A novel combination of sandwich and co‐continuous structure based on polypropylene and styrene‐butadiene‐styrene block copolymer formed with wide range of polypropylene content

Abstract

The styrene-butadiene-styrene block copolymer (SBS)/polypropylene (PP) blends with a unique sandwich layered cocontinuous structure were prepared by melt compounding. Differing from single conventional co-continuous and sandwich structure, this structure was formed, where pure PP and co-continuous SBS/PP phase acting as the face sheets and core. Even though the volume content was 20 or 10 vol %, PP always amazingly formed a continuous phase in SBS/PP blends, whereas the morphology of SBS phase relatively changed from dispersed particles to continuous network as its content increased to 50 vol %. For immiscible SBS/PP blends, due to the huge difference of complex viscosity and surface tension between SBS and PP, a pure PP layer existed on the surface of blends which can be ascribed to the PP enrichment. Herein, the structure of blends with more than 50 vol % SBS was presented as sandwich layered co-continuous structure by combining the pure PP layer and co-continuous structure. V C 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 46580.

Design of sandwich structure conductive polypropylene/styrene‐butadiene‐styrene triblock copolymer/carbon black composites with inherent morphological tunability

“…Previously, the co-continuous PP/SBS blends with the sandwich structure were formed by mixing immiscible PP and SBS. 8,18 The sandwich structure with a thin PP layer on the surface and PP/SBS co-continuous mixture in the core were formed, as the result of the huge viscosity difference between PP and SBS. Based on our previous works, this work changes the compounding sequences of PP/SBS/CB composites to design tunable morphology ( Figure 1).…”

“…As divided by the red line in Figure 4(a), the PP enrich layer on the surface, and the PP/SBS blend locate in the core. 8,18 The isotactic polypropylene chain with regular configuration often crystallizes easily. 26 The DSC analysis are given in supporting information.…”

Study of the phase morphology and toughness in poly (vinyl chloride)/acrylonitrile–styrene‐acrylic/styrene–butadiene–styrene ternary blends influenced by interfacial/surface tension

“…15,16 However, the low-temperature toughness of the blends is unsatisfactory. Styrene-butadiene-styrene (SBS) block copolymer is a kind of thermoplastic elastomer with an enough low glass transition temperature (T g ) of butadiene (PB) at about −90 C, 18 and the low T g of SBS has the potential to improve the toughness at 0 C. In addition, there are two types of SBS: star-shaped SBS and linear SBS. The molecular weight of star-shaped SBS is generally higher than that of linear SBS, and its elastic modulus is higher than that of linear SBS.…”

Research and development of a composite with transparent polypropylene fiber part II: multi-quality optimization parameter design for high impact resistance of polypropylene/enhanced by rubber segment-styrene ethylene/butylene styrene composites

“…Isotactic homopolymerization polypropylene (PP) is an important type of thermoplastic polymer with good mechanical properties, solvent resistance, high temperature resistance, and processability. 1 It is a versatile material that can be widely applied in mechanical components, home appliances, and industrial applications. 2 However, due to its poor impact strength, especially at low temperatures, there are limits to its applications.…”

“…2 However, due to its poor impact strength, especially at low temperatures, there are limits to its applications. 1 In order to improve the impact properties, PP can be blended with elastic polymers. Enhanced by rubber segment-styrene ethylene/butylene styrene (ERS-SEBS) polymers are a type of thermoplastic elastomer offering improved processability and flexibility.…”