Abstract
This work concerns the enhancement in the compatibility of blends of poly (1,4-butylene adipate) (PBA) with poly (hydroxy ether of bisphenol-A) (phenoxy) via alcoholytic exchange. Results on the thermal behavior and morphology show that the blended PBA/phenoxy system exhibits a homogeneous phase and a composition-dependent glass transition temperature (Tg). The interaction parameter (χ12) of PBA/phenoxy blends was calculated using the melting point depression method and was found to be −0.336. However, the compatibilization of PBA/phenoxy blends can be enhanced by chemical exchange reactions between PBA and phenoxy upon annealing. Annealed PBA/phenoxy blends were found to have a homogeneous phase with a higher Tg than that of the blended samples, and a smooth surface topography that could be improved by annealing at high temperature. The results of this investigation demonstrate that promotional phase compatibilization in the PBA/phenoxy blend can only be obtained upon thermal annealing, thus causing transreactions to occur between the dangling –OH of the phenoxy and the ester functional groups in PBA. Extensive transreactions cause alcoholytic exchange between the PBA and phenoxy to form a network, thus reducing the mobility of the polymer chain. Finally, the crystallinity of PBA decreased as the degree of transreaction in the blends increased.
Highlights
Polymer blending is a more economical method for making new materials or compounds compared to direct polymer synthesis
Rana et al [7,8,9,10,11,12,13] reported a series miscible or immiscible blends such as poly/poly, poly/poly, blends of ethylene 1-octene copolymers, polys/polyacrylates, and polyethylene/polyolefins blends that result in novel properties for various end uses
Results and Discussion for the PBA/phenoxy blends was used to identify the miscibility during DSC experiments [14,36,37,38]
Summary
Polymer blending is a more economical method for making new materials or compounds compared to direct polymer synthesis. Miscible blends possess thermodynamics solubility and are characterized by the presence of a single phase and glass transition temperature (Tg ). Their properties can often be predicted from the weighted average composition of the properties of the individual components. The potentially useful specific interactions include(strong chemical There are many of compatibilizing blends, including the introduction of nonreactive ofmethods compatibilizing immiscibleimmiscible blends, including the introduction of nonreactive grafts orgrafts blockor block copolymers, nonbonding specific interactions, coupling agents, and reactive polymers [14]. A transreaction or exchange reaction at high temperature, causing separated phases in the blends to become partially or wholly miscible.
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