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Abstract
Miscibility with a linear T g-composition relationship was proven for blend of poly(butylene adipate-co-butylene terephthalate) [P(BA-co-BT)] with poly(4-vinyl phenol) (PVPh). In comparison to the blends of PBA/PVPh and poly(butylene terephthalate) (PBT)/PVPh, the Kwei's T g model fitting on data for the P(BA-co-BT)/PVPh blend yields a q value between those for the PBA/PVPh and PBT/PVPh blends. The q values suggest that the interaction strength in the P(BA-co-BT)/PVPh blend is not as strong as that in the PBT/PVPh blend. Upon mixing the PVPh into the immiscible blend of PBA and PBT, the ternary PBA/PBT/PVPh blends only exhibits partial miscibility. Full-scale ternary miscibility in whole compositions is not possible owing to the significant [increment]χ effect (χ ij-χ ik). The wavenumber shifts of the hydroxyl IR absorbance band indicates that the H-bonding strength is in decreasing order--PBT/PVPh > P(BA-co-BT)/PVPh > PBA/PVPh--and shows that the BA segment in the copolymer tends to defray interactions between P(BA-co-BT) and PVPh in blends.