Author
A. H. Windle
Bio: A. H. Windle is an academic researcher from Imperial College London. The author has contributed to research in topics: X-ray crystallography & Paracrystalline. The author has an hindex of 2, co-authored 2 publications receiving 34 citations.
Papers
More filters
TL;DR: In this article, the profile of the 002 diffraction peak of polyethylene is related to microstructural parameters for the [001] direction, including mean crystal thickness, distribution of thicknesses, shape function and the degree of paracrystalline disorder in the lattice.
Abstract: The profile of the 002 diffraction peak of polyethylene is related to microstructural parameters for the [001] direction. The parameters considered are the mean crystal thickness, distribution of thicknesses, shape function and the degree of paracrystalline disorder in the lattice.
21 citations
TL;DR: In this article, both low and wide-angle X-ray diffraction measurements have been made on solution-crystallized mat of high density polyethylene which have been annealed for different periods at 125° C.
Abstract: Both low- and wide-angle X-ray diffraction measurements have been made on solution-crystallized mats of high density polyethylene which have been annealed for different periods at 125° C. The low-angle data, in addition to showing the rapid increase in both long period and density defect at each fold surface for the first stages of annealing, also indicate that after annealing for times in excess of 105 sec the density defect is reduced and approaches the value for the unannealed crystal. The wide-angle X-ray studies have centred around the Fourier analysis of the 0 0 2 diffraction peak. The results of this type of measurement on unannealed mats have already been reported [20]. In extending the work to annealed material evidence has been obtained for preferred chain stem lengths which are multiples of the unannealed length. The combination of these observations with the low-angle results has led to the formulation of a model for crystal thickening which invokes the unlooping mechanism proposed by Dreyfuss and Keller [15], but also envisages thickening occurring preferentially from one fold surface to give an asymmetric crystal profile in the [0 0 1] direction.
13 citations
Cited by
More filters
TL;DR: In this article, a stress-induced phase transformation in the metastable tetragonal phase of polycrystalline zirconia was shown to increase the strength and grain size.
Abstract: Polycrystalline zirconia containing a high content of metastable tetragonal phase shows high strength (∼ 700 MPa), high fracture toughness (Kc = 6 to 9 MN m−3/2) and small grain size (<0.3jμm). The strength and grain size remain nearly constant over a wide range of tetragonal phase content (100 to 30%). At a low concentration of tetragonal phase <30%, there is a rapid decrease in strength accompanied by a rapid increase in grain size. These results are explained by means of a stress-induced phase transformation in the metastable tetragonal phase.
438 citations
TL;DR: In this paper, the authors reported a discrepancy found during the analysis of wide-angle X-ray diffraction patterns from a broad range of branched polyethylenes and described its interpretation.
69 citations
TL;DR: In this paper, the crystal structure and morphology of 4-hydroxybenzoic acid (HBA) and 2-hydrox-6-naphthoic acid thermotropic random copolymers having different compositions and molecular weights were examined.
54 citations
TL;DR: In this article, a modified single-line technique for determining separately the size and lattice distortion parameters of the crystalline regions by wide-angle X-ray scattering (WAXS) of typical polymer materials is proposed.
24 citations
TL;DR: The effect of annealing on the morphology of solution-crystallized polyethylene has been studied by analyzing the shape of the low-frequency Raman LAM-1 band as discussed by the authors.
19 citations