Dilute-solution properties and temperature dependence of unperturbed chain dimensions for poly(p-tert-butylstyrene)

Mays, Jimmy W.; Nan, Shouyan; Whitfield, David

doi:10.1021/ma00001a048

Cited by 12 publications

(3 citation statements)

References 3 publications

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“…The segment length for P(4tBS) obtained from the fitting of the SANS data is significantly smaller than that anticipated from the dilute‐solution intrinsic viscosity reported previously (ℓ = 8.4 Å) 29. This is not a surprising result because it has been previously reported that in many instances chain dimensions obtained from SANS experiments do not agree with those determined with intrinsic viscosities from θ solutions 36.…”

Section: Resultscontrasting

confidence: 65%

“…In these cases, the two fitted parameters were χ and ℓ for P(4tBS). Previously, dilute‐solution‐based intrinsic viscosity measurements have been used to investigate the unperturbed θ dimensions of P(4tBS), and no melt‐state SANS‐based segment length is available 29, 35. The resulting interaction parameters for the blends with compositions of 50/50 and 75/25 are shown in Figure 3.…”

Section: Resultsmentioning

confidence: 99%

“…All the polymers used in this study were model polymers of low polydispersity prepared by living anionic polymerization 29. The molecular weights and polydispersities for the polymers are given in Table 1.…”

Section: Methodsmentioning

confidence: 99%

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Thermodynamic interactions in blends of poly(4‐tert‐butyl styrene) and polyisoprene by small‐angle neutron scattering

Yurekli

Krishnamoorti

2004

J Polym Sci B Polym Phys

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The thermodynamic interactions between poly(4-tert-butyl styrene) [P(4tBS)] and 1,4-polyisoprene (PI; both hydrogenous) were obtained as functions of the temperature, PI molecular weight, and blend composition through the examination of miscible ternary blends of these two components with a common miscible labeled polymer [90% 1,2-deuterated polybutadiene (dPBD)] with small-angle neutron scattering. The thermodynamic interaction parameters between P(4tBS) and dPBD and between P(4tBS) and PI increased with increasing temperature and were consistent with lower critical solution temperature behavior. Although the binary blends of P(4tBS) and dPBD exhibited phase separation at elevated temperatures, the thermodynamic interaction parameters between P(4tBS) and PI remained large and negative and independent of the PI molecular weight. Finally, the thermodynamic interactions for PI and P(4tBS) depended strongly on the ratio of PI to P(4tBS) and were also sensitive to the amount of dPBD present in the ternary blend.

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Section: Resultscontrasting

confidence: 65%

Section: Resultsmentioning

confidence: 99%