Graft copolymers of nylon 6 and polyphenylene oxide: Syntheses and their role in compatibilizing nylon 6/polyphenylene oxide blends

Abstract

SYNOPSISPoly(2,6-dimethyl-p-phenylene) oxides (PPO) grafted with nylon 6 were prepared by first quantitatively brominating the PPO, followed by reacting the brominated products with nylon 6 of different molecular weights. The molecular weights of PPOs were kept intact during bromination. These graft copolymers with well-defined structures were used as compatibilizers for nylon 6/PPO blends. Some compatibilization phenomena were observed, as indicated by the mechanical properties of the blends. The best compatibilization was achieved when the graft copolymer is most block-copolymer-like. 0 1994

The application of covalently cross-linked BrPPO as AEM in alkaline DMFC

“…Several groups performed reactions with bromine and they got bromination of the side chain and the arylene backbone [31][32][33]. Applying different reaction conditions, the relation of side chain bromination and backbone bromination can be influenced [34]. The substitution ratio is adjustable with the help of e.g., temperature conditions, but aryl substitution always occurs.…”

Synthesis, characterization, and application of semi-interpenetrating liquid crystalline polymer networks LCP/PS

“…To improve miscibility of the polymers, compatibilizers are used, which are designed to reduce the interfacial energy, improve the interfacial adhesion, and permit a finer dispersion during mixing of the blend components. In recent years, several different approaches have been used for enhancing the compatibility between TLCP and thermoplastic polymer matrixes including (1) adding the block copolymers consisting of the rigid-rod liquid crystalline polymer segments and flexible nonliquid crystalline polymer segments, 4,5 (2) adding the graft copolymers with rigid-rod backbones and the flexible side chains, 6,7 (3) adding ionomers, 8,9 (4) adding multifunctional couplers, 9,10 (5) introducing a long flexible spacer in the main chain of the TLCP, 11 (6) introducing some kind of interaction between TLCP and thermoplastic polymer matrices, 12,13 (7) selecting TLCP and polymer matrix pairs with active sites that can promote specific interactions, such as acid/base or hydrogen bonding, 14 (8) in situ compatibilization by reactive extrusion. 15,16 Based on the extensive and systematic studies on the conventional interpenetrating polymer networks (IPNs), 17 it is believed that interpenetrating liquid crystalline polymer networks might be also another promising effective method for enhancing the compatibility between TLCP and thermoplastics.…”

Compatibilization of PPO/LCP blends by semi-interpenetrating liquid crystalline polymer networks LCP/PS

“…These include: (1) adding the block copolymers consisting of rigid-rod liquid crystalline polymer segments and flexible non-liquid crystalline polymer segments [1][2][3] , (2) adding the graft copolymers with rigid-rod backbones and the flexible side chains [5][6][7] , (3) adding ionomers 8,9) , (4) adding multifunctional couplers 10,11) , (5) introducing a long flexible spacer in the main chain of the TLCP 12) , (6) introducing some kind of interaction between TLCP and thermoplastic polymer matrices [13][14][15][16] , (7) selecting TLCP and polymer matrix pairs with active sites that can promote specific interactions, such as acid/base or hydrogen bonding [17][18][19] , and (8) in-situ compatibilization by reactive extrusion [20][21][22] . Poly(2,6-dimethyl-1,4-phenylene oxide) (PPO) is one of the engineering plastics that possesses excellent thermal stability, good mechanical properties, gas permeability and electric properties as well as a good flame retardant behavior and dimensional stability.…”