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Featured researches published by Y Qin.


Polymer | 1993

Fibres from polypropylene and liquid crystal polymer (LCP) blends: 1. Effect of LCP concentration

Y Qin; D L Brydon; Robert Rhodes Mather; Roger Wardman

Abstract Polypropylene (PP) resin and a thermotropic liquid crystal polymer (LCP) were mixed and coextruded on a screw extruder. The LCP was found to exist in fibril form above a PP/LCP (wt/wt) ratio of 100 5 and a PP/LCP ratio of 100 15 the LCP existed in a network structure. For the as-spun fibre, both the initial modulus and the yield stress increased with the increase in the LCP concentration. In the drawn fibres, however, the LCP fibrils were found to be split into short fragments. A two-stage drawing process was used in order to reduce the extent of fracture of the LCP fibrils. The drawn fibres were found to contain more long fibrils from the two-stage process and as a result, there were significant increases in both the tensile strength and initial modulus of the two-stage drawn fibres.


Polymer | 1993

Fibres from polypropylene and liquid crystal polymer blends: 3. A comparison of polyblend fibres containing Vectra A900, Vectra B950 and Rodrun LC3000

Y Qin; D L Brydon; Robert Rhodes Mather; Roger Wardman

Abstract Polyblend fibres were made of polypropylene (PP) and three thermotropic liquid crystal polymers (LCPs). The LCPs were found to exist in different morphological structures; the Vectra A900 and Vectra B950 LCPs existed mainly as fibrils, while the Rodrun LC3000 existed as short elongated ribbons. The tensile properties of the as-spun fibres were improved on addition of the LCPs, with the properties of the drawn polyblend fibres varying with the drawing procedure. In one-stage drawing, the polyblend fibres gave poorer tensile properties than the pure PP fibre. However in two-stage drawing, the Vectra A900 blend showed an increase in initial modulus over that of the pure PP fibre, while the Rodrun LC3000 blend produced an improvement in fibre tenacity.


Polymer | 1993

Fibres from polypropylene and liquid crystal polymer blends: 2. Effect of extrusion and drawing conditions

Y Qin; D L Brydon; Robert Rhodes Mather; Roger Wardman

Abstract The drawing conditions were studied for a polyblend fibre of polypropylene (PP) and a thermotropic liquid crystal polymer (LCP). It was found that, in one-stage drawing, the LCP fibrils were split into short fragments with aspect ratios of around 10. Although fibre properties were improved with the increase in drawing temperature, the best properties of the polyblend fibre from one-stage drawing were poorer than those of the pure polypropylene fibre. A two-stage drawing process was studied in terms of the ratios and temperatures of the first- and second-stage drawings. It was found that the fibre properties were strongly affected by these parameters. At best, the fibre tenacity and initial modulus in the two-stage drawing were 14% and 39% higher than the highest values from the one-stage drawing. The LCP fibrils were found to split to a much lower extent in the two-stage drawing. The optimum drawing proceedure was applied to a series of polyblend fibres extruded under various extrusion rates and with a number of draw-down ratios.


Journal of Applied Polymer Science | 1996

Production of thermally stable polypropylene fibers

Y Qin; D L Brydon; Robert Rhodes Mather

Polypropylene (PP) fibers were made with a number of different processing conditions, such as one-stage drawing, two-stage drawing, and a combination of drawing, annealing, and relaxation. The thermal stability of these fibers in terms of shrinkage in length at 100, 130, and 150°C was studied. It was found that the thermal shrinkage can be greatly improved with multi-stage drawing and with annealing. The fibers that were two-stage-drawn, relaxed, and then annealed remained stable at 130°C while still having a fiber tenacity in excess of 0.8 N/tex. Thermal stability at 150°C was more difficult to improve. However, the fibers that were drawn in three stages with a final drawing temperature of 185°C showed thermal shrinkage at 150°C of less than 10%. Finally, it was found that the thermal shrinkage of PP fibers at 150°C can be greatly reduced by blending a minor component of a liquid crystal polymer into the PP fibers. With two-stage drawing and annealing, fibers with shrinkage at 150°C of only 2.9% were produced.


Liquid-Crystalline Polymer Systems - Technological Advances | 1996

Fiber-drawing from blends of Polypropylene and Liquid Crystalline Polymers

J.M.G. Cowie; M M Miller; Y Qin; D L Brydon; Robert Rhodes Mather; Roger Wardman


Proceedings of 30th International Symposium of Novelties in Textiles | 1996

Production of High Performance Polypropylene Fibres

Y Qin; M M Miller; J.M.G. Cowie; D L Brydon; Roger Wardman


Abstracts of Lectures and Posters of 30th International Symposium on Novelties in Textiles | 1996

Production of Higher Performance Polypropylene Fibres

D L Brydon; Roger Wardman; J.M.G. Cowie; M M Miller; Y Qin


The Polymer Processing Society European Meeting | 1995

Processing of High-Performance Polypropylene Fribres.

Y Qin; D L Brydon; Robert Rhodes Mather; Roger Wardman; R W Harrison


Proceedings of the 209th National meeting of the ACS Division of Polymeric Materials: Science and Engineering | 1995

Fibre Drawing from Blends of Polypropylene and Liquid Crystalline Polymers in Liquid-Crystalline Polymer Systems, Technological Advances

J.M.G. Cowie; M M Miller; Y Qin; D L Brydon; Robert Rhodes Mather; Roger Wardman


Proceedings of Europhysics Conference on Macromolecular Physics - Structure Development during Polymer Processing. | 1994

Hot Drawing of Fibres Blended from Polypropylene and Liquid Crystal Polymers.

Y Qin; D L Brydon; Robert Rhodes Mather; Roger Wardman; J.M.G. Cowie; M M Miller

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D L Brydon

Heriot-Watt University

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