Blends of Syndiotactic Polystyrene with SBS Triblock Copolymers

Picchioni, Francesco; Passaglia, Elisa; Ruggeri, Giacomo; Ciardelli, Francesco

doi:10.1002/1521-3935(20010701)202:11<2142::aid-macp2142>3.0.co;2-h

Cited by 12 publications

(10 citation statements)

References 14 publications

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“…In this work a commercial PPO/PS mixture was used to combine the good solubility of both PPO and PS into the PS domains of the triblock copolymers SBS and SEBS with the synergism in thermal and mechanical properties previously observed for blends of SBS with PS‐based materials 8, 9, 11–13…”

Section: Introductionmentioning

confidence: 99%

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

Picchioni¹,

Casentini²,

Passaglia³

et al. 2003

J of Applied Polymer Sci

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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

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Section: Introductionmentioning

confidence: 99%

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

Picchioni¹,

Casentini²,

Passaglia³

et al. 2003

J of Applied Polymer Sci

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“…It is well known that block copolymers can work as effective compatibilizers for immiscible polymer blends 39, 40. In fact, there have been many studies aimed at improving the inherent low impact strength of commercial syn ‐PS through blending with rubbery or elastic materials such as ethylene/propylene rubber or ST–BD–ST copolymers 41–44. To investigate the potential of the stereoregular PS–PB block copolymers obtained in this work, we created a series of binary syn ‐PS/ cis ‐PB blends with the addition of various amounts of the stereoregular syn ‐PS‐ b ‐ cis ‐PB copolymer.…”

Section: Resultsmentioning

confidence: 99%

Stereospecific sequential block copolymerizations of styrene and 1,3‐butadiene with a C₅Me₅TiMe₃/B(C₆F₅)₃/Al(oct)₃ catalyst

Tsunogae¹,

Shiono

2005

J. Polym. Sci. A Polym. Chem.

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This article reports a new methodology for preparing highly stereoregular styrene (ST)/1,3-butadiene (BD) block copolymers, composed of syndiotactic polystyrene (syn-PS) segments chemically bonded with cis-polybutadiene (cis-PB) segments, through a stereospecific sequential block copolymerization of ST with BD in the presence of a C 5 Me 5 TiMe 3 /B(C 6 F 5 ) 3 /Al(oct) 3 catalyst. The first polymerization step, conducted in toluene at Ϫ25°C, was attributed to the syndiospecific living polymerization of ST. The second step, conducted at Ϫ40°C, was attributed to the cis-specific living polymerization of BD. The livingness of the whole polymerization system was confirmed through a linear increase in the weight-average molecular weights of the copolymers versus the polymer yields in both steps, whereas the molar mass distributions remained constant. The profound cross reactivity of the styrenic-end-group active species with BD toward ST led to the production of syn-PS-b-cis-PB copolymers with extremely high block efficiencies. Because of the presence of crystallizable syn-PS segments, this copolymer exhibited high melting temperatures (up to 270°C), which were remarkably different from those of the corresponding anionic ST-BD copolymers, for which no melting temperatures were observed. Scanning electron microscopy pictures of a binary syn-PS/cis-PB blend with or without the addition of the syn-PS-b-cis-PB copolymers proved that it could be used as an effective compatibilizer for noncompatibilized syn-PS/cis-PB binary blends.

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“…16,17 Recently, several approaches to the modification of sPS, including the syndiotactic copolymerization of styrene with a second monomer, the postfunctionalization of sPS via sulfonation or Friedel-Crafts acylation reactions, and graft copolymerization have been developed to overcome these limitations. [18][19][20][21] Stable free-radical polymerization, which is often also described as nitroxide-mediated polymerization, is well established as a controlled radical polymerization methodology. 22,23 The systematic variation of monomer weight to the moles of the initiator leads to predictable molecular weights and relatively low polydispersities (Mw/MnB1.20).…”

Section: Introductionmentioning

confidence: 99%

Synthesis and characterization of an exfoliated modified syndiotactic polystyrene/Mg–Al-layered double-hydroxide nanocomposite

Jaymand

2010

Polym J

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This paper describes the synthesis and characterization of a controlled graft and block copolymerization onto syndiotactic polystyrene (sPS) using nitroxide-mediated living radical polymerization and the preparation of its polymer/layered doublehydroxide (LDH) nanocomposite. The graft and block copolymerization of styrene and p-methylstyrene were initiated with arylated sPS carrying 2,2,6,6-tetramethyl-1-piperidinyloxy groups as a macroinitiator. The structures of obtained graft and block copolymers were determined by 1 H nuclear magnetic resonance and Fourier transform infrared spectroscopy. The MgAl(Cl)-LDH precursor was prepared with microwave irradiation using a mixed solution of MgCl 2 and AlCl 3 , which was slowly pumped into decarbonated water. Thereafter, the surfactant-modified MgAl(SDBS) was obtained by the anion exchange reaction of MgAl(Cl)-LDH with sodium dodecyl benzene sulfate (SDBS). Finally, the sPS-g-(PS-b-PMS)/MgAl-LDH nanocomposite was prepared by a solution intercalation method. The exfoliated structure of the nanocomposite was probed by X-ray diffraction and transmission electron microscopy (TEM). Compared with pure sPS-g-(PS-b-PMS), the nanocomposite shows a much higher decomposition temperature and higher glass transition temperature. Keywords: functionalization; layered double hydroxide; living radical polymerization; modification; nanocomposite; syndiotactic polystyrene INTRODUCTIONRecently, there has been considerable interest in polymer/layered inorganic nanocomposites because of their different, often remarkably enhanced mechanical, thermal, electrical, optical and magnetic properties, which are rarely present in pure polymer or conventional composite. These enhanced properties are mainly attributed to the high degree of dispersion of layered inorganic compounds within the polymer matrix. 1-3 The layered materials include graphite and graphite oxide; metal chalcogenides such as molybdenum, titanium and lead sulfides; layered phosphates such as zirconium hydrogen phosphate; clays and layered silicates such as montmorillonite, hectorite and saponite; and layered double hydroxides (LDHs). 4,5 LDHs are a family of lamellar compounds that contain exchangeable ions in the interlayer space (anionic clays). The structure consists of brucite-like sheets with a typical thickness of 0.5 nm, in which the partial substitution of trivalent for divalent metallic ions results in a positive charge that is compensated by anions within the interlayer galleries. The general formula is [M 1Àx 2+ M x 3+ (OH) 2 ] x+ A X/n

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Blends of Syndiotactic Polystyrene with SBS Triblock Copolymers

Cited by 12 publications

References 14 publications

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

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

Stereospecific sequential block copolymerizations of styrene and 1,3‐butadiene with a C₅Me₅TiMe₃/B(C₆F₅)₃/Al(oct)₃ catalyst

Synthesis and characterization of an exfoliated modified syndiotactic polystyrene/Mg–Al-layered double-hydroxide nanocomposite

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Blends of Syndiotactic Polystyrene with SBS Triblock Copolymers

Cited by 12 publications

References 14 publications

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

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

Stereospecific sequential block copolymerizations of styrene and 1,3‐butadiene with a C5Me5TiMe3/B(C6F5)3/Al(oct)3 catalyst

Synthesis and characterization of an exfoliated modified syndiotactic polystyrene/Mg–Al-layered double-hydroxide nanocomposite

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Stereospecific sequential block copolymerizations of styrene and 1,3‐butadiene with a C₅Me₅TiMe₃/B(C₆F₅)₃/Al(oct)₃ catalyst