue having a ring structure of phenyl or thienyl) or R4C6H10(CH2)rCH2CH2COOH (r=0-8; R4 denotes a substituent on the cyclohexyl group including H, CN, NO2, halogen, CH3, C2H5, C3H7, CF3, C2F5, or C3F7).
本发明提供了一种控制聚羟基烷酸酯分子量的方法,该聚羟基烷酸酯含有至少一个单元:-[OCH((
CH2)mR1) C(O)]-(m=1-8;R1 是具有苯基和
噻吩基结构中任何一种环结构的残基),以及一个单元:-[OCH(( )kC6H10R2) C(O)]-(k=0-8;R2 表示环己基上的取代基,包括 H、CN、
NO2、卤素原子、
CH3、
C2H5、
C3H7、
CF3、
C2F5 或
C3F7),其中在含羟基化合物存在下培养微
生物,该微
生物能够由 R3( )q COOH(q=1-8;R3 包含具有苯基或
噻吩基环结构的残基)或 R4C6H10( )r COOH (r=0-8;R4 表示环己基上的取代基,包括 H、CN、 、卤素、 、 、 、 、 或 )。