Cardanol Based Thermosetting Resins
(Kardanol Bazlı Termoset Reçineler)
Polymers which have a wide area of applications have become indispensable materials of our modern lives. Today the majority of these polymeric materials are derived from petroleum feedstocks. With the petroleum production facing exhaustion day by day, and the continously increasing petroleum prices which are strongly afffected by socio-political issues, the use of renewable plant based feedstocks for making polymers is not only essential because our petroleum resources are finite but this replacement may also offer economic and environmental advantages as well. In this area much effort has been given to prepare polymers from plant oils since the triglyceride plant oil structure offers many synthetic routes to incorporate them into various polymeric materials. Another plant based resource is the Cashew nutshell liquid (CNSL) which is a natural resin found in the honeycomb structure of the cashew nutshell and is a byproduct of processing cashew nuts. Structure of Cardanol which is the main constituent of CNSL consists of a phenol ring connected to a 15 carbon long hydrocarbon chain with varied double bonds which makes it a very good candidate for styrene replacement and producing new hybrid materials. The aim of this research is to prepare new and functional polymers based on CNSL, a renewable resource. For this purpose commercially epoxidized cardanol and cardanol based bi-functional Bisphenol-A type glycidyl ether epoxy resin will be chemically modified to prepare cardanol based monomers and then these monomers will be homopolymerized and copolymerized with other petroleum based monomers to prepare partially or completely cardanol based functional polymers. One of the most important outcomes of this project is that cardanol which is a renewable resource will replace the petroleum based starting materials partially or completely to prepare new and functional polymers which may have important potential applications. This replacement is not only advantageous environmentally and economically, but also the new synthesized polymers may carry special properties such as fire retardance and improved toughness properties or degredability in aqueous medium due to the unique structure of cardanol.
Development of Permanent Chemical Hydrogel Films Based on Chitosan and Carboxy Methyl Cellulose (CMC) for Moisture Absorbing Packaging Films
(Kitosan ve Karboksimetil Selüloz Bazlı Kalıcı Kimyasal Hidrojel Filmlerin Geliştirilmesi)
Hydrogels are cross-linked and 3D polymeric networks which can absorb 1000 times greater than their dry weight without disintegrating. They have a very wide range of application areas such as controlled drug delivery systems, tissue engineering, waste water treatment, agriculture, artificial muscle etc. due to their hydrophilic nature and sensitivity to the environmental parameters such as temperature, pH and ionic strength, concentration, electrical field etc. Hydrogels can be prepared by using synthetic or natural polymers. The most commonly used natural polymeric materials in preparation of hydrogels are chitosan, xhantan, pectin, gelatin and cellulose. Humidity is one of the most important factors that causes deterioration in dry foods (biscuits, powder coffee, coffee milk, snacks etc…). In this research, in order to overcome the risks associated with conventional moisture absorbing sachets, hydrogel films having capability to absorb moisture will be developed by using the biodegradable polymers: carboxy-methyl cellulose and chitosan. The physical and chemical hydrogel films will be prepared with the different polymer compositions and the structural analysis of these hydogel films will be performed. The water absorbing capacity, mechanical and thermal performance of developed hydrogel films will be determined.
Assist. Prof. Erde Can