Ternary polymer mixtures: Polyarylate/phenoxy/poly(butylene terephthalate)

Abstract

SynopsisThe intended objective of this work was to bring together two immiscible polymers, polyarylate (PAr) and Phenoxy [poly(hydroxy ether of bisphenol-A)], preparing ternary mixtures with a third component, poly(buty1ene terephthalate) (PBT). Experimental results showed that ternary mixtures containing 30% or more PBT gave single glass transition temperatures by DSC. Moreover, the PBT melting point depended on the composition of the mixtures. These results, which could be indicative of the existence of a single amorphous phase in these blends, have been discussed. Nevertheless, results must be considered with caution, given the peculiarities of the T,-composition diagrams for the miscible pairs PAr/PBT and Phenoxy/PBT. Hypothetic interchange reactions during melting have been found to be unimportant.

Investigations of transesterification in PC/PBT melt blends and the proof of immiscibility of PC and PBT at completely suppressed transesterification

“…The melting temperature T m was determelting behavior. 16,21,22 At the transition to the mined as the temperature of the peak position. random copolymers the crystallinity vanishes ow-…”

Reactive Melt Processing of Aliphatic/Aromatic Polyamide Blends: Effect on Molecular Structure, Semicrystalline Morphology, and Thermal Properties

“…The occurrence of transreactions can also give rise to a melting point depression of the crystallised component [36,37]. This phenomenon is often used to follow the extent of transreactions in the melt; the continuous depression of the observed melting point is a measure of the extent of the transreaction processes [24,29,35,38].…”

Influence of phenoxy addition on the curing kinetics for uncatalyzed and catalyzed cyanate ester resin

“…It has a pendant hydroxyl group in its structural repeat unit, which may act as proton donor, and which is able to react at high temperatures with other functional groups, such as esters or amides. [29][30][31][32] Moreover, it is known that the polycyclotrimerization of cyanate esters to form cyanurates is very sensitive to small amounts of impurities and catalysts. For example, it is speculated that residual phenolic OH groups, stemming from the monomer synthesis, may react with a cyanate group to form an iminocarbonate which, subsequently, may react with two more OCN groups to give a cyanurate ring, releasing the phenolic compound.…”