Ethyltriphenylphosphonium Bromide Research Articles

Polymer blends of PBT and PP compatibilized by ethylene-co-glycidyl methacrylate copolymers

SYNOPSIS The ethylene-co-glycidyl methacrylate (EG) copolymer is an efficient reactive compatibilizer for polymer blends of poly(buty1ene terephthalate) (PBT) and polypropylene (PP). During melt processing, the epoxy functional group of the EG copolymer can react with the PBT carboxylic acid and/or hydroxyl terminal groups at the interface to form various EG-gPBT copolymers. These in situ formed grafted copolymers tend to concentrate along the interface to reduce the interfacial tension at the melt and result in finer phase domains. Higher glycidyl methacrylate (GMA) content in the EG copolymer or a higher quantity of the EG compatibilizer in the blend results in a better compatibilized blend in terms of finer phase domains, higher viscosity, and better mechanical properties. The presence of only 50 ppm catalyst (ethyltriphenyl phosphonium bromide) in the EG compatibilized blend further improves the blend compatibility substantially. 0 1996 John Wiley & Sons, Inc.

In situ reactive compatibilized noryl/LCP blends

AbstractThis article reveals that the already known improved properties of the thermoplastic–liquid crystalline polymer (LCP) blends can be further improved substantially over the corresponding noncompatibilized counterparts by using a reactive in situ type compatibilizer, the styrene–glycidyl methacrylate (SG) copolymer. This SG copolymer has been demonstrated in this article to be an effective reactive compatibilizer to improve the processability, heat deflection temperature, and mechanical properties of Noryl/LCP blends. The epoxy functional groups of the SG copolymer can react with the end groups of PPO (in Noryl) and LCP. The in situ‐formed SG–g–LCP copolymer tends to reside along the interface of Noryl–LCP and reduces the interfacial tension during melt processing. The resultant LCP fibers in the Noryl matrix of the compatibilized blends have a higher aspect ratio because the fibers become finer, longer, and tend to form lamellate domains with a greater interphase contact area than those from the noncompatibilized blends. The compatibilized blends also improve the interphase adhesion between Noryl and LCP. The presence of ethyl triphenylphosphonium bromide catalyst promotes the grafting reaction to improve blend compatibilization. © 1995 John Wiley & Sons, Inc.

In situ compatibilization of PBT/ABS blends through reactive copolymers

Styrene-acrylonitrile-glycidyl methacrylate (SAG) copolymer with ethyltriphenyl phosphonium bromide (ETPB) catalyst has been used successfully as in situ compatibilizer to compatibilize the immiscible and incompatible blends of poly(butylene terephthalate) (PBT) and acrylonitrile-butadiene-styrene (ABS). This SAG copolymer contains reactive glycidyl groups that are able to react with PBT end groups (-COOH or -OH) under melt conditions to form SAG-g-PBT copolymer. However, the rate of the grafting reaction is slow without the presence of catalyst. The ETPB catalyst is highly efficient: even at a concentration as low as 50 ppm, it is able to promote the grafting reaction to obtain the maximum achievable properties. The compatibilized PBT/ABS blend has smaller phase domain, higher viscosity, and significantly improved mechanical properties compared to the corresponding non-compatibilized blend.

ChemInform Abstract: SYNTHESIS AND ANTITUMOR PROPERTIES OF SOME ISOINDOLYLALKYLPHOSPHONIUM SALTS

AbstractAus den co‐Bromalkyl‐phthalimiden (I) entstehen mit Triphenylphosphin die Phosphonium‐Salze (II), mit anderen P(III)‐Verbindungen werden die Salze (III) gebildet, analog entstehen die Salze (IV).

Synthesis and antitumor properties of some isoindolylalkylphosphonium salts.

Antitumor evaluation of 2-(1,3-dihydro-1,3-dioxo-2H-isoindol-2-yl)ethyltriphenylphosphonium bromide (1) revealed significant activity in P-388 lymphocytic leukemia (T/C = 160%). As a follow-up to this chemical lead, a series of closely related phosphonium salts was prepared in which the 1,3-dihydro-1,3-dioxo-2H-isoindole ring system was maintained or in which it was replaced by other moieties such as maleimido, bromo, methoxy, and isoindoline. Syntheses generally involved treatment of the appropriate N-(bromoalkyl)phthalimide with the required phosphine or condensation of the K salt of the substituted imide with beta-(bromoethyl)triphenylphosphonium bromide (12). From the biological data obtained for these compounds, several requirements can be defined for substantial antileukemic activity. Of utmost importance is the presence of a triarylphosphonium halide moiety, coupled to an alkyl chain of two or three carbon atoms. The preferred terminus of the alkyl chain is the 1,3-dihydro-1,3-dioxo-2H-isoindole ring system, although the observed activity of beta-(bromoethyl)-triphenylphosphonium bromide (12) (T/C = 127%) would suggest that a superior carrier molecule could be developed.