Effect of poly(vinyl acetate)(PVAc)on physicochemical properties of PHB/PCL blends
Poly(vinyl acetate)(PVAc)as a non-covalent compatibilizer was incorporated into a polyhydroxybutyrate(PHB)/polycaprolactone(PCL)binary blending system at a mass ratio of 25/75,and its film was prepared through solu-tion casting.The effect of addition amounts of PVAc on the mechanical properties and physicochemical properties of the blend system was investigated.Tensile experimental results indicated that the elongation at break and tensile strength of the PHB/PCL film containing 1 wt%PVAc were 2.50 and 1.19 times higher than those of the counterpart film without PVAc,respectively.FTIR spectra showed that there was an intermolecular hydrogen bonding interaction between the carbonyl and methyl groups of PHB and PCL due to a bridging action of PVAc.This results in a shift of carbonyl absorp-tion band along with a decrease in the peak intensity.SEM showed that the addition of PVAc reduced the size of dis-persed phase in the blend system,promoting a more uniform distribution.As a result,and the compatibility of the blend system was improved.
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