Journal ArticleDOI
The properties of polyethylene crystallized under the orientation and pressure effects of a pressure capillary viscometer
John H. Southern,Roger S. Porter +1 more
TLDR
In this article, high-density commercial polyethylenes have been crystallized under the combined orientation and pressure effects available in the Instron capillary rheometer, and the samples so formed were found to have a high degree of crystal perfection and crystal orientation in combination with the unusual property of transmitting visible light.Abstract:
High-density commercial polyethylenes have been crystallized under the combined orientation and pressure effects available in the Instron capillary rheometer. The samples so formed were found to have a high degree of crystal perfection and crystal orientation in combination with the unusual property of transmitting visible light. The procedure for forming the crystal structure is elucidated. X-Ray and differential scanning calorimetry techniques were utilized to initiate a study of the structure. Evidence is presented that is consistent with the presence of an extended chain component in the crystal structure.read more
Citations
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Journal ArticleDOI
Ultra-high-strength polyethylene filaments by solution spinning/drawing
Paul Smith,PJ Piet Lemstra +1 more
TL;DR: In this paper, the influence of the draw ratio on the mechanical and thermal properties of polyethylene fibres was investigated, and it was found that the tensile strength tended to approach an upper limit at high draw ratios.
Journal ArticleDOI
Shear-Enhanced Crystallization in Isotactic Polypropylene. 1. Correspondence between in Situ Rheo-Optics and ex Situ Structure Determination
TL;DR: In this paper, the effects of short term shearing on the subsequent crystallization of polydisperse Ziegler−Natta isotactic polypropylene are observed using in situ optical measurements and ex situ microscopy.
Book ChapterDOI
Microhardness relating to crystalline polymers
TL;DR: In this article, the authors used the microhardness technique to elucidate the dependence of a variety of local deformational processes upon polymer texture and morphology, which is most suitably defined in terms of the pyramid indentation test.
Journal ArticleDOI
Ultrahigh-strength polyethylene filaments by solution spinning and hot drawing
TL;DR: In this paper, the authors describe some preliminary results on alternative routes to produce high-strength and high-modulus polyethylene filaments with a uni-axial Young's modulus of 90 GPa and a tensile strength of 3 GPa.
Journal ArticleDOI
Shear-enhanced crystallization in isotactic polypropylenePart 2. Analysis of the formation of the oriented “skin”
Guruswamy Kumaraswamy,Ravi K. Verma,A. M. Issaian,P. Wang,Julia A. Kornfield,F. Yeh,Benjamin S. Hsiao,Robert H. Olley +7 more
TL;DR: Kumaraswamy et al. as discussed by the authors used wide angle X-ray diffraction (WAXD) to follow crystallization in polydisperse isotactic polypropylene during and after a brief interval of shear under isothermal conditions.
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Preparation of ultra-high modulus linear polyethylenes; effect of molecular weight and molecular weight distribution on drawing behaviour and mechanical properties
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