Miscible Blends Containing Bacterial Poly(3- hydroxyvalerate) and Poly(p-vinyl phenol)

Miscible Blends Containing Bacterial Poly(3- hydroxyvalerate) and Poly(p-vinyl phenol)

Miscible Blends Containing Bacterial Poly(3- hydroxyvalerate) and Poly(p-vinyl phenol)

ABSTRACT

The miscibility of poly(3-hydroxyvalerate) (PHV)/poly(p-vinyl phenol)(PVPh) blends has been studied by differential scanning calorimetry (DSC) and Fourier
transform infrared (FTIR) spectroscopy. The blends are miscible as shown by the
existence of a single glass transition temperature (Tg
) and a depression of the equilibrium melting temperature of PHV in each blend. The interaction parameter was found
to be 21.2 based on the analysis of melting point depression data using the Nishi–Wang
equation. Hydrogen-bonding interactions exist between the carbonyl groups of PHV
and the hydroxyl groups of PVPh as evidenced by FTIR spectra. The crystallization of
PHV is significantly hindered by the addition of PVPh. The addition of 50 wt % PVPh
can totally prevent PHV from cold crystallization

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