Miscible polymer mixture driven by segmental microconformations

Hseih, D. T.; Peiffer, D. G.; Rabeony, M.; Siakali-Kioulafa, Ekaterini; Hadjichristidis, N.

doi:10.1021/ma00070a040

Cited by 8 publications

(7 citation statements)

References 6 publications

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“…This type of nanophase separation of the n-pentyl group was previously observed in PnPMA homopolymer. 21 Hseih et al 22 reported that the hindered chain motion of the rigid cyclohexyl group in poly(cyclohexyl acrylate) (PCHA) is a main source of induced dipole and dipole interactions in a PS/PCHA blend. This suggests that the weak interactions that determine the magnitude of the directional enthalpic gain in PS-PnPMA are different in the disordered states observed at T < T LDOT and T > T UODT .…”

Section: Resultsmentioning

confidence: 99%

Phase Behavior of a Weakly Interacting Block Copolymer by Temperature-Dependent FTIR Spectroscopy

Kim

et al. 2005

Macromolecules

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The phase transitions of polystyrene-block-poly(n-pentyl methacrylate) (PS-PnPMA) have been investigated by temperature-dependent infrared spectroscopy with two-dimensional correlation spectroscopy. PS-PnPMA was shown to exhibit a closed-loop type of phase behavior, where, upon heating, a disorder-to-order transition (LDOT) was found at lower temperature and an upper order-to-disorder transition (UODT) was observed at higher temperature. Sudden changes in the absorbance (A) and maxima in the slope dA/dT were observed at the transition temperatures. In the disordered state below the LDOT, the intensity of the conformational band at 1255 cm -1 was greater than that at 1274 cm -1 , whereas the reverse was found in the disordered state above the UODT. This suggests that the conformation of the C-C-O group in the PnPMA chain (and thus the directional enthalpic gain) is different in the two disordered states and, therefore, that the driving force to induce the disordered state at lower temperatures is different from that at higher temperatures.

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Section: Resultsmentioning

confidence: 99%

Phase Behavior of a Weakly Interacting Block Copolymer by Temperature-Dependent FTIR Spectroscopy

Kim

et al. 2005

Macromolecules

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“…The interaction between PS and PVME was investigated by 2D NMR, and a coupling of phenyl group and ether group was observed . The driving force for miscibility in PS/PCHA was believed to be a weak dipole−induced dipole interaction enhanced by finite rotational states of the segments limited by the bulky cyclohexyl group . The anomalous property of PIB against other polyolefin was explained by lattice cluster theory from the structures of monomers .…”

Section: Resultsmentioning

confidence: 99%

Novel Miscible Polymer Blend of Poly(4-trimethylsilylstyrene) and Polyisoprene

et al. 2005

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The phase behavior of the newly found miscible polymer blends poly(4-trimethylsilylstyrene) and polyisoprene was investigated with optical microscopy (OM) and also with differential scanning calorimetry (DSC), while the degree of polymer−polymer interaction was evaluated with small-angle neutron scattering (SANS). The blends with homogeneous one phase at various compositions turned into two phases by heating, showing a lower critical solution temperature (LCST) type phase diagram with a critical temperature of 172 °C if the degree of polymerization is ca. 370. The blend gave a single glass transition temperature below the LCST, and the interaction parameter χ was represented as a function of temperature T according to the relationship χ = 0.027 − 9.5/T.

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“…The top two spectra show that such MAS produce an NMR spectrum of LLDPE in which resonances for the individual carbons about the incorporated 1-hexene monomer units can be seen as in the solution spectrum (Ref. 5 ) .…”

Section: Resultsmentioning

confidence: 99%

Dynamics of polypropene and propene‐ethylene copolymers at temperatures above ambient

Zeigler¹

1994

Macromolecular Symposia

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Several applications of solid‐state nuclear magnetic resonance (NMR) spectroscopy to studying polyolefin mobility at temperatures ranging from room temperature to above the polymer melt are described. 13C NMR can be used with magic‐angle spinning and high‐power proton decoupling to determine the fraction of mobile polymer in polypropene and to characterize the nature of the polymer chain motions as a function of sample temperature. Similar techniques can be used to characterize the local motions of complex copolymer systems such as heterophasic ethylene‐propene copolymers. The practicality of low‐speed magic angle spinning to observe quantitative high‐resolution NMR spectra of neat, molten polymer samples is also described.

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Miscible polymer mixture driven by segmental microconformations

Cited by 8 publications

References 6 publications

Phase Behavior of a Weakly Interacting Block Copolymer by Temperature-Dependent FTIR Spectroscopy

Phase Behavior of a Weakly Interacting Block Copolymer by Temperature-Dependent FTIR Spectroscopy

Novel Miscible Polymer Blend of Poly(4-trimethylsilylstyrene) and Polyisoprene

Dynamics of polypropene and propene‐ethylene copolymers at temperatures above ambient

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