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Thermoplastic urethane elastomers IV. Effects of cycloaliphatic chain extender on dynamic mechanical properties (1975)

Seefried, C. G. ; Koleske, J. V. ; Critchfield, F. E. ; [et al.]

Stamford, Conn. [u.a.] : Wiley-Blackwell

Polymer Engineering and Science 15 (1975), S. 646-650

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ISSN: 0032-3888

Keywords: Chemistry ; Chemical Engineering

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics

Notes: The dynamic mechanical properties of a series of thermoplastic urethane elastomers have been studied as a function of molecular composition and temperature. Polymers based on polycaprolactone diol, an isomeric mixture of tolylene diisocyanate and hydrogenated Bisphenol-A as the chain extender were prepared at various relative concentrations of hard and soft segments. The glass transition temperatures of these polymers progressively shifted to higher temperatures as the relative hard segment content was increased. This variation was accurately described by the Fox relationship for amorphous copolymers. These results can be interpreted in terms of the relative degree of segregation between the segment of the block copolymers.

Additional Material: 6 Ill.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1002/pen.760150903

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Distribution of monoamines in the diencephalon and pituitary of the dogfish, Scyliorhinus canicula L. (1973)

Wilson, J. F. ; Dodd, J. M.

Springer

Cell & tissue research 137 (1973), S. 451-469

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ISSN: 1432-0878

Keywords: Hypothalamus ; Pituitary ; Elasmobranch ; Catecholamine fibres ; Fluorescence microscopy

Source: Springer Online Journal Archives 1860-2000

Topics: Biology , Medicine

Notes: Summary The distribution of monoamines in the diencephalon and pituitary of the dogfish, Scyliorhinus canicula, has been investigated using the histochemical fluorescence technique of Falck and Hillarp (Falck and Owman, 1965). Terminals of monoamine-containing axons were found in the neurointermediate lobe of the pituitary and the axons were traced, by means of nialamide and L-dopa treatment and lesions, to the nucleus medius hypothalamicus. A separate hypothalamic system converging on the anterior median eminence and the occurrence of aminergic cells in the nuclei lobi inferiores and nucleus medius hypothalamicus were similarly demonstrated. Normal fish show a bilateral uncrossed tegmental tract and two areas of catecholamine-containing neurones in modified ependymal organs. The organum vasculosum hypothalami includes both primary catecholamine and 5-hydroxytryptamine-containing cell types whilst the organum vasculosum praeopticum has only the former type. Both organs contain cells which send club-like processes into the third ventricle. The subcommissural organ does not contain monoamines. The role of hypothalamic catecholamine systems in the regulation of pituitary function is discussed.