Dilara Kocak

Properties of Polypropylene Composite Produced with Silk and Cotton Fiber Waste as Reinforcement

The importance of polymer composites among industrial materials is due to their improved mechanical properties. In recent researches, mechanical and physical properties have been improved by way of making composites with fiber reinforcement. Silk and cotton fibers used in the textile industry have good physical and mechanical properties. In this study, composite structures were produced by using recycled Poly Propylene, PP, polymer with silk and cotton waste as fiber reinforcement in different ratios. The fiber dimensions of silk and cotton wastes were between 1 mm, 2.5 mm, and 5 mm. They were mixed in the ratios of PP/silk and cotton waste 97%/3 and 94%/6. The mixture of polymer composite was prepared with double screw extruder. The sample was tested for tensile strength, elongation, yield strength, elasticity modulus, izod impact strength, melt flow index (MFI), heat deflection temperature (HDT), and vicat softening temperature. Thermal transitions of the materials were determined with Differential Scanning Calorimeter (DSC) and micro-structure properties were observed with a Scanning Electron Microscope (SEM).

Research into the specifications of woven composites obtained from raffia fibers pretreated using the ecological method

Studies on using cellulosic natural fibers as reinforcement for composites are rapidly growing. The aim of this study is using a raffia-based woven fabric as reinforcement for composites that are grown in the Mediterranean Zone of Turkey. These fabrics benefit from their mechanical performances, low density and their biodegradability. However, it is necessary for the fabrics to form adhesion in the matrix. Therefore, chemical processes should be applied onto the surface of the raffia-based woven fabrics. In this study, three different formulations (different concentrations of maleic anhydride, formic acid and acetic acid) were applied by using conventional and microwave energy on the raffia fabrics. At the end of the application, composite structures were formed by using the fabric as the reinforcement layer and isophtalic polyester as the matrix by the vacuum infusion method. The composite structures were characterized by attenuated total reflectance scanning electron microscope analysis and their mechanical tests were performed through tensile testing. Considering all results, the combination of acetic acid with the microwave process was found to modify the raffia fabric surfaces.

Investigation of the Filtration Properties of Medical Masks

ABSTRACT Medical masks are mostly produced from textiles. Weaving, knitting and nonwoven technologies are used to produce masks. But, nowadays, nonwoven technology is preferred for the mask production method. Nonwoven surfaces has good filtration properties. Mostly polyester and polypropylene fibers are used for mask production. Medical masks are designed to enable different functions. Generally masks have to protect from virus, bacterias, biological substances and particules in the air. Medical masks enable all these properties and produced according to application field. This is the first and initial results of the medical filtration project carried out by the authors. In this study particule filtration properties of different masks have been investigated. For each mask smallest particule size filtrated from the air accepted as the base for the comparison.

Investigation of the mechanical, thermal, and morphological properties of isotactic polypropylene/linear low-density polyethylene/ethylene vinyl acetate polymer blends and their fibers

In order to improve the functionality of certain defective characteristics of polypropylene polymer and fiber, their blends are analyzed physically and chemically both in the industry and the academia. There are fibers obtained from two different polymer blends and additive-added fibers in the polypropylene fiber industry. The aim of this study is to obtain polymer blends and their fibers, which consist of isotactic polypropylene and linear low-density polyethylene. In order to improve the blending of isotactic polypropylene and linear low-density polyethylene, ethylene vinyl acetate was added in the blend at different concentration such as 1, 5, 10, and 15% by using a twin-screw extruder. Polymer blends and their fibers were produced from the blends with different ratios of blending. Besides, the mechanical properties including strength, elongation, modulus of elasticity, yield of strength, Izod impact strength, hardness, thermal properties (differential scanning calorimetry and melt flow index), and morphological properties (scanning electron microscopy) of polymer blends and their fibers were investigated.

21 – The use of Luffa cylindrica fibres as reinforcements in composites

: This chapter discusses the use of Luffa cylindrica fibres. Areas covered include the properties and surface treatment of fibres, applications and performance as a reinforcement material in composites and nanocomposites incorporating Luffa cylindrica fibres.

New Approach To Produce Absorbent Pads For New End Uses

ABSTRACT The use of hygiene pads is increasing rapidly. They are used for babys diapers, sanitary products and incontinence pads for the elderly etc. But the use of pads with a dual mission of healing and protecting by absorbing the discharged liquid whilst releasing healing cream or chemical to the infected area without mixing the discharged liquid with the healing chemical is a relatively new one. In this study a new novel approach has been tested in the care for wounds, haemorrhoids etc.