Wide-angle X-ray diffraction investigation on crystallization behavior of PA6/PS/SEBS-g-MA blends

Abstract

Blends of polystyrene/polyamide 6 (PS/PA6) compatibilized by styrene-ethylene/butylene-styrene (SEBS) elastomer grafted with maleic anhydride were prepared by melt blending. Wide-angle X-ray diffraction (WAXD) scans indicated a skin-core structure formed in the specimens during the injection-molding process. The results showed that the specimens tended to form the α-crystalline form in the core region, but the γ-crystalline form in the skin region. The influences of PS and SEBS-g-MA on the crystallization of PA6 were different in the core region and skin region. In the core region, PS made the PA6 tend to be in the γ-crystalline form, but the influence of PS was contrary in the skin region. SEBS-g-MA had both enhancement and toughening effects on the blends. The mechanical properties of the blends were determined by the combined action of the two aforementioned factors.

Phase morphology evolution and compatibilization of immiscible polyamide 6/polystyrene blends using nano‐montmorillonite

“…Polyamide 6 (PA6) and polystyrene (PS) have very good complementary effects on the performances of their blends, and more and more researchers have shown interest in the relationship between their morphological structure and properties . The most common preparation method has been direct melting blend.…”

Synthesis and properties of poly(aryl ether ketone)‐based phthalonitrile resins

“…In the past 30 years, phthalonitrile resins have been an important class of high-temperature materials having a variety of potential uses in composite matrices, adhesives, films, and electrical conductors owing to their outstanding thermal and thermo-oxidative stability, excellent mechanical properties, superior moisture resistance, and fire resist-ance [1][2][3][4][5][6][7][8][9][10][11][12][13][14]. Polymerization of these resins occurs through cyano groups with catalyst of organic amines by an addition cure mechanism to propagate through multiple reaction pathways involving polytriazine, polyimine, and polyphthalocyanine formations, which ensures that these materials are usually composed of aromatic/heterocyclic ring systems to achieve thermal and oxidative stability, and little or no volatiles are evolved during the polymerization leading to void-free crosslinked networks [2,[15][16][17].…”

“…In addition, phthalonitrile monomers and oligomers possess a low complex melt viscosity, which enables facile processing by the cost-effective, nonautoclavable processing techniques such as resin transfer molding, resin infusion molding, and filament winding [9]. However, polymerization of the neat phthalonitrile monomer is extremely sluggish, requiring curing additives such as organic amines, and extended heat treatment at elevated temperature to promote the cure of the phthalonitrile resins [1,12,[14][15][16][17][18]. A small processing window (20-30 C) [8,14] and high processing temperature prevent these resins from being fully utilized for extreme applications, such as in aerospace industry; meanwhile, these disadvantages also cause high cost and processing difficulties [8,19,20].…”

“…However, polymerization of the neat phthalonitrile monomer is extremely sluggish, requiring curing additives such as organic amines, and extended heat treatment at elevated temperature to promote the cure of the phthalonitrile resins [1,12,[14][15][16][17][18]. A small processing window (20-30 C) [8,14] and high processing temperature prevent these resins from being fully utilized for extreme applications, such as in aerospace industry; meanwhile, these disadvantages also cause high cost and processing difficulties [8,19,20]. Aromatic ether [7,14,21,22], ketone [7], and sulfone [7,14,21,23] linkages have been previously introduced into phthalonitrile systems, and this has resulted in polymers with outstanding thermal properties.…”

“…A small processing window (20-30 C) [8,14] and high processing temperature prevent these resins from being fully utilized for extreme applications, such as in aerospace industry; meanwhile, these disadvantages also cause high cost and processing difficulties [8,19,20]. Aromatic ether [7,14,21,22], ketone [7], and sulfone [7,14,21,23] linkages have been previously introduced into phthalonitrile systems, and this has resulted in polymers with outstanding thermal properties. It has been generally recognized that the incorporation of ether linkages into an aromatic polymer leads to a lower melting temperature or glass-transition temperature (T g ) and processing advantages [7,24].…”