Blends of SBS triblock copolymer with poly(2,6‐dimethyl‐1,4‐phenylene oxide)/polystyrene mixture

Abstract

Blends of styrene-butadiene-styrene triblock copolymer (SBS) with random styrene-maleic anhydride copolymers (PS-co-MA), having different MA content, were prepared in a Brabender Plastigraph mixer. The presence of polystyrene (PS) blocks in the SBS copolymer and the high styrene content (93 and 86 wt.-%, respectively) in the two bands of used PS-co-MA samples afforded a good compatibility between the PS phases of the two polymers. On the other hand, the presence of polar anhydride groups allows a net improvement of the thermal properties of the polystyrene phase of the blends as shown by differential scanning calorimetry (DSC) analysis. In addition, the dynamic behavior of the blends, as highlighted by dynamic thermo-mechanical analysis (DMTA), shows in all cases a "stiffening" of the material in comparison to original SBS. Preliminary experiments aimed to convert, directly in the mixer, the anhydride groups into the corresponding zinc salt allowed only a partial neutralization. Both DSC and scanning electron microscopy (SEM) indicate that the reaction is not complete under the used experimental conditions

Properties of SBS and sisal fiber composites: ecological material for shoe manufacturing

“…Below 100 °C the mass loss is equivalent to the moisture percentage of the fiber (around 8%). The SBS degradation started at about 420 °C, as observed by Picchioni et al 13 . The thermal event that occurred at 300 ˚C is attributed to paraffinic oil degradation.…”

Compatibilization of polyamide 6/poly(2,6-dimethyl-1,4-phenylene oxide) blends by poly(styrene-co-maleic anhydride)

“…Blends of a PPO/PA6 alloy toughened with a novel polyolefin elastomer, poly(ethylene-1-octene) (POE), were prepared via melt extrusion [6]. In order to improve the compatibility between POE and the PPO/PA6 alloy, POE was grafted with maleic anhydride (MA), which could react with the amine group of PA6.…”

“…Therefore, modification of polymer blends by a compatibilizer has been extensively investigated to obtain polymer blends with more desirable properties [3]. The common route to overcome the incompatible obstruction of a polymer blend is to add a suitable compatibilizing agent, usually a block or graft copolymer, to lead to a great improvement of the mechanical properties of the blend [4][5][6].…”

Preparation and characterization of nanocomposites with polyphenylene oxide

“…Blending of two or more polymers offers an interesting route to modifying the properties of thermoplastics. A rich variety of alloys of PPO such as PPO/PP (Hong et al, 2012), PPO/PBT (Liu et al, 1996), PPO/PPS (Stokes, 1998), and PPO/SBS (Picchioni et al, 2003) were also synthesized in the blending way. The most intriguing research in physical modification is the preparation of the alloys of PPO by blending.…”