Zobrazeno 1 - 10
of 14
pro vyhledávání: '"W. T. Mead"'
Autor:
Roger S. Porter, W. T. Mead
Publikováno v:
Journal of Polymer Science: Polymer Symposia. 63:289-312
Extrusion rates have been measured for high density polyethylene fibers prepared by solid-state extrusion through a conical die with maximum draw ratio of 52, using constant pressure and temperatures ranging from 0.12 to 0.49 GPa and 60° to 140°C a
Autor:
W. T. Mead
Publikováno v:
Rubber Chemistry and Technology. 53:245-251
The ESR spectra from polychloroprene uniaxially deformed at 77 K in an oxygen environment are composite spectra arising from two radical species. An allyl radical species results from main-chain rupture midway between the α-methylene groups, and a p
Autor:
Roger S. Porter, W. T. Mead
Publikováno v:
Journal of Applied Physics. 47:4278-4288
The annealing characteristics of ultraoriented high‐density polyethylene fibers have been studied using differential scanning calorimetry, thermomechanical analysis, and tensile testing. The melting point of unannealed fibers was estimated to be 13
Publikováno v:
Journal of Materials Science. 15:765-772
The influence of extrusion conditions on the microhardness of ultradrawn polyethylene (PE) has been investigated. The micromechanical behaviour of ultradrawn PE fibres can be defined in terms of a creep constant and a microhardness value (MH) at 0.1
Autor:
W. T. Mead, P. E. Reed
Publikováno v:
Polymer Engineering and Science. 14:22-27
The tensile behavior of oriented polybutadiene at 83°K is systematically studied as a function of strain rate and pre-test orientation. Electron spin resonance studies of radical formation are made in conjunction with the mechanical tests. Three dif
Autor:
W. T. Mead
Publikováno v:
Macromolecules. 12:491-494
Publikováno v:
Macromolecules. 12:473-478
Publikováno v:
Rubber Chemistry and Technology. 53:915-935
The ESR spectra obtained from diene rubbers following mechanical deformation at cryogenic temperatures in a commercial purity nitrogen atmosphere are composite spectra arising from two or more radicals. The two radicals are thought to be an allyl rad
Publikováno v:
Journal of Crystal Growth. 48:334-342
Thin films of poly(vinylidene fluoride) have been prepared by the recently developed technique of solid state coextrusion. The films have been produced at extrusion rates of ⩾1.0 cm/min at ∼50°C below the ambient melting point (∼175°C) with a
Autor:
W. T. Mead, Roger S. Porter
Publikováno v:
International Journal of Polymeric Materials. 7:29-56
Ultra-oriented high density polyethylene fibers have been produced by solid state extrusion of various polyethylene morphologies prepared in the reservoir of an Instron Rheometer. A constant extrusion temperature and pressure were used in the followi