Zobrazeno 1 - 10
of 12
pro vyhledávání: '"K J McGrath"'
Publikováno v:
Macromolecules. 39:3581-3587
Dielectric spectroscopy was used to follow the component dynamics in the miscible blend of poly(vinyl methyl ether) (PVME) and poly(2-chlorosytrene) (P2CS). For the PVME component (which has the more intense loss peak due to its higher polarity), the
Publikováno v:
Journal of Fish Biology. 59:364-379
American eels Anguilla rostrata, collected from three distinct locations along the St Lawrence River (Lake St Lawrence, Quebec City and Kamouraska), were thought to consist entirely of out-migrating adults at Quebec City and Kamouraska and of both re
Publikováno v:
Macromolecules. 33:8354-8360
The morphology of blends of polystyrene (PS) microgels with linear PS were studied using NMR spectroscopy. Three techniques were employed to assess the intimacy of mixing: isothermal cross-polarization/magic-angle-spinning (CP/MAS) dipolar dephasing
Publikováno v:
Macromolecules. 28:2825-2830
The temperature dependences of the line widths observed in solid-state 13 C NMR spectra for several polymers are shown to correlate with the time and temperature dependences of the segmental dispersions in their dielectric relaxation spectra. The NMR
Autor:
K. J. McGrath, C. M. Roland
Publikováno v:
Rubber Chemistry and Technology. 67:629-635
129Xe NMR spectroscopy is employed to demonstrate that polyepichlorohydrin and poly(vinylmethylether), which have virtually equal glass transition temperatures, form thermodynamically miscible blends. This conclusion is drawn from the appearance of a
Publikováno v:
Macromolecules. 25:4911-4914
Solid-state 13 C NMR measurements carried out on poly(vinylethylene) and polyisobutylene demonstrate that the molecular motions underlying their respective segmental relaxations have vastly different temperature dependencies. These differences parall
Autor:
C. M. Roland, K. J. McGrath
Publikováno v:
Macromolecules. 25:166-169
A solid-state NMR dipolar dephasing experiment is constructed to probe the phase morphology of isotopic blends of poly(vinylethylene). It is demonstrated that the blend is segmentally mixed for component molecular weights at which the critical value
Publikováno v:
Physical review. E, Statistical, nonlinear, and soft matter physics. 75(1 Pt 1)
Dielectric loss spectra are reported for alpha -tocopherol acetate (an isomer of vitamin E) in the supercooled and glassy states. The alpha -relaxation times, tau_{alpha} , measured over a 190 degrees range of temperatures, T , at pressures, P , up t
Autor:
K. J. Mcgrath, C. M. Roland
Publikováno v:
Macromolecules. 28:2982-2984
Publikováno v:
Macromolecules. 26:6127-6128
NMR results with polystyrene glass obtained by freeze-drying dilute solution show unambiguously that substantial interpenetration exists among polymer chains in a material obtained by quenching a solution for which c * /c ∼ 4 in liquid nitrogen and