Properties of Syndiotactic Polystyrene

Takebe, Toshihiko; Yamasaki, Komei; Funaki, Keisuke; Malanga, M.

doi:10.1002/9780470557006.ch13

Cited by 6 publications

(11 citation statements)

References 6 publications

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“…This has been confirmed by small-angle neutron scattering studies which have revealed that the characteristic ratio is C ∞ s-PS > C ∞ a-PS > C ∞ i-PS , that points out that the stiffest chain is the one of s-PS. 52 Specifically, the C ∞ s-PS value is 7.9 to 13 for increasing M w from 214 000 to 380 000 g/mol. 53 The C ∞ a-PS value is 6.7 to 9.6 for increasing M w from 325 000 to 500 000 g/mol, and the C ∞ i-PS values are 4.9 and 5 for M w = 254 000 and 500 000 g/mol, respectively.…”

Section: Discussionmentioning

confidence: 91%

Physical Ageing of Polystyrene: Does Tacticity Play a Role?

et al. 2019

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The ageing kinetics of amorphous atactic (a-PS), isotactic (i-PS), and syndiotactic (s-PS) polystyrene were studied by means of flash-differential scanning calorimetry. The specimens were aged for up to 2 h at six different ageing temperatures: the optimum ageing temperature, that is, the temperature at which the enthalpy overshoot at the glass transition is maximal for the given elapsed time, and five ageing temperatures ranging from 20 to 80 K below the optimum ageing temperature. A logarithmic increase of the enthalpy overshoot with ageing time is observed for specimens at their optimum ageing temperatures. For temperatures significantly lower than the optimum, there is a range where the enthalpy overshoot is constant, but for higher temperatures (still below the optimum), a logarithmic increase is also observed. Moreover, the ageing kinetics appear to depend on tacticity, with s-PS and i-PS exhibiting the slowest and fastest ageing kinetics, respectively, and a-PS exhibiting ageing kinetics between these two extremes.

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Section: Discussionmentioning

confidence: 91%

Physical Ageing of Polystyrene: Does Tacticity Play a Role?

et al. 2019

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“…But only sPS exhibits a crystallization rate fast enough to be readily processable into shaped articles by injection molding, extrusion, thermoforming, and similar methods. The primary advantage of sPS as an engineering material is its high heat distortion temperature, which is superior to those of nylon and polybutylene terephthalate (PBT). − Neat sPS has found utility in electrical and electronic materials, as well as in temperature-resistant automotive and appliance applications . Moreover, when biaxially oriented, it is used in high temperature film markets (e.g., ovenable packaging) by virtue of its high T m and transparency.…”

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confidence: 99%

“…Despite such advantages, neat sPS resin is not suitable as a structural material because of its brittleness and poor impact strength. These disadvantages can be overcome by modification with fiberglass, mineral fillers, or elastomers . Glass-filled sPS has an impact strength greater than or equal to those of glass-filled PBT, polyethylene terephthalate (PET), and Nylon-6,6.…”

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confidence: 99%

“…Glass-filled sPS has an impact strength greater than or equal to those of glass-filled PBT, polyethylene terephthalate (PET), and Nylon-6,6. Its heat distortion advantage is preserved upon addition of glass fiber. − Glass-filled sPS serves as an ignition-resistant polymer for certain electrical and electronic applications . Syndiotactic polystyrene has also been modified with other fibers, such as carbon fiber and Kevlar, , and sPS/clay nanocomposites have been reported.…”

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confidence: 99%

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Discovery of Syndiotactic Polystyrene: Its Synthesis and Impact

Baugh

Schulz

2020

Macromolecules

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This Editorial discusses two seminal Macromolecules publications by Ishihara et al. concerning the synthesis of syndiotactic polystyrene. In a 1986 communication (Macromolecules 1986(Macromolecules , 19, 2464, the first preparation of this semicrystalline polymer was reported. A 1988 full paper (Macromolecules 1988, 21, 3356) described the enabling polymerization catalyst system, based on methylaluminoxane-activated half-metallocene titanium complexes. These two highly cited publications inspired a large body of research concerning the synthesis, structure, properties, and applications of this new polymer.

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“…[1][2][3][4][5][6] Its diverse excellent properties (such as high melting temperature of $270 C, high crystallization rate along with high modulus, excellent resistance to a wide range of chemicals (e.g., acids, bases, and most organic solvents), hydrolytic stability, low dielectric constant, ease of injection molding and other melt processing) make it a major type of engineering plastics. 4,7,8 Recently, there has been an increasing interest in sPS/inorganic composites. [9][10][11][12][13][14][15] In sharp contrast, the preparation of sPS/functional polymer composites still remains a problem since the melt-processing at high temperatures will inevitably cause severe and irreversible damages to those functional polymers.…”

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confidence: 99%