Enzymatic Hydrolysis of Polybutylene Succinate,Polybutylene Suberic Acid and Poly(butylene succinate-co-butylene suberate)
Two kinds of homopolyesters,polybutylene succinate(PBS)and polybutylene octoate(PBSub),and four kinds of poly(butylene succinate-co-butylene suberate)copolyesters with different ratios,were synthesized from 1,4-butanediol and different chain length dicarboxylic acid monomers.Using the above six types of polyester as degradation substrate,the degradation of them was studied using keratinase.The polymers and their degradation products were characterized and analyzed by attenuated total reflection Fourier transform infrared spectroscopy,nuclear magnetic resonance spectroscopy,differential scanning calorimetry,X-ray diffraction,and thermogravimetric analysis.The crystal structure,melting point,crystallinity,and thermal stability of the six polyesters have little change.Research show that crystallinity and melting point temperature of polyester are important factors impacting enzymatic degradation of polyester.The degradation of the copolyesters by keratinase arises in the crystalline and amorphous regions,but the amorphous regions are degradating priority.The degradation effect is best when the mole ratio of succinic acid to octanedioic acid is 4/6 and 6/4,but the sample with a mole ratio of 6/4 has a higher melting point,which is the best ratio.
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